C/2002 VQ94 (LINEAR) and 29P/Schwassmann Wachmann 1 — CO+ and N+2 rich comets

Details C/2002 VQ94 (LINEAR) and 29P/Schwassmann Wachmann 1 — CO+ and N+2 rich comets C/2002 VQ94 (LINEAR) and 29P/Schwassmann Wachmann 1 — CO+ and N+2 rich comets

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008icar..198..465k&link_type=abstract

Icarus, Volume 198, Issue 2, p. 465-471.

Physics

3

Scientific paper

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 (7.44×10 km) relative to the photometric maximum of the dust coma. This shift deviates from the sunward direction by 63 degrees.

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