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IAUC 8923: C/2008 E1; C/2007 Y10

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IAUC number

                                                  Circular No. 8923
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     An apparently asteroidal object discovery by the Catalina Sky
Survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been noted by numerous
astrometric CCD observers to show cometary appearance.  P.
Birtwhistle (Great Shefford, Berkshire, England 0.40-m f/6 Schmidt-
Cassegrain reflector, Mar. 3.82-3.83 UT, relatively poor seeing)
writes that this object appears to be distinctly more diffuse than
nearby stars of similar brightness, having a diameter of 9" and a
possible extension from the center of light extending 12" in p.a.
40 deg.  J. V. Scotti (Spacewatch 1.8-m f/2.7 reflector, Mar. 4.12-
4.16) reports a coma diameter of 6"-8" and a tail extending about
5".4-7".2 in p.a. 31 deg.  A. Boattini (Mt. Lemmon 1.5-m reflector,
co-addition of four 90-s images from Mar. 4.13-4.14, bad seeing)
measures a coma diameter of about 7" x 8" (slight asymmetry along a
NNE-SSW axis).  E. Guido and G. Sostero (Castellammare di Stabia,
Italy, remotely using a 0.25-m f/3.4 reflector near Mayhill, NM,
U.S.A.; sixty co-added 60-s unfiltered exposures, Mar. 4.1) find a
diffuse coma of diameter nearly 12".

     2008 UT             R.A. (2000) Decl.       Mag.
     Mar.  2.14405    4 28 12.21   -11 26 17.6   19.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2008-E41.

     T = 2008 Oct. 29.722 TT          Peri. = 285.589
                                      Node  = 183.644   2000.0
     q = 4.82300 AU                   Incl. =  34.263

COMET C/2007 Y10 (SOHO)
     Further to IAUC 8921, tabulated below is the "discovery"
observation for an additional Kreutz sungrazing comet found on SOHO
website images; the object appeared stellar (mag about 5.5) in
C3-coronagraph images, and showed a short, faint, diffuse tail in
C2 images.

 Comet        2007 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2007 Y10   Dec. 28.988   18 41.5  -28 06   C3/2   BZ   2008-B61

                      (C) Copyright 2008 CBAT
2008 March 4                   (8923)            Daniel W. E. Green

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