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First light of SOVAG, a spectrograph for visible and near-infrared observation of asteroids
Experimental Astronomy ( IF 3 ) Pub Date : 2020-10-15 , DOI: 10.1007/s10686-020-09678-5
M. Birlan , F. Colas , F. Cochard , D. Darson , B. Carry , P. Vernazza , A. Nedelcu , J. Dubois , S. Fornasier , D. Perna , P. Morfin

Spectroscopy in the visible and near-infrared has been the main tool for characterising the surface properties of asteroids for decades. For a given target, the two wavelength regimes are usually acquired by different telescopes/instruments, separated by years. They are seldom obtained simultaneously. However, it is not straightforward to combine datasets from different sources because of the spectral reddening linked with phase angle. We present the first-light result of SOVAG (Spectrographe pour l’Observations dans le Visible et infrarouge proche d’Asteroides Geocroiseurs), a new concept of spectrograph for observing both wavelength ranges at the same time. It is compact in design and portable. We developed a prototype of this instrument between 2016 and 2018. In July 2018, we mounted SOVAG on the 1 m-telescope in Pic du Midi observatory (for which it was designed) and conducted its on-sky first light experiment. We present a spectrum of (4) Vesta which demonstrates the reliability of observations and the accuracy of the calibration. Ongoing development will allow us to push observation-limits toward fainter objects.

中文翻译:

SOVAG的第一道光,一种用于小行星可见光和近红外观测的光谱仪

几十年来,可见光和近红外光谱一直是表征小行星表面特性的主要工具。对于给定的目标,两个波长范围通常由不同的望远镜/仪器获得,相隔多年。它们很少同时获得。然而,由于与相位角相关的光谱红化,将来自不同来源的数据集组合起来并不简单。我们展示了 SOVAG(Spectrographe pour l'Observations dans le Visible et infrarouge proche d'Asteroides Geocroiseurs)的第一次光照结果,这是一种用于同时观察两个波长范围的光谱仪的新概念。它设计紧凑,便于携带。我们在 2016 年至 2018 年间开发了该仪器的原型。 2018 年 7 月,我们将 SOVAG 安装在 Pic du Midi 天文台的 1 米望远镜上(它是为此设计的),并进行了首次在天空上的光实验。我们展示了 (4) 灶神星的光谱,它证明了观测的可靠性和校准的准确性。持续的发展将使我们能够将观察极限推向较暗的物体。
更新日期:2020-10-15
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