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IAUC 8500: Poss. N IN Sgr; 2005ay; C/1997 B4

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                                                  Circular No. 8500
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)


POSSIBLE NOVA IN SAGITTARIUS
     S. Nakano, Sumoto, Japan, reports the independent discoveries
of a possible nova by Hideo Nishimura (Kakegawa, Shizuoka-ken,
Japan; Pentax 6x7 camera + 200-mm f/4.0 lens + Kodak T-Max film,
two exposures; new object at mag 8.7 on Mar. 28.779 UT) and by
Yukio Sakurai (Mito, Ibakaki-ken, Japan; two CCD frames taken with
a Fuji 'Fine Pix S2' digital camera + Nikon 180-mm f/2.8 lens; new
object at mag 9.1 on Mar. 28.796).  Nakano provides his measurement
for the position of the new object from Sakurai's jpeg image:  R.A.
= 18h16m59s.04, Decl. = -25o56'38".8 (equinox 2000.0).  Nothing was
visible at this location on Sakurai's CCD frames taken on Mar. 19,
20, and 25 (limiting mag 11.8).  H. Yamaoka, Kyushu University,
notes that nothing is visible at this location on an ASAS-3 image
taken on Mar. 27.464 (limiting mag about 14), adding that there is
a bright infrared source in the 2MASS catalogue with position end
figures 58s.67, 39".0.


SUPERNOVA 2005ay IN NGC 3938
     D. Rich, Hampden, ME, reports his discovery of an apparent
supernova (mag about 15.6) on unfiltered CCD frames taken with a
0.31-m reflector on Mar. 27.08 and 27.99 UT.  The new object is
located at R.A. = 11h52m48s.07, Decl. = +44o06'18".4 (equinox
2000.0), which is about 15" west and 56" south of the center of NGC
3938.  Nothing is visible at this location on CCD frames taken by
Rich on Feb. 2.18 and 27.16 (limiting mag about 18.6) or on Palomar
Digital Sky Survey images from 1997 (limiting red mag 20.0) and
1990 (limiting blue mag 19.5).


COMETS C/1997 B4 (SOHO) AND C/1997 V7 (SOHO)
     The initial observations are given below for two additional
comets found on archival SOHO website images (continuation to IAUC
8499).  These objects do not belong to recognized groups, and their
orbits (although uncertain) appear to be retrograde.

 Comet       1997 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/1997 B4   Jan. 21.240   20 02.8  -22 36   C3    RK   2005-F31
 C/1997 V7   Nov.  2.529   14 26.8  -11 03   C3    RK   2005-F31

                      (C) Copyright 2005 CBAT
2005 March 29                  (8500)            Daniel W. E. Green

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