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IAUC 8240: P/2002 LZ_11

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                                                  Circular No. 8240
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/2002 LZ_11 (LINEAR)
     An apparently asteroidal object with not-unusual motion
recorded by the LINEAR project (discovery observation from MPS
57856 below), and linked over 2002 June 5-13 and designated by the
Minor Planet Center as 2002 LZ_11 (but indicated on MPEC 2002-L64
as having a cometary orbit), was accidentally reobserved by LINEAR
on numerous occasions in July 2002 and during July-Nov. 2003 (and
by LONEOS on 2003 Oct. 16).  E. Christensen, University of Arizona,
recognized 2002 LZ_11 as having cometary appearance yesterday in
CCD images (mag 16.6-16.9) obtained accidentally by the Catalina
Sky Survey (0.68-m f/1.8 Schmidt) on 2003 Oct. 29.  Further images
yesterday by Christensen apparently confirmed the cometary
appearance, as did images obtained today at the request of the
Minor Planet Center by J. Young (0.61-m reflector at Table Mountain
Observatory), who described the object as having a round coma, 7"
across, with a featureless fanshaped tail about 15"-20" long in
p.a. 190-280 degrees.

     2002 UT             R.A. (2000) Decl.       Mag.
     June  5.29966   17 47 23.52   -14 14 39.8   18.1

The following elliptical orbital elements by B. G. Marsden are from
69 observations (all published in MPSs) made during 2002 June 5-
2003 Nov. 2 (mean residual 0".7).  The ephemeris magnitudes assume
H_10 = 11.0.

                    Epoch = 2003 Mar. 22.0 TT
     T = 2003 Mar. 15.6630 TT         Peri. = 107.9740
     e = 0.351722                     Node  = 231.1424  2000.0
     q = 2.370483 AU                  Incl. =  11.5194
       a =  3.656582 AU    n = 0.1409584    P =   6.99 years

2003/04     R. A. (2000) Decl.   Delta     r    Elong. Phase   Mag.
Nov.  7     2 50.85   +18 21.1   1.812   2.802  177.5    0.9   16.8
     17     2 43.58   +17 05.0   1.855   2.833  169.5    3.6   16.9
     27     2 37.47   +15 54.3   1.927   2.865  157.7    7.5   17.0
Dec.  7     2 33.19   +14 54.6   2.025   2.897  146.3   10.9   17.2
     17     2 31.06   +14 09.0   2.146   2.929  135.4   13.6   17.3
     27     2 31.19   +13 38.6   2.286   2.962  125.1   15.8   17.5
Jan.  6     2 33.50   +13 23.0   2.440   2.995  115.3   17.3   17.7
     16     2 37.80   +13 20.5   2.604   3.028  106.1   18.2   17.9
     26     2 43.86   +13 29.0   2.775   3.062   97.4   18.6   18.1

                      (C) Copyright 2003 CBAT
2003 November 18               (8240)            Daniel W. E. Green

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