Central Bureau for Astronomical Telegrams
IAUC 5458: 1992G; W Com; 1992 AD
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Circular No. 5458
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 1992G IN NGC 3294
T. Iijima, M. Turatto, and E. Cappellaro, Asiago Observatory,
report: "A spectrogram (resolution about 1 nm) of SN 1992G was
obtained with the 1.82-m telescope (+ Boller & Chivens spectrograph +
CCD) on Feb. 21.04 UT. Preliminary inspection of the spectrum
reveals this object to be a type-Ia SN in proximity of maximum. In
fact, at about 618 nm is seen the deep absorption usually attributed
to Si II (635.5 nm), from which is derived an expansion velocity of
10 000 km/s. Other absorption features are measured at 580, 550,
and 532 nm."
Y. Kushida, Yatsugatake South Base Observatory, Japan, reports
the following improved position for SN 1992G (cf. IAUC 5452),
forwarded by H. Kosai, National Astronomical Observatory, Tokyo: R.A.
= 10h33m26s.25, Decl. = +37 34'49".9 (equinox 1950.0). On Feb.
16.677 UT, mpv = 13.9.
Visual magnitude estimates: Feb. 21.85 UT, 12.7 (P. Pujol,
Madrid, Spain); 22.90, 12.7 (Pujol); 22.957, 13.2 (M. Villi and G.
Cortini, Mt. Colombo, Italy); 23.95, 12.8 (J. Ripero, Madrid, Spain).
W COMAE BERENICES
E. Massaro, R. Nesci, and G. C. Perola, Astronomical Institute,
Rome University; and D. Lorenzetti and L. Spinoglio, Istituto Fisica
dello Spazio Interplanetario, CNR, Frascati, communicate: "We
observed the BL Lac object ON 231 (W Com) with the TIRGO telescope on
Gornergrat Mountain. From a literature search, the object is at its
highest brightness level observed since 1972. Johnson magnitudes
were as follows on Feb. 2: B = 15.11 +/- 0.03, V = 14.59 +/- 0.04;
K = 11.31 +/- 0.02. No significant flux variations were detected
over six days. Further observations of this source are encouraged."
1992 AD
M. Hoffmann writes that preliminary reduction of CCD photometry
of 1992 AD taken by U. Fink, M. Hoffmann, W. Grundy, M. Hicks, and
W. Sears during the nights of Jan. 30 and 31 UT with the University
of Arizona Catalina 1.54-m telescope has resulted in a light curve
which is in rough agreement with the 0.42 days reported on IAUC
5451, Buie et al., but suggests that the period may be slightly
longer (about 0.55 days). The amplitude is roughly 0.2 magnitude.
1992 February 24 (5458) Daniel W. E. Green
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