[AZ-Observing] Re: Comet Holmes first look tonight
- From: "L Knauth" <Knauth@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 26 Oct 2007 20:13:32 -0700
This from the IAU:
COMET 17P/HOLMES
H. Kobayashi, H. Kawakita, and A. Nishikoji, Kyoto Sangyo
University, report that they have obtained low-dispersion spectra
of comet 17P on Oct. 24.58 and 25.46 UT with a 28-cm telescope (+
F2SPEC spectrograph; range 380-750 nm, resolution 900 at 600 nm).
The comet's spectrum on Oct. 24.58 was dominated by reflected
sunlight, and there were no significant emission bands and lines
visible. The Oct. 25.46 spectrum was still dominated by reflected
sunlight, but emission bands and lines (CN and C_2 bands, as well
as [O I] emission lines) appeared in the spectrum. The authors
speculate that this delay in the visibility of emission might be at
least partly caused by sublimation from icy grains ejected at the
outburst.
Paul Knauth
School of Earth and Space Exploration
Arizona State University
Tempe, AZ 85287-1404
480-965-2867 (voice)
480-965-8102 (Fax)
http://www.public.asu.edu/~iaclpk/
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