Central Bureau for Astronomical Telegrams
IAUC 2998: SN IN NGC 488; N Vul 1976; HR 1099 AND UX Ari
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 2999
Circular No. 2998
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
SUPERNOVA IN NGC 488
B. Szeidl, Konkoly Observatory, cables that M. Lovas has
discovered a supernova 2" west and 111" south of the nucleus of NGC
488. On Oct. 21 the photographic magnitude was 15.0.
NOVA VULPECULAE 1976
C. Y. Shao, Center for Astrophysics, has derived the following
average position from a pair of exposures by R. E. McCrosky with
the Harvard Observatory's 155-cm reflector: R.A. = 19h21m04s.06, Decl. =
+20o21'43".3 (equinox 1950.0). He notes that the position corresponds
with that of a blue star, of photographic magnitude 18.3, on
the Palomar Sky Survey. Other stars appear nearby on the red Survey
print, but none is within 7" of the position of the nova.
J. C. Kemp, R. J. Rudy and I. G. Nolt, Department of Physics,
University of Oregon, report polarization measurements as follows:
1976 UT B filter V filter
Oct. 23.25 3.36 percent in p.a. 7o2 3.45 percent in p.a. 7o5
24.15 3.41 " 11.6 3.64 " 8.9
The polarization seems to be essentially interstellar. The star 7
Vul, 12' south of the nova, shows polarization 0.51 percent in p.a.
10o (B filter). In view of the similar position angles, and assuming
a linear dependence of polarization on distance, Kemp et al.
deduce that the nova is at a distance of 1800 pc (this probably
being an upper limit).
An independent discovery of the nova, apparently on Oct. 22.8
UT, has been reported by K. J. O'Brien and E. J. Ansbro, Dublin.
Visual magnitude estimates reported by T. E. Schmidt, Tiara
Observatory, Colorado Springs: Oct. 23.17 UT, 6.7; 24.18, 7.2.
HR 1099 AND UX ARIETIS
R. L. Mutel, Department of Physics and Astronomy, University
of Iowa, writes that strong circular polarization has been detected
at 1.4 GHz in these RS CVn binary systems (cf. IAUC 2972). Observations
at Arecibo Observatory show that HR 1099 was 35-percent left-hand
polarized on Sept. 26 and UX Ari approximately 15-percent
right-hand polarized on Sept. 24, 25 and 26.
1976 October 26 (2998) Brian G. Marsden
Read IAUC 2999
Our Web policy. Index to the CBAT/MPC/ICQ pages.
