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IAUC 5271: 1991ad; 1990i

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                                                  Circular No. 5271
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 or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


SUPERNOVA 1991ad IN ANONYMOUS GALAXY
     J. Mueller communicates:  "On a blue plate taken by J. D.
Mendenhall and myself on May 13 UT with the 1.2-m Oschin Telescope
in the course of the second Palomar Sky Survey, I have discovered a
supernova (mag 18.5) located in an anonymous galaxy at R.A. =
16h17m09s.7, Decl. = +17 45'56" (equinox 1950.0).  SN 1991ad is
11".4 east and 2" north of the galaxy's center.  A CCD frame taken
with the Palomar 1.5-m telescope by J. R. Mould on May 17 shows a
stellar image of mag 18.5 at this position.  N. Reid notes that the
object is not visible on a recent Sky Survey plate.  A spectrum
obtained by W. Baan and J. Salzer with the Hale 5-m telescope (+
double spectrograph) on May 21 shows broad absorption features at 570
and 615 nm, indicating a type-Ia supernova.  The redshift of the
galaxy is 20 900 km/s."


COMET TSUCHIYA-KIUCHI (1990i)
     Ephemeris from orbital elements on MPC 17595:

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     May  24     3 03.75    -10 08.5    4.241    3.443    14.0
     June  3     3 07.84    -10 14.1
          13     3 11.34    -10 31.2    4.286    3.656    14.3
          23     3 14.11    -11 00.1
     July  3     3 15.96    -11 40.9    4.246    3.867    14.5
          13     3 16.72    -12 33.9
          23     3 16.20    -13 38.9    4.150    4.073    14.7
     Aug.  2     3 14.20    -14 55.1
          12     3 10.54    -16 21.5    4.032    4.277    14.8
          22     3 05.06    -17 55.8
     Sept. 1     2 57.68    -19 34.7    3.939    4.477    15.0
          11     2 48.42    -21 13.8
          21     2 37.44    -22 47.8    3.923    4.674    15.2
     Oct.  1     2 25.10    -24 10.8
          11     2 11.92    -25 18.0    4.027    4.869    15.4
          21     1 58.55    -26 05.5
          31     1 45.64    -26 32.0    4.268    5.060    15.7
     Nov. 10     1 33.80    -26 38.0
          20     1 23.46    -26 25.8    4.634    5.249    16.0


1991 May 22                    (5271)             Daniel W. E. Green

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