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主題: C/2017 U7 (PANSTARRS)=A /2017 U7 作者: peter 於 2020-03-19 19:06:13 https://en.wikipedia.org/wiki/C/2017_U7
https://www.minorplanetcenter.net/mpec/K20/K20F58.html Although C/2017 U7's orbit is no longer bound to the Solar System, unlike ʻOumuamua, it is probably not an interstellar object. It had an inbound orbital period of roughly 800000 years. A barycentric orbit of C/2017 U7, however, shows that it is only a very distant Solar System object, approaching as far as 16,000 ± 1,000 AU from the Sun, around the distance of the Oort Cloud. |