21P/Giacobini-Zinner

Large Version
2018 September 30 3h20m(AM) C/21P 赤經:06h49m03s 赤緯:+01d40min 02" 彗尾約9-10min 目視觀測7.8等 8cm 導星鏡 21倍
© 2018 Young Chiech Tsao

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