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IAUC 5629: 1992 SL; 1992bb

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                                                  Circular No. 5629
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


1992 SL
     E. F. Helin and K. Lawrence found another fast-moving asteroidal
object on films taken Sept. 24 by Helin, Lawrence, J. Alu,
and P. Rose with the Palomar 0.46-m Schmidt.  Orbital elements from
MPC 20935:

     T = 1992 Sept. 5.320 TT          Peri. = 344.545
     e = 0.32796                      Node  =   1.086   2000.0
     q = 1.09123 AU                   Incl. =   8.476
       a =  1.62377 AU     n = 0.476339     P =   2.07 years

1992 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    V
Oct.  5     1 35.60   +27 28.7   0.138   1.126  154.3   22.7   14.5
     10     1 31.78   +31 10.2   0.153   1.138  154.6   22.1   14.8
     15     1 27.97   +33 51.3   0.169   1.152  154.7   21.7   15.0
     20     1 24.56   +35 41.9   0.187   1.167  154.4   21.6   15.2
     25     1 21.88   +36 51.8   0.207   1.184  153.9   21.7   15.5
     30     1 20.24   +37 29.7   0.229   1.201  153.0   22.0   15.8
Nov.  4     1 19.84   +37 43.8   0.252   1.220  151.8   22.6   16.0
      9     1 20.70   +37 40.7   0.278   1.240  150.2   23.4   16.3
     14     1 22.78   +37 25.7   0.306   1.260  148.3   24.4   16.6


SUPERNOVA 1992bb IN IRAS 21156-0747
     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a supernova (B about 17.5) in the nearly-edge-on spiral
galaxy IRAS 21156-0747.  The discovery plate was taken on Sept.
30.5 UT by M. J. Drinkwater with the U.K. Schmidt Telescope.  A U
plate taken by Drinkwater 45 min earlier shows the supernova
marginally brighter with respect to nearby stars.  The supernova is
not present on Sept. 2.5 to a limit of I = 19.5 on a UKST plate
taken by A. Savage, but it appears at mag about 18 on Sept. 27.4 on
a UKST prism film taken by Drinkwater and K. M. Sealey (University
of New South Wales).  Drinkwater notes that the spectrum shows two
emission lines, possibly [O III] at 495.9 and 500.7 nm.  Coordinates
measured from the B plate are R.A. = 21h15m35s.18, Decl. =
-7 47'42".5 (equinox 1950.0, uncertainty 0".4 in each coordinate),
offset 19" west and 4" north from the galaxy's center.  No star
appears in the position of the supernova on J or R survey films.  A
nearby star of mag 17 has end figures 32s.11, 47".6.


1992 October 6                 (5629)            Daniel W. E. Green

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