论文标题
星际彗星2i/borisov展示了类似于本地太阳系彗星的结构
Interstellar Comet 2I/Borisov exhibits a structure similar to native Solar System comets
论文作者
论文摘要
我们处理了使用哈勃太空望远镜（HST）拍摄的图像，以研究内部昏迷中的任何形态特征，暗示了对星际彗星2i/borisov核的特殊活性。昏迷在位置角（PA）〜0-180D方向上显示出明显的伸长，这似乎与源自核上单个活性源的射流有关。通过分析在不同日期拍摄的HST图像上的内部昏迷形态的变化并用不同的过滤器处理，该射流的对应物检测到针对PA〜10D。这些发现表明，核可能是在天空平面附近投射的旋转轴旋转，并在PA〜100d-280d处定向，并且活性源位于近乎附加的位置。随后对HST的观察结果使我们能够在RA = 17H20M +/- 15D和DEC = -35D+\ -10D时确定自旋轴的方向。
We processed images taken with the Hubble Space Telescope (HST) to investigate any morphological features in the inner coma suggestive of a peculiar activity on the nucleus of the interstellar comet 2I/Borisov. The coma shows an evident elongation, in the position angle (PA) ~0-180d direction, which appears related to the presence of a jet originating from a single active source on the nucleus. A counterpart of this jet directed towards PA ~10d was detected through analysis of the changes of the inner coma morphology on HST images taken in different dates and processed with different filters. These findings indicate that the nucleus is probably rotating with a spin axis projected near the plane of the sky and oriented at PA ~100d-280d, and that the active source is lying in a near-equatorial position. Subsequent observations of HST allowed us to determine the direction of the spin axis at RA=17h20m+/-15d and Dec = -35d+\-10d.
