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IAUC 8256: MARS; V838 Mon; C/2002 T7

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                                                  Circular No. 8256
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)


MARS
     D. C. Parker, Coral Gables, FL, writes that CCD images taken
on Dec. 13 UT show that a large regional dust storm has broken out
on Mars.  A bright dust cloud covers most of the Chryse Planitia
and extends west into Candor; most of Aurorae Sinus is obscured.
In addition, the dust cloud has extended south into Eos and
Margaritifer Sinus.  Secondary clouds are seen over Bosporos Planum
and northern Argyre and possibly Aram Chaos (on the evening limb).
The dimensions of the main cloud are estimated to be about 3000 km
east-west and about 1800 km north-south.


V838 MONOCEROTIS
     M. Mikolajewski and T. Tomov write that the additional star
close to the position of V838 Mon, reported on IAUC 8253, is not a
real object.  Most probably it is an artifact caused by the
extremely red color of the star in combination with a red leak in
the U filter, shifted by the differential atmospheric refraction.
The two images lie almost along the parallactic angle, and their
shift of about 1" agrees with the predicted shift (e.g., Filippenko
1982, PASP 94, 715).


COMET C/2002 T7 (LINEAR)
     Extension to ephemeris on IAUC 8196 (elements MPC 50354):

2003/04     R. A. (2000) Decl.   Delta     r    Elong. Phase    Mag.
Dec.  7     2 40.38   +35 06.6   1.575   2.471  148.7   12.0    9.4
     17     1 59.59   +31 52.5   1.562   2.335  131.7   18.3    9.2
     27     1 25.81   +28 04.0   1.600   2.197  114.4   24.1    9.1
Jan.  6     1 00.17   +24 20.6   1.673   2.056   98.1   28.3    9.0
     16     0 41.67   +21 05.4   1.763   1.913   83.1   30.7    8.8
     26     0 28.73   +18 25.4   1.854   1.766   69.4   31.4    8.7
Feb.  5     0 19.80   +16 17.9   1.934   1.617   56.6   30.6    8.5
     15     0 13.61   +14 36.3   1.991   1.465   44.7   28.3    8.2
     25     0 09.15   +13 13.5   2.017   1.311   33.5   24.6    7.9
Mar.  6     0 05.60   +12 01.8   2.004   1.156   22.8   19.5    7.5
     16     0 02.30   +10 52.9   1.943   1.002   13.4   13.3    6.9

                      (C) Copyright 2003 CBAT
2003 December 14               (8256)            Daniel W. E. Green

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