Central Bureau for Astronomical Telegrams
IAUC 5022: 1990K; 1990c; 1989c1
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Read IAUC 5023
Circular No. 5022
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 1990K IN NGC 150
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.
COMET AUSTIN (1989c1)
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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