Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558..403u&link_type=abstract
The Astrophysical Journal, Volume 558, Issue 1, pp. 403-410.
Astronomy and Astrophysics
Astronomy
15
Comets: General, Comets: Individual (C/2000 C6), Sun: Solar Wind, Ultraviolet: Solar System
Scientific paper
During 2000 February 9-10, the Large Angle Spectrometric Coronagraph and Ultraviolet Coronal Spectrometer (UVCS) instruments aboard the Solar and Heliospheric Observatory observed comet C/2000 C6, a member of the Kreutz family of sungrazing comets. A tail nearly 0.5 Rsolar in length was detected in Lyα emission. UVCS was able to observe the comet at four heights as it approached the Sun. A jump in the Lyα brightness between 5.71 and 4.56 Rsolar suggests that the nucleus fragmented, exposing more area to solar illumination and increasing the outgassing rate. We interpret the Lyα luminosity in terms of the outgassing rate and use this to estimate the diameter of the nucleus. The Lyα emission fades as H I is ionized, providing estimates of the density in the coronal streamer encountered by the comet.
Biesecker Doug
Ko Kyeong Yeon
Marsden Brian
Raymond John C.
Uzzo Michael
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