Central Bureau for Astronomical Telegrams

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IAUC 5022: 1990K; 1990c; 1989c1

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                                                  Circular No. 5022
Central Bureau for Astronomical Telegrams
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

     R. Evans, Hazelbrook, N.S.W., reports his discovery on May
25.8 UT of a supernova in NGC 150 (R.A. = 0h31m.8, Decl. = -28 05',
equinox 1950.0).  K. Cooper and E. Sadler, Anglo-Australian Observatory,
measured the offset of the supernova from the galaxy center
as 18" west and 26" north.  The object (mag about 14) is situated
in a spiral arm of the galaxy; nothing appears at this position on
the ESO B survey photograph.

COMET LEVY (1990c)
     The following additional precise positions have been reported:

     1990 UT             R.A. (1950) Decl.        m1    Observer
     May  22.68912   23 55 40.62   +27 38 26.9    10    Otomo
          22.7486    23 55 42.50   +27 38 37.4            "
          22.75081   23 55 42.57   +27 38 38.9            "
          23.10278   23 55 54.61   +27 39 44.8          Maury

S. Otomo (Yamamoto).  0.20-m reflector.  Measured by M. Koishikawa.
  Communicated by J. Ossaka.
A. Maury and Q. Wang (Observatoire de la Cote d'Azur).  Schmidt
  telescope.  Measured by C. Pollas.

     J. Crovisier, Observatoire de Paris, Meudon; D. Despois,
Observatoire de Bordeaux; D. Bockelee-Morvan, Observatoire de Paris,
Meudon; G. Paubert, Institut de Radio Astronomie Millimetrique
(IRAM); and P. Colom, Centro Astronomico de Yebes, report:  "Hydrogen
sulfide (H2S) was detected in comet Austin through its 1(1,0)-
1(0,1) transition at 168.8 GHz with the IRAM 30-m telescope.  The
average line area was 0.21 +/- 0.03 K km sE-1 on May 23-25.  In
addition to the HCN J(1-0) transition (IAUC 5020), the HCN J(3-2)
line at 265.9 GHz was detected with an area of 1.30 +/- 0.17 K km
sE-1 on May 23-24.  All observed lines have widths between 1 and 2
km sE-1 and are centered on the comet rest velocity."
     Total visual magnitude estimates by A. Pearce, Scarborough, W.A.
(B = 20x80 binoculars; E = naked eye):  May 16.88 UT, 5.5 (B); 17.89,
5.4 (B; 1 deg tail in p.a. 254 deg); 19.89, 5.3 (B); 20.89, 5.0 (E);
21.89, 5.0 (E); 23.89, 5.0 (E); 24.89, 4.9 (E).

1990 May 25                    (5022)             Daniel W. E. Green

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