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  • Light Speed Invariant Solution and Its Enlightenment of Field Equation of General Relativity
    Adv. Astron. (IF 2.353) Pub Date : 2020-11-29
    Jian Liang Yang

    A systematic examination of the basic theory of general relativity is made, the meaning of coordinates again is emphasized, the confusion caused by unclear meaning of coordinates in the past is corrected, and the expression of the theory is made more accurate. Firstly, the equation of Einstein’s gravitational field is solved in the usual coordinate system, the existence of light speed invariant solution

    更新日期:2020-12-01
  • Wormhole Models and Energy Conditions in Gravity with the Hu–Sawicki Model
    Adv. Astron. (IF 2.353) Pub Date : 2020-11-23
    Ouziala Ikram; G. Mustafa

    In this recent study, we shall investigate the wormhole models with a Hu–Sawicki model in the framework of gravity. Spherically static symmetric space-time is considered to construct wormhole models with the anisotropic fluid distribution. The traceless matter is discussed by imposing a particular equation of state. To address the important conditions of the shape function of the wormhole geometry

    更新日期:2020-11-23
  • Isotropic Gravastar Model in Rastall Gravity
    Adv. Astron. (IF 2.353) Pub Date : 2020-11-16
    G. Abbas; K. Majeed

    In the present paper, we have introduced a new model of gravastar with an isotropic matter distribution in Rastall gravity by the Mazur–Mottola (2004) mechanism. Mazur–Mottola approach is about the construction of gravastar which is predicted as an alternative to black hole. By following this convention, we define gravastar in the form of three phases. The first one is an interior phase which has negative

    更新日期:2020-11-17
  • Approximate Analytical Three-Dimensional Multiple Time Scales Solution to a Circular Restricted Three-Body Problem
    Adv. Astron. (IF 2.353) Pub Date : 2020-11-11
    Fabao Gao; Yongqing Wang

    We illustrate the chaotic nature of the circular restricted three-body problem from the perspective of the bifurcation diagram with respect to the mass ratio parameter. Moreover, it is shown that when the frequency ratio in different directions of the classical problem is irrational, it has the quasiperiodic characteristics. In addition, a three-dimensional approximate solution to this problem under

    更新日期:2020-11-12
  • Oceans, Lakes, and Stromatolites on Mars
    Adv. Astron. (IF 2.353) Pub Date : 2020-10-17
    Rhawn G. Joseph; Olivier Planchon; N. S. Duxbury; K. Latif; G. J. Kidron; L. Consorti; R. A. Armstrong; C. Gibson; R. Schild

    Billions of years ago, the Northern Hemisphere of Mars may have been covered by at least one ocean and thousands of lakes and rivers. These findings, based initially on telescopic observations and images by the Mariner and Viking missions, led investigators to hypothesize that stromatolite fashioning cyanobacteria may have proliferated in the surface waters, and life may have been successfully transferred

    更新日期:2020-10-17
  • Nucleonic Direct Urca Processes and Cooling of the Massive Neutron Star by Antikaon Condensations
    Adv. Astron. (IF 2.353) Pub Date : 2020-10-17
    Yan Xu; Wen Bo Ding; Cheng Zhi Liu; J. L. Han

    Nucleonic direct Urca processes and cooling of the massive neutron stars are studied by considering antikaon condensations. Calculations are performed in the relativistic mean field and isothermal interior approximations. Neutrino energy losses of the nucleonic direct Urca processes are reduced when the optical potential of antikaons changes from to  MeV. If the center density of the massive neutron

    更新日期:2020-10-17
  • The Slow Spinning Motion of a Rigid Body in Newtonian Field and External Torque
    Adv. Astron. (IF 2.353) Pub Date : 2020-10-15
    A. I. Ismail

    In this paper, the problem of the slow spinning motion of a rigid body about a point O, being fixed in space, in the presence of the Newtonian force field and external torque is considered. We achieve the slow spin by giving the body slow rotation with a sufficiently small angular velocity component about the moving z-axis. We obtain the periodic solutions in a new domain of the angular velocity vector

    更新日期:2020-10-15
  • Solving a Problem of Rotary Motion for a Heavy Solid Using the Large Parameter Method
    Adv. Astron. (IF 2.353) Pub Date : 2020-09-01
    A. I. Ismail

    The small parameter method was applied for solving many rotational motions of heavy solids, rigid bodies, and gyroscopes for different problems which classify them according to certain initial conditions on moments of inertia and initial angular velocity components. For achieving the small parameter method, the authors have assumed that the initial angular velocity is sufficiently large. In this work

    更新日期:2020-09-01
  • Balanced Low Earth Satellite Orbits
    Adv. Astron. (IF 2.353) Pub Date : 2020-08-19
    A. Mostafa; M. H. El Dewaik

    The present work aims at constructing an atlas of the balanced Earth satellite orbits with respect to the secular and long periodic effects of Earth oblateness with the harmonics of the geopotential retained up to the 4th zonal harmonic. The variations of the elements are averaged over the fast and medium angles, thus retaining only the secular and long periodic terms. The models obtained cover the

    更新日期:2020-08-19
  • The Existence and Effect of Dark Energy Redshift on Cosmological Age
    Adv. Astron. (IF 2.353) Pub Date : 2020-08-11
    Riccardo C. Storti

    A derivation of Cosmological Age explicitly constrained by Cosmic Microwave Background Radiation (CMBR) is presented, demonstrating that the correct value of Cosmological Age is equal to the Hubble Age. It is shown that utilizing “z = 0” for Cosmological Redshift in the Present Epoch introduces a fundamental flaw into Cosmological Age calculations. However, this flaw is captured and corrected by the

    更新日期:2020-08-11
  • Central Configurations and Action Minimizing Orbits in Kite Four-Body Problem
    Adv. Astron. (IF 2.353) Pub Date : 2020-08-01
    B. Benhammouda; A. Mansur; M. Shoaib; I. Szücs-Csillik; D. Offin

    In the current article, we study the kite four-body problems with the goal of identifying global regions in the mass parameter space which admits a corresponding central configuration of the four masses. We consider two different types of symmetrical configurations. In each of the two cases, the existence of a continuous family of central configurations for positive masses is shown. We address the

    更新日期:2020-08-01
  • Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method
    Adv. Astron. (IF 2.353) Pub Date : 2020-07-03
    Kai Wang; Maozheng Chen; Jun Ma; Xuefeng Duan; Yang Wang; Liang Cao; Hao Yan; Binbin Xiang

    The receiver is a signal receiving device in a radio telescope system. As an important parameter to characterize the receiver performance, noise temperature is very practical to calibrate accurately. The traditional receiver noise temperature calibration method is the cold and ambient load method. Through the establishment of K-band ambient receiver, and its amplitude calibration test platform of the

    更新日期:2020-07-03
  • Introducing Our New Chief Editor
    Adv. Astron. (IF 2.353) Pub Date : 2020-06-30
    Josep M. Trigo-Rodríguez

    Advances in Astronomy is pleased to announce the appointment of Prof Josep Trigo Rodríguez as its new Chief Editor. In this Editorial, Prof Trigo introduces himself, describes some of the journal’s journey and current status, and shares his vision and aspirations for its future.

    更新日期:2020-06-30
  • Classification of Continuous Sky Brightness Data Using Random Forest
    Adv. Astron. (IF 2.353) Pub Date : 2020-04-01
    Rhorom Priyatikanto; Lidia Mayangsari; Rudi A. Prihandoko; Agustinus G. Admiranto

    Sky brightness measuring and monitoring are required to mitigate the negative effect of light pollution as a byproduct of modern civilization. Good handling of a pile of sky brightness data includes evaluation and classification of the data according to its quality and characteristics such that further analysis and inference can be conducted properly. This study aims to develop a classification model

    更新日期:2020-04-01
  • Fermi Degenerate Antineutrino Star Model of Dark Energy
    Adv. Astron. (IF 2.353) Pub Date : 2020-03-30
    Tom F. Neiser

    When the Large Hadron Collider resumes operations in 2021, several experiments will directly measure the motion of antihydrogen in free fall for the first time. Our current understanding of the universe is not yet fully prepared for the possibility that antimatter has negative gravitational mass. This paper proposes a model of cosmology, where the state of high energy density of the big bang is created

    更新日期:2020-03-30
  • Responses and Periodic Variations of Cosmic Ray Intensity and Solar Wind Speed to Sunspot Numbers
    Adv. Astron. (IF 2.353) Pub Date : 2020-02-24
    Jacob Oloketuyi; Yu Liu; Amobichukwu Chukwudi Amanambu; Mingyu Zhao

    To investigate the periodic behaviour and relationship of sunspot numbers with cosmic ray intensity and solar wind speed, we present analysis from daily data generated from 1995 January to 2018 December. Cross-correlation and wavelet transform tools were employed to carry out the investigation. The analyses confirmed that the cosmic ray intensity correlates negatively with the sunspot numbers, exhibiting

    更新日期:2020-02-24
  • A CME Automatic Detection Method Based on Adaptive Background Learning Technology
    Adv. Astron. (IF 2.353) Pub Date : 2019-11-07
    Zhenping Qiang; Xianyong Bai; Qinghui Zhang; Hong Lin

    In this paper, we describe a technique, which uses an adaptive background learning method to detect the CME (coronal mass ejections) automatically from SOHO/LASCO C2 image sequences. The method consists of several modules: adaptive background module, candidate CME area detection module, and CME detection module. The core of the method is based on adaptive background learning, where CMEs are assumed

    更新日期:2019-11-07
  • Mask-Pix2Pix Network for Overexposure Region Recovery of Solar Image
    Adv. Astron. (IF 2.353) Pub Date : 2019-09-05
    Dong Zhao; Long Xu; Linjie Chen; Yihua Yan; Ling-Yu Duan

    Overexposure may happen for imaging of solar observation as extremely violet solar bursts occur, which means that signal intensity goes beyond the dynamic range of imaging system of a telescope, resulting in loss of signal. For example, during solar flare, Atmospheric Imaging Assembly (AIA) of Solar Dynamics Observatory (SDO) often records overexposed images/videos, resulting loss of fine structures

    更新日期:2019-09-05
  • Intelligent Recognition of Time Stamp Characters in Solar Scanned Images from Film
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-28
    Jiafeng Zhang; Guangzhong Lin; Shuguang Zeng; Sheng Zheng; Xiao Yang; Ganghua Lin; Xiangyun Zeng; Haimin Wang

    Prior to the availability of digital cameras, the solar observational images are typically recorded on films, and the information such as date and time were stamped in the same frames on film. It is significant to extract the time stamp information on the film so that the researchers can efficiently use the image data. This paper introduces an intelligent method for extracting time stamp information

    更新日期:2019-08-28
  • Full-Disk Solar Flare Forecasting Model Based on Data Mining Method
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-01
    Rong Li; Yong Du

    Solar flare is one of the violent solar eruptive phenomena; many solar flare forecasting models are built based on the properties of active regions. However, most of these models only focus on active regions within 30° of solar disk center because of the projection effect. Using cost sensitive decision tree algorithm, we build two solar flare forecasting models from the active regions within 30° of

    更新日期:2019-08-01
  • Deep Learning for Automatic Recognition of Magnetic Type in Sunspot Groups
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-01
    Yuanhui Fang; Yanmei Cui; Xianzhi Ao

    Sunspots are darker areas on the Sun’s photosphere and most of solar eruptions occur in complex sunspot groups. The Mount Wilson classification scheme describes the spatial distribution of magnetic polarities in sunspot groups, which plays an important role in forecasting solar flares. With the rapid accumulation of solar observation data, automatic recognition of magnetic type in sunspot groups is

    更新日期:2019-08-01
  • Effect of Ap-Index of Geomagnetic Activity on S&P 500 Stock Market Return
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-14
    Lifang Peng; Ning Li; Jingwen Pan

    Geomagnetic activity with global influence is an essential object of space weather research and is a significant link in the section of the solar wind-magnetospheric coupling process. Research so far provides strong evidence that geomagnetic activity affects stock investment decisions by influencing human health, mood, and human behaviours. Therefore, this research investigates the empirical association

    更新日期:2019-07-14
  • Single and Multiwavelength Detection of Coronal Dimming and Coronal Wave Using Faster R-CNN
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-08
    Zongxia Xie; Chunyang Ji

    Automatic detection of solar events, especially uncommon events such as coronal dimming (CD) and coronal wave (CW), is very important in solar physics research. The CD and CW are not only related to the detection of coronal mass ejections (CMEs) but also affect space weather. In this paper, we have studied methods for automatically detecting them. In addition, we have collected and processed a dataset

    更新日期:2019-07-08
  • Structural Analysis of Lunar Regolith from LPR CH-2 Data Based on Adaptive f-x E MD: LPR Data Processed by Adaptive f-x EMD
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-01
    Bin Hu; Deli Wang; Ling Zhang; Zhaofa Zeng

    The Lunar Penetrating Radar (LPR) is one of the important scientific payloads in China’s Chang’E-3 (CE-3) to image within 100 m below the lunar surface. The acquired LPR data is significant for the research of lunar geological structure. Based on the sedimentary mechanism of lunar regolith, the regolith contains many rocks with different sizes. These local anomalies appear as diffraction in LPR data

    更新日期:2019-07-01
  • Several Geological Issues of Schrödinger Basin Exposed by CE-2 CELMS Data
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-01
    Z. G. Meng; H. H. Wang; Y. C. Zheng; Y. Z. Wang; H. Miyamoto; Z. C. Cai; J. S. Ping; Y. Z. Zhu

    The study on the Schrödinger basin may provide important clues about the formation of South Pole-Aitken (SPA) basin. In this paper, the thermophysical features of Schrödinger basin were evaluated using the Chang’E-2 microwave sounder (CELMS) data. The results are as follows. (1) The geological units are reevaluated with the CELMS data and a new geological view was provided according to the brightness

    更新日期:2019-07-01
  • Disk-Integrated Lunar Brightness Temperatures between 89 and 190 GHz
    Adv. Astron. (IF 2.353) Pub Date : 2019-06-02
    Martin J. Burgdorf; Stefan A. Buehler; Imke Hans; Marc Prange

    Measurements of the disk-integrated brightness temperature of the Moon at 89, 157, 183, and 190 GHz are presented for phase angles between -80° and 50° relative to full Moon. They were obtained with the Microwave Humidity Sounder (MHS) on NOAA-18 from 39 instances when the Moon appeared in the deep space view of the instrument. Polynomials were fitted to the measured values and the maximum temperature

    更新日期:2019-06-02
  • Observations of Radio Magnetars with the Deep Space Network
    Adv. Astron. (IF 2.353) Pub Date : 2019-06-02
    Aaron B. Pearlman; Walid A. Majid; Thomas A. Prince

    The Deep Space Network (DSN) is a worldwide array of radio telescopes which supports NASA’s interplanetary spacecraft missions. When the DSN antennas are not communicating with spacecraft, they provide a valuable resource for performing observations of radio magnetars, searches for new pulsars at the Galactic Center, and additional pulsar-related studies. We describe the DSN’s capabilities for carrying

    更新日期:2019-06-02
  • Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight
    Adv. Astron. (IF 2.353) Pub Date : 2019-06-02
    SongTao Han; ZhongKai Zhang; Jing Sun; JianFeng Cao; Lue Chen; Weitao Lu; WenXiao Li

    China Chang’E-3 performed soft landing at the plains of Sinus Iridum on lunar surface on December 2013 successfully; it opened a new window for observing lunar surface with radiometric tracking which many lunar scientific researchers always pursue for. Since July 2014, OCEL (Observing Chang’E-3 Lander with VLBI) project has been conducted jointly by IVS (International VLBI Service of Geodesy and Astrometry)

    更新日期:2019-06-02
  • Extracting Filaments Based on Morphology Components Analysis from Radio Astronomical Images
    Adv. Astron. (IF 2.353) Pub Date : 2019-06-02
    M. Zhu; W. Liu; B. Y. Wang; M. F. Zhang; W. W. Tian; X. C. Yu; T. H. Liang; D. Wu; D. Hu; F. Q. Duan

    Filaments are a type of wide-existing astronomical structure. It is a challenge to separate filaments from radio astronomical images, because their radiation is usually weak. What is more, filaments often mix with bright objects, e.g., stars, which makes it difficult to separate them. In order to extract filaments, A. Men’shchikov proposed a method “getfilaments” to find filaments automatically. However

    更新日期:2019-06-02
  • A Cosmological Scenario from the Starobinsky Model within the Formalism
    Adv. Astron. (IF 2.353) Pub Date : 2019-06-02
    P. H. R. S. Moraes; P. K. Sahoo; G. Ribeiro; R. A. C. Correa

    In this paper we derive a novel cosmological model from the theory of gravitation, for which is the Ricci scalar and is the trace of the energy-momentum tensor. We consider the functional form , with being the Starobinsky Model, named , and , with and being constants. We show that a hybrid expansion law form for the scale factor is a solution for the derived Friedmann-like equations. In this way, the

    更新日期:2019-06-02
  • The Mid-Term Forecast Method of F10.7 Based on Extreme Ultraviolet Images
    Adv. Astron. (IF 2.353) Pub Date : 2019-05-13
    L. Lei; Q. Zhong; J. Wang; L. Shi; S. Liu

    The solar radio flux at 10.7cm (F10.7) is a direct monitor and an important indicator of solar variability, and F10.7 is commonly used in empirical atmospheric models, ionosphere models, etc. The source regions of F10.7 are mainly in the corona above the active regions, and the extreme ultraviolet (EUV) images reflect the coronal thermal structure. In this paper, an index is defined as based on the

    更新日期:2019-05-13
  • An Introduction to a New Space Debris Evolution Model: SOLEM
    Adv. Astron. (IF 2.353) Pub Date : 2019-05-06
    Xiao-wei Wang; Jing Liu

    SOLEM is the first space debris long-term evolution model of China. This paper describes the principles, components, and workflow of the SOLEM. The effects of different mitigation measures based on SOLEM model are analyzed and presented. The limitation of the model is pointed out and its future improvement work-plan is prospected.

    更新日期:2019-05-06
  • Relations between the Spectral Indices and Flux Densities of Eight Blazars
    Adv. Astron. (IF 2.353) Pub Date : 2019-05-02
    Yu-hai Yuan

    Relations between the flux densities (F) and spectral indices () can help us analyze the emission process. In this paper, we choose 8 blazars (0235+164, 0430+052, 1156+295, 3C345, 1308+326, 1413+135, 3C454.3, and 1749+096) from the University of Michigan Radio Observatory (UMRAO) database to study the relations between the spectral indices () and flux densities at 14.5GHz (). The main results are the

    更新日期:2019-05-02
  • The Fractal Geometry of the Cosmic Web and Its Formation
    Adv. Astron. (IF 2.353) Pub Date : 2019-05-02
    Jose Gaite

    The cosmic web structure is studied with the concepts and methods of fractal geometry, employing the adhesion model of cosmological dynamics as a basic reference. The structures of matter clusters and cosmic voids in cosmological N-body simulations or the Sloan Digital Sky Survey are elucidated by means of multifractal geometry. A nonlacunar multifractal geometry can encompass three fundamental descriptions

    更新日期:2019-05-02
  • A New Image Restoration Method for MUSER
    Adv. Astron. (IF 2.353) Pub Date : 2019-05-02
    Wei Wang; Yihua Yan

    Solar radio images in decimeter wave range consist of many complicated components including a disk component, some bright and weak compact sources, and many diffuse features. Complicated structures combining these various components maybe cause restoration failure when using conventional algorithms. Furthermore, the images at different frequencies band are pretty different. Therefore, restoration method

    更新日期:2019-05-02
  • Study of Chang’E-2 Microwave Radiometer Data in the Lunar Polar Region
    Adv. Astron. (IF 2.353) Pub Date : 2019-04-24
    Fan Yang; Yi Xu; Kwing Lam Chan; Xiaoping Zhang; Guoping Hu; Yong Li

    The Chang’E-2 (CE-2) four-channel microwave radiometer (MRM) data with frequencies of 3 GHz, 7.8 GHz, 19.35 GHz, and 37 GHz have been used to investigate the properties of lunar surface such as regolith thickness, dielectric constant, and titanium abundance within a depth of several meters in middle and low latitudes. The purpose of this work is to take a close look at MRM data in the polar regions

    更新日期:2019-04-24
  • Oscillating Cosmological Solutions in the Modified Theory of Induced Gravity
    Adv. Astron. (IF 2.353) Pub Date : 2019-04-24
    Farkhat Zaripov

    This work is the extension of author’s research, where the modified theory of induced gravity (MTIG) is proposed. In the framework of the MTIG, the mechanism of phase transitions and the description of multiphase behavior of the cosmological scenario are proposed. The theory describes two systems (stages): Einstein (ES) and “restructuring” (RS). This process resembles the phenomenon of a phase transition

    更新日期:2019-04-24
  • Mass Transfer and Intrinsic Light Variability in the Contact Binary MT Cas
    Adv. Astron. (IF 2.353) Pub Date : 2019-04-04
    Haifeng Dai; Huiyu Yuan; Yuangui Yang

    First CCD photometry for the contact binary MT Cas is performed in 2013 in December. The spectral type of F8V is determined from the low-precision spectrum observed on 2018 Oct 22. With Wilson-Devinney code, the photometric solutions are deduced from light curves (LCs) and AAVSO’s and ASAS-SN’s data, respectively. The results imply that MT Cas is a W-type weak-contact binary with a mass ratio of and

    更新日期:2019-04-04
  • Design and Implementation of Xinjiang Astronomical Observatory Astronomical Data Transmission Visualization System
    Adv. Astron. (IF 2.353) Pub Date : 2019-04-02
    Xinchen Ye; Hailong Zhang; Yan Zhu; Jie Wang; Tohtonur Ergesh; Huijuan Li

    With the development of astronomical observation technology, astronomical devices produce more data than ever. Astronomical telescopes are usually far away from city, so the long-distance data transmission between telescope and data center faces great challenges. Visualization system of astronomical data transmission with four-layer structure was built to manage data transmission. This visualization

    更新日期:2019-04-02
  • Revisiting the Question: The Cause of the Solar Cycle Variation of Total Solar Irradiance
    Adv. Astron. (IF 2.353) Pub Date : 2019-03-26
    N. B. Xiang

    The Mg II index and sunspot area are usually used to represent the intensification contribution by solar bright structures to total solar irradiance (TSI) and sunspot darkening, respectively. In order to understand the cause of the solar cycle variation of TSI, we use extension of wavelet transform, wavelet coherence (WTC), and partial wavelet coherence (PWC), to revisit this issue. The WTC of TSI

    更新日期:2019-03-26
  • Anthropic Principle’s Predicting Symmetric Distribution Matter Strata, Their Physics Laws, and Verifications
    Adv. Astron. (IF 2.353) Pub Date : 2019-03-18
    Changyu Huang; Yong-Chang Huang

    This paper shows anthropic principle’s predicting symmetric distribution matter strata, their physics laws, and verifications, concretely deduces characteristic time, energy, and temperature expressions at different scales, discovers four interesting invariant quantities, shows homeomorphic theorem of space map, and naturally presents a supersymmetric scale energy. We further discover that any infinitesimal

    更新日期:2019-03-18
  • Comparison of Decadal Trends among Total Solar Irradiance Composites of Satellite Observations
    Adv. Astron. (IF 2.353) Pub Date : 2019-03-10
    Nicola Scafetta; Richard C. Willson

    We present a new analysis of the two-decade-old controversy over interpretation of satellite observations of total solar irradiance (TSI) since 1978 and the implications of our findings for TSI as a driver of climate change. Our approach compares the methods of constructing the two most commonly referenced TSI composites (ACRIM and PMOD) that relate successive observational databases and two others

    更新日期:2019-03-10
  • Rain Attenuation Study at Ku-Band over Earth-Space Path in South Korea
    Adv. Astron. (IF 2.353) Pub Date : 2019-03-03
    Sujan Shrestha; Dong-You Choi

    Rain attenuation measurement techniques are studied with appropriate prediction of rain attenuation at Ku-band for Koreasat 6. This is accomplished by the establishment of experimental setup in Mokdong at 12.25 GHz link. The databases are analyzed for three years, 2013 till 2015. During observation period, rainfall rate of 50 mm/hr is obtained which is measured by OTT Parsivel showing the signal attenuated

    更新日期:2019-03-03
  • Nonlinear Stability of Oblate Infinitesimal in Elliptic Restricted Three-Body Problem Influenced by the Oblate and Radiating Primaries
    Adv. Astron. (IF 2.353) Pub Date : 2019-02-27
    A. Narayan; A. Chakraborty; A. Dewangan

    This work deals with the nonlinear stability of the elliptical restricted three-body problem with oblate and radiating primaries and the oblate infinitesimal. The stability has been analyzed for the resonance cases around and and also the nonresonance cases. It was observed that the motion of the infinitesimal in this system shows instable behavior when considered in the third order resonance. However

    更新日期:2019-02-27
  • Generalized Out-of-Plane Equilibrium Points in the Frame of Elliptic Restricted Three-Body Problem: Impact of Oblate Primary and Luminous-Triaxial Secondary
    Adv. Astron. (IF 2.353) Pub Date : 2019-02-26
    Aminu Abubakar Hussain; Aishetu Umar

    This paper studies the motion of a third body near the family of the out-of-plane equilibrium points, , in the elliptic restricted problem of three bodies under an oblate primary and a radiating-triaxial secondary. It is seen that the pair of points () which correspond to the positions of the family of the out-of-plane equilibrium points, , are affected by the oblateness of the primary, radiation pressure

    更新日期:2019-02-26
  • The Importance of Scalar Fields as Extradimensional Metric Components in Kaluza-Klein Models
    Adv. Astron. (IF 2.353) Pub Date : 2019-02-18
    P. H. R. S. Moraes; R. A. C. Correa

    Extradimensional models are achieving their highest popularity nowadays, among other reasons, because they can plausible explain some standard cosmology issues, such as the cosmological constant and hierarchy problems. In extradimensional models, we can infer that the four-dimensional matter rises as a geometric manifestation of the extra coordinate. In this way, although we still cannot see the extra

    更新日期:2019-02-18
  • New Photometric Investigation of the Solar-Type Shallow-Contact Binary HH Bootis
    Adv. Astron. (IF 2.353) Pub Date : 2019-02-06
    Jia-jia He; Jing-jing Wang

    The short-period solar-type contact binary HH Boo was monitored photometrically for about 8 years. It is found that the CCD light curves in the , , , and bands obtained in 2010 are symmetric, while the multicolor light curves observed in 2011 and 2012 by several investigators showed a positive O’Connell effect where the maxima following the primary minima are higher than the other ones. This indicates

    更新日期:2019-02-06
  • The XinJiang Astronomical Observatory NSRT Pulsar Data Archive
    Adv. Astron. (IF 2.353) Pub Date : 2019-01-23
    Hailong Zhang; Markus Demleitner; Jie Wang; Na Wang; Jun Nie; Jianping Yuan

    The sensitivity of our pulsar observation system with typical integration time of 16 minutes has reached 0.4 mJy after we have upgraded the receiver cooling system of NanShan 25-m radio telescope (NSRT) at Xinjiang Astronomical Observatory (XAO) in 2002. About 280 pulsars were observed after the upgrade. The NanShan station pulsar data is transmitted to the data center at XAO headquarters via a 300Mb/s

    更新日期:2019-01-23
  • Initial Parameter Analysis about Resonant Orbits in Earth-Moon System
    Adv. Astron. (IF 2.353) Pub Date : 2019-01-23
    Li-Bo Liu; Ying-Jing Qian; Xiao-Dong Yang

    The initial parameters about resonant orbits in the Earth-Moon system were investigated in this study. Resonant orbits with different ratios are obtained in the two-body problem and planar circular restricted three-body problem (i.e., PCRTBP). It is found that the eccentricity and initial phase are two important initial parameters of resonant orbits that affect the closest distance between the spacecraft

    更新日期:2019-01-23
  • Tsallis Holographic Dark Energy with Granda-Oliveros Scale in ()-Dimensional FRW Universe
    Adv. Astron. (IF 2.353) Pub Date : 2019-01-10
    Ayman A. Aly

    Based on Tsallis holographic dark energy model recently proposed by using the general model of the Tsallis entropy expression, we reconstruct cosmographic parameters, , and we study their evolution in spatially flat ()-dimensional Friedmann-Robertson-Walker universe using Granda-Oliveros scale. Our results show that the universe is in an accelerating expansion mode described by phantom-like behavior

    更新日期:2019-01-10
  • Review of the Empirical Evidence for Superluminal Particles and the 3 + 3 Model of the Neutrino Masses
    Adv. Astron. (IF 2.353) Pub Date : 2019-01-01
    Robert Ehrlich

    A review is given of hypothetical faster-than-light tachyons and the development of the author’s model of the neutrino mass states, which includes one tachyonic mass state doublet. Published empirical evidence for the model is summarized, including an interpretation of the mysterious Mont Blanc neutrino burst from SN 1987A as being due to tachyonic neutrinos having This possibility requires an 8 MeV

    更新日期:2019-01-01
  • Long-Term Optical and Spectral Variability of FSRQ 3C454.3
    Adv. Astron. (IF 2.353) Pub Date : 2018-12-02
    Yu-Hai Yuan; Ze-Xuan Chen; Yong-Xuan He

    3C454.3 is a widely studied and monitored flat spectrum radio quasar. We use the observations from the Small and Moderate Aperture Research Telescope System (SMARTS) to analyze the long-term optical and spectral variabilities of 3C454.3 at B, V, R, J, and K (BVRJK) bands. Based on the relation: , we calculate the multiband spectral indices () and analyze the relations between and , where is the flux

    更新日期:2018-12-02
  • Dynamo Theory, Nonlinear Magnetic Fields, and the Euler Potentials
    Adv. Astron. (IF 2.353) Pub Date : 2018-10-10
    Bob Osano

    The debate on the role of Euler potentials (EP), , in the dynamo theory is a long-standing one. It is known that the cross-product of gradients of two the potentials may represent magnetic fields lines. However, 2D and 3D dynamo hydromagnetic simulations suggest that their utility as analogues of magnetic field potential is restricted. This raises questions about their utility in the broader context

    更新日期:2018-10-10
  • Star Recognition Based on Path Optimization in Star Sensor with Multiple Fields of View
    Adv. Astron. (IF 2.353) Pub Date : 2018-10-01
    Di Jiang; Ke Zhang; Olivier Debeir

    Star sensors make use of astronomical information in stars to determine attitude for spacecrafts by star image recognition. For low-cost star sensors with small field of view, fusion of observed images from multiple fields of view is performed and a novel recognition algorithm based on path optimization by randomly distributed ant colony is proposed. According to pheromone intensity, the ant colony

    更新日期:2018-10-01
  • A Novel Scanning Method Applied to New-Style Solar Telescope Based on Autoguiding System
    Adv. Astron. (IF 2.353) Pub Date : 2018-09-12
    Zhi-ming Song; Zhong-quan Qu

    To expand field of view (FOV) of telescope, the method of special scanning often is used, but, for some telescopes with special structure in optics and machine, the conventional scanning methods are unsuitable. This paper proposes a novel scanning method based on autoguiding system so as to expand the FOV of fiber array solar optical telescope (FASOT) in possession of the special structure in optics

    更新日期:2018-09-12
  • High-Precision Heading Determination Based on the Sun for Mars Rover
    Adv. Astron. (IF 2.353) Pub Date : 2018-08-01
    Yinhu Zhan; Shaojie Chen; Donghan He

    Since the American Mars Exploration Rover Opportunity landed on Mars in 2004, it has travelled more than 40 km, and heading-determination technology based on its sun sensor has played an important role in safe driving of the rover. A high-precision heading-determination method will always play a significant role in the rover’s autonomous navigation system, and the precision of the measured heading

    更新日期:2018-08-01
  • Improving the Accuracy of the Martian Ephemeris Short-Term Prediction
    Adv. Astron. (IF 2.353) Pub Date : 2018-07-12
    Quan Shan; Peijia Li; Yong Huang; Min Fan; Haitao Li; Xiaogong Hu

    The Chinese Mars exploration mission is planned to be launched in 2020, which includes an orbiter, a lander, and a rover. High precision Martian ephemeris is very important in Mars exploration, especially for the Martian orbit insertion and the Martian lander/rover landing. In this paper, we used simulation data to analyze the short-term prediction accuracy of the Martian ephemeris. The simulation

    更新日期:2018-07-12
  • A New Lunar DEM Based on the Calibrated Chang’E-1 Laser Altimeter Data
    Adv. Astron. (IF 2.353) Pub Date : 2018-06-19
    Yong Huang; Shengqi Chang; Songhe Qin; Peijia Li; Xiaogong Hu; Min Fan

    To improve the lunar DEM accuracy derived from CE-1 altimeter data, CE-1 laser altimeter data are calibrated in this paper. Orbit accuracy and ranging accuracy are the two most important factors to affect the application of altimeter data in the lunar topography. An empirical method is proposed to calibrate CE-1 altimeter data, using gridded LOLA DEM to correct systematic errors of CE-1 altimeter data

    更新日期:2018-06-19
  • Poisson Denoising for Astronomical Images
    Adv. Astron. (IF 2.353) Pub Date : 2018-06-10
    Fahad Shamshad; M. Mohsin Riaz; Abdul Ghafoor

    A denoising scheme for astronomical color images/videos corrupted with Poisson noise is proposed. The scheme employs the concept of Exponential Principal Component Analysis and sparsity of image patches. The color space RGB is converted to YCbCr and -means++ clustering is applied on luminance component only. The cluster centers are used for chromatic components to improve the computational efficiency

    更新日期:2018-06-10
  • Gamma-Ray Burst Prompt Correlations
    Adv. Astron. (IF 2.353) Pub Date : 2018-01-24
    M. G. Dainotti; R. Del Vecchio; M. Tarnopolski

    The mechanism responsible for the prompt emission of gamma-ray bursts (GRBs) is still a debated issue. The prompt phase-related GRB correlations can allow discriminating among the most plausible theoretical models explaining this emission. We present an overview of the observational two-parameter correlations, their physical interpretations, and their use as redshift estimators and possibly as cosmological

    更新日期:2018-01-24
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