Central Bureau for Astronomical Telegrams
IAUC 4375: 1987G; 1987C, 1987D; 1986l
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Circular No. 4375
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 617-495-7244/7440/7444
SUPERNOVA 1987G IN UGC 7370
J. Mould and R. Day report their discovery of a magnitude 15
supernova in UGC 7370 (MCG +0-32-01; R.A. = 12h17.2, Decl. = +2 22',
equinox 1950.0) on a plate exposed Apr. 25.25 UT with the 1.2-m Schmidt
telescope during the course of the second Palomar Sky Survey. The
supernova is located about 30" from the center of the galaxy along the
southeast semimajor axis (p.a. 151 deg). Observations on Apr. 26 by
J. Gunn, M. Schmidt, and D. Schneider with the 5-m Hale telescope
(+ 4-shooter) indicate no noticeable magnitude change in one day
and also that the object has a possible type-I SN spectrum.
SUPERNOVAE 1987C AND 1987D
R. P. Kirshner and E. M. Schlegel, Center for Astrophysics,
report that spectra, obtained by J. Huchra and R. C. Smith at the
Multiple Mirror Telescope, of SN 1987C (IAUC 4358, 4368) and SN
1987D (IAUC 4370) show that SN 1987C is an old type-II object,
while SN 1987D is type I.
COMET WILSON (1986l)
J. R. Ducati and R. D. D. Costa, Instituto de Fisica, Porto
Alegre, telex: "We report photoelectric photometry of comet Wilson
on Apr. 23.38, 24.39, and 25.40 UT with the Lowell 0.61-m telescope
(with diaphragms of 50", corresponding to about 25 000 km at the comet,
100", and 150" aperture) at Cerro Tololo Interamerican Observatory.
In this period, we detected an increase in CO+ emission, given by
the intensity ratio (CO+ 426 nm)/(continuum 365 nm), of 35 percent
in the outer coma, and emission from C2, (C2 514 nm)/(continuum 485
nm), also increased outwards by 80 percent. Emissions from C3 and
H2O+ have constant strength over the observed regions."
Total visual magnitude estimate by V. F. de Assis Neto, Sao
Francisco de Oliveira, Brazil (naked eye): Apr. 27.00 UT, 4.8.
G. Garradd, Tamworth, N.S.W., reports a tail disconnection on
photographs obtained Apr. 20.8.
COMET SORRELLS (1986n)
Total visual magnitude estimates: Feb. 18.14 UT, 8.9 (C. S.
Morris, Whitaker Peak, CA, 0.26-m reflector); Apr. 23.48, 9.8 (A.
Hale, Las Cruces, NM, 0.20-m reflector).
1987 April 27 (4375) Daniel W. E. Green
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