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IAUC 8797: P/2007 B1; C/2006 P1; 183P

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IAUC number

                                                  Circular No. 8797
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)

     E. J. Christensen reports his discovery of a comet on CCD
images obtained with the Catalina Sky Survey's 0.68-m Schmidt
telescope (discovery observation tabulated below); four stacked
30-s discovery images, taken in good seeing, show a slightly
condensed 10" coma, while four stacked 90-s follow-up images reveal
a 15" tail oriented toward p.a. 220-250 deg.  Following posting on
the Minor Planet Center's 'NEOCP' webpage, several other CCD
observers have noted the object's cometary appearance, including G.
Sostero and L. Donato at Remanzacco, Italy (0.45-m f/4.4 reflector,
Jan. 20.04-20.09 UT; coma diameter 10" with a 16" tail toward p.a.
250 deg); D. Mayes at Table Mountain (0.6-m reflector, Jan. 20.4);
and L. Buzzi at Varese, Italy (0.60-m f/4.6 reflector, Jan. 20.0;
60 stacked 15-s exposures show a compact 10" coma with a possible
elongation in p.a. about 230 deg).

     2007 UT             R.A. (2000) Decl.       Mag.
     Jan. 17.27421    8 57 29.84   +32 29 41.0   18.6

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2007-B25.

     T = 2007 Feb.  8.351 TT          Peri. =  54.294
     e = 0.57317                      Node  =  76.702   2000.0
     q = 2.42086 AU                   Incl. =  12.114
       a =  5.67165 AU     n = 0.072969     P =  13.5 years

     Unfiltered-CCD total-magnitude estimates in daylight:  Jan.
13.14 and 14.13 UT, -5.0 (A. Nakamura, Kuma, Ehime, Japan, 7.2-cm
reflector; integrated coma diameter 1'.4); 15.48, -5.2 (K. Hornoch,
J. Srba, and E. Brezina, Vsetin Observatory, Czech Republic, 6.3-cm
reflector + neutral-density filter; aperture size 8').  Further
visual total-magnitude estimates:  Jan. 16.94, -2.8 (S. J. O'Meara,
Mauna Loa, HI, U.S.A., 10x50 binoculars, daylight; 0.5-deg tail);
18.50, -2.1 (A. Pearce, City Beach, W. Australia, naked eye;
4.5-deg tail); 20.51, -0.7 (Pearce; 23 deg tail; tail synchrones
easily visible).

     Comet P/2006 Y1 = 1999 DN_3 (cf. IAUC 8786) has been numbered
183P (cf. MPC 58485).

                      (C) Copyright 2007 CBAT
2007 January 20                (8797)            Daniel W. E. Green

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