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IAUC 8785: C/2006 YC; V2362 Cyg

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IAUC number

                                                  Circular No. 8785
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Tabulated below are the initial observations of a comet that
was discovered almost simultaneously via the Catalina Sky Survey
(with the observer, A. R. Gibbs, reporting the object as apparently
asteroidal on the 0.68-m Schmidt telescope exposures) and the Mount
Lemmon Survey (whose observer, E. J. Christensen, reported a 6"
coma and 10" tail in p.a. 270 degrees on four 30-s co-added
discovery images taken with the 1.5-m reflector).  Images taken in
fair-to-poor seeing at Mt. Lemmon by E. C. Beshore on Dec. 20.5
show a moderately condensed coma about 6" in diameter with a 10"
tail in p.a. 250 degrees.  When K. Smalley designated the object as
2006 YC via MPEC 2006-Y15 on Dec. 17, he unfortunately was unaware
of Christensen's report (submitted to the Central Bureau and to
other Minor Planet Center staff members) of the object's cometary

     2006 UT             R.A. (2000) Decl.       Mag.   Observer
     Dec. 16.41622   10 31 38.56   - 4 08 53.4   20.0   Gibbs
          16.48765   10 31 38.94   - 4 08 33.2   19.4   Christensen

Additional astrometry, the following parabolic orbital elements,
and an ephemeris appear on MPEC 2006-Y26.

     T = 2007 Sept.25.985 TT          Peri. =  29.255
                                      Node  = 152.881   2000.0
     q = 4.23768 AU                   Incl. =  73.988

     D. K. Lynch, R. W. Russell, D. Kim, The Aerospace Corporation;
and M. L. Sitko and S. Brafford, University of Cincinnati and Space
Science Institute, report that 3- to 13-micron spectroscopy of
V2362 Cyg (cf. IAUC 8731) on Dec. 12.25 UT using BASS on the
Infrared Telescope Facility showed a smooth stellar-like continuum
decreasing monotonically toward longer wavelengths between 3 and 13
microns with no evidence of thermal emission from dust.  Infrared
magnitudes at that time were L = 5.0 +/- 0.1, M = 4.5 +/- 0.2, N =
4.0 +/- 0.2.
     Visual magnitude estimates:  Nov. 15.736 UT, 11.5 (M. Lehky,
Hradec Kralove, Czech Republic); 18.731, 10.9 (A. Diepvens, Balen,
Belgium); Dec. 10.836, 12.0 (J. Carvajal, Madrid, Spain).

                      (C) Copyright 2006 CBAT
2006 December 20               (8785)            Daniel W. E. Green

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