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IAUC 8595: P/2005 Q4; C/2005 R1

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IAUC number


                                                  Circular No. 8595
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2005 Q4 (LINEAR)
     An apparently asteroidal object discovered by LINEAR
(discovery observation below), and posted on the 'NEO Confirmation
Page', has been found to show a 16" tail in p.a. 255 deg on CCD
images taken by J. Lacruz (Madrid, Spain, 0.30-m reflector) on Sept.
3.04-3.05 UT.  J. Young (Table Mountain, 0.6-m f/16 Cassegrain
reflector) reports that his long CCD exposures taken on Sept. 4.5
show an extension 16" long between p.a. 240 deg and 270 deg and a
very round, condensed coma 4" in diameter in very good seeing; his
images on Sept. 5.5 show a 6" slightly elongated coma (total mag
17.5) with a 40" straight, narrow tail in p.a. 265 deg.

     2005 UT             R.A. (2000) Decl.       Mag.
     Aug. 31.40325    5 14 52.38   +33 52 04.4   19.1

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2005-R24.

     T = 2005 Sept.28.882 TT          Peri. =  51.377
     e = 0.55154                      Node  =  10.811   2000.0
     q = 1.73505 AU                   Incl. =  17.531
       a =  3.86888 AU     n = 0.129517     P =   7.6 years


COMET C/2005 R1 (NEAT)
     K. J. Lawrence reports the NEAT discovery of a comet, on CCD
images taken with the 1.2-m Schmidt telescope at Palomar (discovery
observation below), whose image appears somewhat softer than
surrounding stars and has a possible short tail toward the
southwest.  Young reports that his images taken on Sept. 5.44-5.45
UT show a 6" round coma of mag 17.6 with a broad 14" tail spanning
p.a. 240-260 deg.

     2005 UT             R.A. (2000) Decl.       Mag.
     Sept. 2.42614    0 37 07.81   +31 42 49.5   18.0

Preliminary elliptical orbital elements from MPEC 2005-R25:

     T = 2005 Oct.  8.552 TT          Peri. = 117.622
     e = 0.64458                      Node  = 259.502   2000.0
     q = 2.06554 AU                   Incl. =  15.489
       a =  5.81161 AU     n = 0.070349     P =  14.0 years

                      (C) Copyright 2005 CBAT
2005 September 5               (8595)            Daniel W. E. Green

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