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IAUC 4346: 1986m; X-RAY N; 1987A

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IAUC number 

                                                  Circular No. 4346
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


PERIODIC COMET GRIGG-SKJELLERUP (1986m)
     Ephemeris from the orbital elements on MPC 10519:

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Apr.  5     6 03.32    - 0 13.9
          15     6 21.71    + 1 40.5    1.191    1.316    15.7
          25     6 44.02    + 3 32.0
     May   5     7 10.37    + 5 19.9    1.120    1.164    14.7
          15     7 40.92    + 7 03.6
          25     8 15.90    + 8 42.5    1.023    1.049    13.9
     June  4     8 55.49    +10 14.5
          14     9 39.68    +11 35.1    0.926    0.995    13.3
          24    10 28.08    +12 36.6
     July  4    11 19.75    +13 08.0    0.868    1.018    13.3
          14    12 13.01    +12 59.9
          24    13 05.82    +12 08.6    0.884    1.111    13.9
     Aug.  3    13 56.28    +10 39.0
          13    14 43.10    + 8 43.3    0.989    1.251    14.9
          23    15 25.79    + 6 35.5
     Sept. 2    16 04.49    + 4 27.7    1.175    1.416    16.1

     T. A. Morley writes that this comet is currently considered
to be the most attractive candidate for the retargeting of the
GIOTTO spacecraft and therefore points out the need for extensive
and reliable astrometric observations.  Further information can be
obtained from him at the address: ESOC, Robert-Bosch-Str. 5, D-6100
Darmstadt, West Germany; telex (West Germany) 419453 ESOC D.


X-RAY NOVA
     R. H. McNaught, Siding Spring Observatory, reports that his
rather incomplete visual examination on Mar. 13 showed no obvious
change to mag 14 in the vicinity of the x-ray position given on
IAUC 4342.  Further, nothing unusual showed to mag 10 on patrol
films taken on four nights during 1986 Nov. 22-28 and to mag 11.5
on 35 nights between Dec. 5 and 1987 Mar. 12.


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     Further visual magnitude estimates: Mar. 14.44 UT, 4.3 (T.
Beresford, Adelaide, South Australia); 15.46, 4.3 (G. Garradd,
Tamworth, N.S.W.); 16.50, 4.0 (Beresford).


1987 March 16                  (4346)              Brian G. Marsden

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