Central Bureau for Astronomical Telegrams
IAUC 4646: 1988R; RY Sgr; 3C 446
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Circular No. 4646
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1988R IN MCG 9-23-9
B. Szeidl, Konkoly Observatory, telexes the discovery by M. Lovas
of a supernova in MCG 9-23-9 (R.A. = 13h46.4, Decl. = +55 03',
equinox 1950.0). A plate exposed Aug. 18.87 UT shows the object
(mpg = 15.5) at 7" east and 3" north of the galaxy's center.
A. V. Filippenko, University of California at Berkeley, reports:
"A spectrum (range 440-750 nm, resolution 1.5-2 nm) of SN 1988R was
obtained on Aug. 23 UT by V. T. Junkkarinen, University of
California at San Diego, with a Cassegrain CCD spectrograph on the
Shane 3-m reflector at Lick Observatory. A verbal description of
the spectrum confirms that the object is a supernova, probably of
type Ia near maximum brightness."
RY SAGITTARII
F. Bateson, Royal Astronomical Society of New Zealand, reports
that A. Jones, Nelson, has detected a fading of this R CrB-type star
(at mv = 7.2 on Aug. 22.34 UT). Photoelectric photometry by A. C.
Gilmore and P. M. Kilmartin, Mt. John University Observatory: Aug.
6.42, V = 6.43, B-V = +0.68; Aug. 15.43, V = 6.73, U-B = +0.55,
B-V = +0.82, V-R = +0.52; Aug. 17.44, 6.78, +0.56, +0.84, +0.53; Aug.
22.38, 6.82, +0.56, +0.81, +0.51; Aug. 23.44, 6.82, +0.56, +0.81, +0.51.
3C 446
C. Barbieri, U. Munari, G. Romano, and M. Turatto, Asiago
Astrophysical Observatory, write: "We confirm (cf. IAUC 4640) that
this quasar is in a high-luminosity state. Three photographic plates
taken with the Asiago Schmidt telescope yield these B magnitudes:
Aug. 10.996 UT, 15.8; 12.932, 15.7; 17.903, 15.8. Studies are in
progress to analyze the available material for further evidence of
preferred timescales in the variability. A spectrum taken with the
1.82-m telescope on Aug. 18.951 in the region 420.0-530.0 nm does not
show prominent emission lines. There is one absorption at 491.7 nm
that does not appear in our spectra of 1983 (Barbieri et al. 1985,
A.Ap. 142, 316) and that we are unable to identify. There is evidence
for the Mg II 280.0-nm doublet and an uncertain suggestion of Fe II
at 258.6- to 259.9-nm, both in absorption at redshift z = 0.847."
G. Hurst, Basingstoke, England, reports that B. Manning,
Stakenbridge, found 3C 446 at mpv = 15.8 +/- 0.1 on Aug. 21.966 UT
(hypered Kodak 2415 film).
1988 August 23 (4646) Daniel W. E. Green
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