The green comet C/2007 N3 (Lulin) is a new Oort cloud comet that has a retrograde orbit (inclination of |$178^{\circ }$|⁠). It reached its perihelion on 2009 January 10, and its closest distance to Earth was 0.411 astronomical units (au) on February 24. Soon after its discovery on 2007 July 11, the coma activity of Comet Lulin was monitored closely by an Super Light Telescope 41 cm telescope until 2009 April. After long-term monitoring of Comet Lulin, the dust production rate [A(θ)fρ] was estimated. An unexpected increase in the |${A(0)f\rho}$| near the perigee appears to indicate an opposition effect. By investigating the surface brightness profiles, dust-to-gas ratios, and magnitudes, we ruled out the influences of gas and ion contamination and the outburst phenomenon. We discovered the anti-tail in late December 2008 but were unsure of the composition. We found that this abnormal tail lasted for a considerable time because of the effect of the orbital geometry. We also found that the jet activity coincided with the peak |${A(\theta)f\rho}$| values, and this clue helped us realize what was happening in the dust coma of Comet Lulin.

中文翻译：

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鹿林天文台SLT监测的C / 2007 N3彗星（Lulin）的长期活动

绿色彗星C / 2007 N3（卢林）是一种新的奥尔特云彗星，具有逆行轨道（倾角| $ 178 ^ {\ circ} $ |⁠）。它在2009年1月10日到达近日点，在2月24日它与地球的最接近距离是0.411天文单位（au）。在2007年7月11日发现它之后，不久便用超轻望远镜41对其进行了密切监视。厘米望远镜直到2009年4月。在对卢林彗星进行长期监测之后，估计了粉尘产生率[ A（θ）fρ ]。| $ {A（0）f \ rho} $ |意外增加近地点附近的人似乎表明存在反作用。通过研究表面亮度分布，灰尘与气体的比率以及大小，我们排除了气体和离子污染以及爆发现象的影响。我们在2008年12月下旬发现了反尾巴，但不确定其组成。我们发现，由于轨道几何形状的影响，这种异常的尾巴持续了相当长的时间。我们还发现喷射活动与峰值| $ {A（\ theta）f \ rho} $ |相符。值，这一线索帮助我们意识到了卢林彗星尘埃昏迷中正在发生的事情。