Central Bureau for Astronomical Telegrams
IAUC 3371: SN IN NGC 4301; 1977 HA
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Circular No. 3371
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 617-864-5758
SUPERNOVA IN NGC 4301
L. Rosino, Asiago Astrophysical Observatory, writes that spectra
obtained with the Asiago 182-cm telescope by F. Ciatti, S.
Ortolani, P. Rafanelli and himself (see also IAUC 3361) during the
second half of May clearly show the typical structure of a type-II
supernova. The Balmer lines from H-alpha to H-delta appear very wide in
emission (halfwidths from 6800 to 5400 km/s) and are accompanied by
diffuse P-Cyg absorptions giving mean velocities from -8600 to -7000
km/s). Besides the Balmer lines, emission bands with shortward
diffuse absorptions have been observed at 5890, 5000 and 4700-4600 A,
the last very likely being the blend of a pair of broad emission
lines centered at 4670 and 4630 A. From 5700 to 5160 A there is a
very long emission, with little structure, probably due to the
blend of a series of emission bands. The lightcurve in B and V is
also typical of SNe-II (cf. Barbon et al. 1979, Astron. Astrophys.
72, 287). Using de Vaucouleurs' comparison sequence the following
magnitudes have been derived from Asiago Schmidt plates: Apr. 20.9
UT, 12.05B; 22.9, 12.15B, 12.05V; May 2.9, 12.75B, 12.30V; 3.9,
12.55B, 12.40V; 18.9, 13.39B, 12.90V; 19.9, 13.30B, 12.80V; 22.9,
13.75B, 12.95V; 23.9, 13.80B, 12.80V.
1977 HA
C. T. Kowal, Hale Observatories, has recovered this Apollo-type
object on exposures with the Palomar 122-cm Schmidt telescope.
Positions have been measured by S. J. Bus as follows:
1979 UT R. A. (1950) Decl. Mag.
June 1.29028 13 06 43.93 +25 42 01.0 19
2.28194 13 08 45.09 +25 25 03.7 19
The indicated correction to the ephemeris on MPG 4665 is Delta-T = -1.3
days. The following ephemeris is based on new orbital elements by
B. G. Marsden that link the 1977 and 1979 observations:
1979 ET R. A. (1950) Decl. Delta r Mag.
June 21 13 42.18 +20 09.0
26 13 50.21 +18 46.6 1.014 1.588 20.4
July 1 13 58.09 +17 25.4
6 14 05.85 +16 05.5 1.156 1.655 20.8
1979 June 21 (3371) Brian G. Marsden
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