Central Bureau for Astronomical Telegrams
IAUC 3309: SN IN IC 5201; HEAO 2; H 2155-304
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Read IAUC 3310
Circular No. 3309
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 617-864-5758
SUPERNOVA IN IC 5201
M. J. Ward, Institute of Astronomy, University of Cambridge;
J. C. Blades, Anglo-Australian Observatory; and R. E. Griffiths,
Center for Astrophysics, report the discovery of a supernova in IC
5201 on Nov. 24.5 UT. Spectroscopic observations using the 190-cm
reflector at Mount Stromlo Observatory indicate it to be of type II,
In an early stage of development, with H-alpha and H-beta emission
(expansion ~ 20 000 km/s), and to have an apparent magnitude from a
red-sensitive television finder of 13.5. Spectral features and the
magnitude showed no significant changes over the four-night monitoring
period Nov. 24.5 to 27.5 UT. The supernova is located 1'.6
west and 0'.7 north of the nucleus of the galaxy.
HEAO 2
On behalf of the Scientific Consortium, R. Giacconi informs us
that the Einstein ObservatorY (HEAO 2) was successfully launched on
Nov. 13d05h24m UT. The orbit is circular and nominal: Incl. = 23o.5, P
= 95 min, altitude = 535 km. All instrumentation has been activated,
and backgrounds and performance are nominal. The spacecraft
is pointing and maneuvering well. Only the high-resolution imager
(HRI) has been at the telescope focus. Bright sources have been
observed, and the images are as expected. Observatory activation
will take two months: each instrument will be at the focus for two
weeks. The planned observing program, including Guest Observations,
is expected to start during the first week of 1979 Jan. Details
concerning the instruments and the observing program can be obtained
by writing to F. Seward at the address: Center for Astrophysics,
60 Garden Street, Cambridge, MA 02138, U.S.A.
H 2155-304
R. M. Hjellming, National Radio Astronomy Observatory; and
H. W. Schnopper and J. M. Moran, Center for Astrophysics, report
that they observed the new x-ray source H 2155-304 (cf. IAUC 3279)
on Nov. 18 with the Very Large Array. They found a point radio
source having an angular size of less than 0".3 at the position
R.A. = 21h55m58s.37 +/- 0s.7, Decl. = -30o27'54" +/- 3" (equinox 1950.0),
which is well within the error bars of the x-ray source. The flux densities
at 1465, 4885 and 14 765 MHz are 0.28 +/- 0.02, 0.26 +/- 0.01 and 0.20
+/- 0.04 Jy, respectively.
1978 November 29 (3309) Brian G. Marsden
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