C/2002 VQ94 (LINEAR) and 29P/Schwassmann-Wachmann 1 — CO and N2 rich comets |
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| Authors: | Pavlo P Korsun Oleksandra V Ivanova |
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| Institution: | a Main Astronomical Observatory of NAS of Ukraine, Akademika Zabolotnoho 27, 03680 Kyiv, Ukraine
b Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 369167, Russia |
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| Abstract: | We investigated comets active at large heliocentric distances using observations obtained at the 6-m BTA telescope (SAO RAS, Russia). Long-slit and photometric modes of the focal reducer SCORPIO were used. Two of the comets, 29P/Schwassmann-Wachmann 1 (SW1) and C/2002 VQ94 (LINEAR) were observed to be emission rich. Detection of CO+ and N+2 emissions in the comae of these comets is evidence that they were formed in the outer regions of the Solar System or in a pre-solar interstellar cloud in a low temperature environment with T?25 K. The ratio of N+2/CO+ is equal to 0.011 and 0.027 for SW1 and LINEAR, respectively. Comet LINEAR is the most distant object in the Solar System (7.332 AU) for which CO+ and N+2 are measured. The photometric maximum of the isolated CO+ coma in Comet LINEAR is shifted by 1.4 arcsec (7.44×103 km) relative to the photometric maximum of the dust coma. This shift deviates from the sunward direction by 63 degrees. |
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| Keywords: | Comets composition Spectrophotometry |
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