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IAUC 8823: C/2007 F1; 1996cr, 2004ip

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IAUC number

                                                  Circular No. 8823
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)

     An apparently asteroidal object discovered by the LONEOS
project (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been found to be
cometary by several CCD astrometrists.  J. Young (Table Mountain,
0.61-m f/16 Cassegrain reflector) found the object to have a
slightly elongated (north-to-south), 8" coma with no central
condensation and a hint of a short, straight 12" tail in p.a. 175
deg on images taken on Mar. 19.5 UT; his images from Mar. 20.22-
20.25, taken through very light cirrus clouds, confirm a 12" tail
in p.a. 185 deg and a 4" coma with some condensation.  Twenty-six
co-added 60-s unfiltered images taken by L. Donato, M. Gonano, V.
Santini, and G. Sostero (Remanzacco, Italy, 0.45-m f/4.4 reflector)
on Mar. 20.9 reveal the presence of a compact coma of diameter
almost 20" and total mag near 18.5.  P. Birtwhistle (Great Shefford,
Berkshire, England, 0.40-m f/6 Schmidt-Cassegrain reflector) writes
that his co-added exposures (totalling 22.5 min) from Mar. 21.1
show a thin, straight tail 90" long in p.a. 235 deg, and a coma
diameter of 7".

     2007 UT             R.A. (2000) Decl.       Mag.
     Mar. 19.26399   11 22 57.60   +20 11 58.2   19.5

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-F52.

     T = 2007 Nov.  3.288 TT          Peri. = 152.188
                                      Node  = 173.522   2000.0
     q = 0.44459 AU                   Incl. = 118.707

SUPERNOVAE 1996cr AND 2004ip
     An apparent type-IIn supernova initially identified as an
x-ray source in ESO 97-G13, and subsequently identified by F. Bauer
and colleagues on numerous archival CCD images obtained with the
Anglo-Australian Telescope in mid-March 1996, has been given the
designation SN 1996cr (details on CBET 879).  An apparent supernova
reported by S. Mattila et al. from K_s-band infrared images in Sept.
2004, and designated then as PSN K0409-001 (cf. IAUC 8335), has
been now designated as SN 2004ip, with additional details given on
CBET 858.

                      (C) Copyright 2007 CBAT
2007 March 21                  (8823)            Daniel W. E. Green

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