Central Bureau for Astronomical Telegrams
IAUC 4871: 1989R; RADIO EMISSION FROM THE REGION OF GX 1+4; N Sct 1989
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Circular No. 4871
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 1989R IN UGC 2912
J. Mueller reports her discovery with C. Brewer on Oct. 4 UT
of a supernova in UGC 2912 (R.A. = 3h56m12s, Decl. = +42 29.0,
equinox 1950.0) during the course of the second Palomar Sky Survey
with the 1.2-m Oschin Schmidt Telescope. The supernova (estimated
red magnitude 15) is located 10" west and 10" north of galaxy's
center. A spectrum obtained by J. Mould and J. Nemec at the Hale
5-m reflector (+ 4-shooter + spectrograph) on Oct. 5 shows H-alpha
emission, indicating a type-II supernova.
RADIO EMISSION FROM THE REGION OF GX 1+4
R. K. Manchanda, University College, Australian Defence Force
Academy, University of New South Wales, Canberra, writes: "I have
discovered two weak radio sources close to the position of the
optical candidate of GX 1+4. The observations were made on Aug.
26 using the Molonglo Observatory Synthesis Telescope operating at
843 MHz. The two sources have the following approximate centroid
positions (equinox 1950.0) and radio fluxes: (1) R.A. = 17h28m44.6,
Decl. = -24 44'05", about 70 mJy; (2) R.A. = 17h29m15s, Decl. =
-24 40.9, about 12 mJy. Source (1) is only about 3' away from
the optical candidate and lies within the position error box of
the x-ray source from UHURU and OSO-7 satellite surveys, but is
inconsistent with the Copernicus position error circle. The
radio sources are not seen in any previous surveys; this is
probably due to the higher threshold sensitivity (about 1 Jy) of
these surveys. Close to the position of source (1), a star is
present only on the blue Palomar survey plates. In view of the
anomalous behavior of GX 1+4 in the past decade, further spectral
and temporal investigations --- both in the radio and the optical
bands --- are urgently required for source (1), to establish a
possible association. I thank J. G. Robertson and the Molonglo
Observatory staff for making the observation and synthesis map."
NOVA SCUTI 1989
Visual magnitude estimates (cf. IAUC 4868): Sept. 28.46 UT,
10.2 (P. F. Williams, Heathcote, N.S.W); 29.90, 9.6 (P. Schmeer,
Bischmisheim, West Germany); Oct. 1.42, 9.7 (T. Kato, Kyoto, Japan);
2.11, 9.9 (P. Collins, Scottsdale, AZ); 2.87, 9.5 (A. Pereira, Cabo
da Roca, Portugal); 4.11, 9.3 (T. Benner, Perkasie, PA); 4.86, 9.8
(A. Boattini, Florence, Italy).
1989 October 5 (4871) Daniel W. E. Green
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