Central Bureau for Astronomical Telegrams
IAUC 3942: SN IN Anon GALAXY; LSS 2018; 1983w
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Circular No. 3942
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 IN ANONYMOUS GALAXY
J. Maza, Department of Astronomy, University of Chile, telexes
that L. E. Gonzalez at Cerro El Roble has found a supernova 2"
and 8" south of the center (R.A. =10h27m1, Decl. = -26deg12', equinox
1950.0) of an anonymous galaxy. The supernova was reported at mpg
= 18.5 on Mar. 27, and at mpg ~ 10 [sic] on May 5.
LSS 2018
J. S. Drilling, Department of Physics and Astronomy, Louisiana
State University, reports: "LSS 2018 (cf. IAUC 3939) shows
C III 464.7, 465.0, and 465.1-nm emission that varies in both
radial velocity and intensity. Preliminary analysis of 21 high-
resolution spectra obtained at Cerro Tololo on Apr. 13 and 14
indicates a sinusoidal variation in radial velocity, with a range of
280 to 300 km/s, which is 90 deg ahead of the 8.57-hr brightness
variation and 180 deg out-of-phase with the velocity variation of the
He II 468.6-nm absorption line. The intensity of the C III
emission is much stronger for decreasing than for increasing radial
velocity. All observations obtained to date are consistent with
LSS 2018's being a close binary, consisting of a subluminous O-
type star (which produces the absorption-line spectrum and illuminates
the nebula) with a mass of 0.5-0.6 M-Sun and a cooler companion
with a mass one-half that of the primary (whose heated hemisphere
causes the brightness variations and produces the C III emission)."
NSV 2229
M. Verdenet, Bourbon-Lancy, France, communicates the following
visual magnitude estimates of the object reported by Chanal
(IAUC 3924, 3935): Jan. 24.9 UT, 14.2; 28.9, 14.3; Feb. 18.8,
14.6; 23.8, 14.5; Mar. 6.8, 13.8; 21.8, 14.5; 25.8, 14.6.
D. di Cicco, Sky and Telescope, informs us that this object
appears at nearly constant brightness (mag 13.2) on 20 exposures he
made of M42 from 1983 Oct. 15 to 1984 Mar. 10, but not on exposures
taken in 1983 Jan.
PERIODIC COMET CLARK (1983w)
The following total visual magnitudes estimates have been
reported: May 6.47 UT, 11.1 (A. Hale, Frazer Park, CA, 0.20-m refl.);
7.46, 11.0 (C. Morris, Angeles Crest Highway, CA, 0.25-m refl.).
1984 May 9 (3942) Daniel W. E. Green
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