Central Bureau for Astronomical Telegrams
IAUC 4672: 1988N; 1987A; RW UMi; V482 Cyg
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Circular No. 4672
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 1988N IN ANONYMOUS GALAXY
A. V. Filippenko, University of California at Berkeley, reports
that R. J. Weymann, S. L. Morris, and S. F. Anderson (Mt. Wilson and Las
Campanas Observatories) obtained CCD spectra of SN 1988N (cf. IAUC 4601,
4630) on May 14 UT with the 5-m Hale reflector at Palomar Observatory.
The spectra, which cover the range 350-940 nm, reveal that SN 1988N was
probably of type Ia near maximum brightness. The redshift of the host
galaxy is roughly 0.08.
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
J. Reynolds, Mt. Stromlo Observatory; D. Campbell-Wilson,
Molonglo Observatory, Canberra; S. Gulkis, Jet Propulsion Laboratory;
and D. Jauncey, CSIRO Radiophysics, Sydney, write: "Upper limits to
the radio emission from SN 1987A have been determined at three
frequencies, using the NASA Interferometer at Tidbinbilla (Oct. 15),
and the Molonglo Observatory Synthesis Telescope, Canberra (Oct. 7).
On Oct. 15, the upper limits at 8420 MHz and 2290 MHz were 4.5 and 33
mJy, respectively; on Oct. 7, the upper limit at 843 MHz was about 2
mJy. The upper limits are 5-sigma values in each case."
RW URSAE MINORIS
S. Howell, Planetary Science Institute, writes: "This star was
considered a possible supernova by Kurkarkin (1962, IBVS 18) due to
its invisibility on plates (including the POSS) taken both before and
after outburst in 1956 (V about 5). CCD photometric observations taken
by S. B. Howell and T. J. Kreidl at Lowell Observatory on Oct. 17 and
18 UT show that the star is still present with a V mag of about
21-21.5. It is therefore likely that RW UMi is a nova with a very
large outburst amplitude (about 15 mag). Improved coordinates for this
star are R.A. = 16h49m59s, Decl. = +77 06'47" (equinox 1950.0).
Details and period information will be published elsewhere."
V482 CYGNI
Visual magnitude estimates (cf. IAUC 4617): July 4.1 UT, 13.2
(J. E. Bortle, Stormville, NY); 19.89, 13.6 (A. Boattini, Florence,
Italy); Aug. 4.96, 14.2 (E. Schweitzer, Strasbourg, France); 23.91,
13.9 (M. Verdenet, Bourbon-Lancy, France); Sept. 8.88, 13.8 (Verdenet);
19.02, 14.0: (A. Pereira, Cabo da Roca, Portugal); Oct. 31.80, [14.0
(Boattini).
1988 November 8 (4672) Daniel W. E. Green
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