Central Bureau for Astronomical Telegrams
IAUC 5571: 1992an; N Cyg 1992; 1991a1
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Circular No. 5571
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)
SUPERNOVA 1992an IN ANONYMOUS GALAXY
J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery by R. Antezana (
University of Chile) of a supernova (mpg about 18) located about 6".5
east and 5".5 north of the nucleus of a spiral galaxy at R.A. =
13h34m59s, Decl. = -30 26'.2 (equinox 1950.0). The supernova was
found on a 20-min unfiltered IIa-O plate taken by L. Wells and C.
Muena (CTIO) with the CTIO Curtis Schmidt telescope on July 26.021
UT. Confirmation was made by N. Tyson (Princeton University) and
R. Gal (Columbia University) on B and V images obtained on July
30.02 with the CTIO 0.9-m telescope. On July 29.01, M. Phillips
(CTIO) and A. Alonso (Columbia University) used the CTIO 4-m
telescope to obtain a spectrogram (range 320.0-750.0 nm) that shows
this object to be a peculiar type-II supernova with narrow (FWHM
about 900 km/s) H-alpha, H-beta, and H-gamma emission lines atop an
essentially featureless continuum. The redshift of the H-alpha and
H-beta lines is 0.051.
NOVA CYGNI 1992
Photoelectric photometry (+/- 0.05 unless otherwise noted)
reported by D. H. Kaiser, Columbus, OH (K); G. Emerson, E. E. Barnard
Observatory (E); and D. Hanzl and E. Neureiterova, N. Copernicus
Planetarium Observatory, Brno (H): June 26.150 UT, V = 8.99 +/-
0.02 (K); 28.151, V = 9.02 +/- 0.02, B-V = -0.36 +/- 0.01 (K);
28.385, 9.33 +/- 0.06, - (E); 29.909 UT, V = 9.32 +/- 0.03, B-V =
-0.62, U-B = -0.72 (H); July 1.015, 9.25 +/- 0.02, -0.61 +/- 0.04,
-0.66 (H); 1.909, 9.27 +/- 0.02, -0.61 +/- 0.04, -0.67 (H); 8.875,
9.36 +/- 0.03, -0.62 +/- 0.04, -0.68 +/- 0.04 (H); 9.914, 9.43 +/-
0.02, -0.63, -0.73 +/- 0.07 (H); 13.907, 9.43 +/- 0.04, -0.63,
-0.76 (H); 19.156, 9.19 +/- 0.01, -0.36 +/- 0.01, - (K). Kaiser
and Hanzl both used the comparison star HD 195664.
COMET SHOEMAKER-LEVY (1991a1)
Selected total visual magnitude estimates (cf. IAUC 5554):
July 6.93 UT, 7.8 (G. M. Hurst, Basingstoke, England, 15x80
binoculars); 13.88, 7.4 (A. Boattini, Florence, Italy, 0.33-m
reflector); 18.92, 7.8 (V. F. de Assis Neto, Sao Francisco de Oliveira,
Brazil, 10x70 binoculars); 21.88, 7.2 (A. Mizser, Budapest,
Hungary, 20x60 binoculars); 22.88, 7.9 (S. Garro, Merlette, France,
12x80 binoculars).
1992 July 31 (5571) Daniel W. E. Green
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