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IAUC 8637: C/2004 YJ_35; 101P

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                                                  Circular No. 8637
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 C/2004 YJ_35 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
project (discovery observation below from MPEC 2005-A47 and MPS
124152) has been found by S. S. Sheppard to have a centrally
condensed coma with a tail about 1".5 wide and about 10" long in
p.a. 330 deg on CCD frames taken on Nov. 30.34 and Dec. 1.33 UT
with the Dupont 2.5-m reflector at Las Campanas (MPEC 2005-X12; T =
2005 Mar. 3, q = 1.78 AU, i = 52 deg, e = 0.9999).

     2004 UT             R.A. (2000) Decl.       Mag.
     Dec. 31.07192   21 09 18.11   +69 18 19.5   19.4


COMET 101P/CHERNYKH
     E. J. Christensen has found an object with a well-condensed
15" coma moving about 21'.5 ahead of what has been presumed to be
the primary component of comet 101P [corresponding to Delta(T) =
-0.9 day] on 90-s images taken with the Catalina Sky Survey 0.68-m
Schmidt telescope on Nov. 30.2 UT; his Dec. 2.2 images show a 15"
asymmetric coma elongated in p.a. 50 deg (the approximately 2.5-mag-
brighter component showing a 10" central condensation surrounded by
a 1' asymmetric coma also oriented in p.a. 50 deg).  Observations
with the Mt. Lemmon Survey 1.5-m reflector by A. D. Grauer and E. C.
Beshore on Dec. 1.2 show this fainter component to have a broad
10"-15" tail in p.a. about 57 deg.  The available astrometry is
provided below.  Following the reasoning by Sekanina (IAUC 5391),
it is unlikely that the companion observed in 1991 (IAUC 5347) has
survived.

     2005 UT             R.A. (2000) Decl.       Mag.   Observer
     Nov. 30.19707    0 19 57.46   - 4 57 00.8   17.8   Christensen
          30.20586    0 19 57.82   - 4 56 58.5   17.9     "
          30.21450    0 19 58.15   - 4 56 55.7   18.3     "
          30.22309    0 19 58.44   - 4 56 51.7   18.2     "
     Dec.  1.23064    0 20 36.93   - 4 50 52.2   17.9   Grauer
           1.23152    0 20 36.97   - 4 50 51.8   18.1     "
           1.23241    0 20 36.99   - 4 50 51.4   18.2     "
           1.23329    0 20 36.95   - 4 50 51.9            "
           2.20865    0 21 15.62   - 4 44 53.9   17.9   Christensen
           2.21893    0 21 15.98   - 4 44 49.8   18.3     "
           2.22922    0 21 16.45   - 4 44 46.3   18.1     "
           2.23962    0 21 16.81   - 4 44 43.0   17.8     "

                      (C) Copyright 2005 CBAT
2005 December 2                (8637)            Daniel W. E. Green

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