Central Bureau for Astronomical Telegrams
IAUC 5016: 1990J; 1989c1; RY Sgr; U Gem
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Circular No. 5016
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 1990J IN ANONYMOUS GALAXY
J. Mueller reports her discovery of a supernova in an
anonymous galaxy located at R.A. = 12h13m48s.2, Decl. = +12 48'18"
(equinox 1950.0). The supernova (mag about 18) is 7" west and 10"
north of the galaxy nucleus, and was found on a blue plate taken
May 13 UT with the 1.2-m Oschin Telescope in the course of the
Second Palomar Sky Survey. A spectrum obtained by M. Schmidt, D.
Schneider, J. Gunn, and R. Lucinio with the 5-m Hale reflector (+
4-shooter + spectrograph) on May 16 indicates that this is a
type-Ia supernova 10 to 20 days old.
COMET AUSTIN (1989c1)
U. C. Joshi, M. R. Deshpande, A. K. Sen, and J. S. Chauhan,
Physical Research Laboratory, Ahmedabad, report aperture polarimetry
obtained on May 2 and 4 using the PRL 1.2-m telescope (+ IHW filter
system + PRL polarimeter) at Gurushikhar Mt. Abu. Following are
given the degree of polarization and position angles in different
filter bands, as measured with an aperture of 100" diameter centered
on the nucleus. UC filter: May 2, 5.55 +/- 0.30 percent, 92 deg;
May 4, 0.97 +/- 0.81, 13 deg. CN filter: May 2, 6.25 +/- 0.19, 24
deg; May 4, 5.95 +/- 0.40, 18 deg. C3 filter: May 2, 3.46 +/- 0.36,
20 deg; May 4, 2.75 +/- 0.56, 22 deg. CO+ filter: May 2, 7.18 +/-
0.41, 25 deg. BC filter: May 2, 10.45 +/- 0.25, 23 deg; May 4,
7.04 +/- 0.55, 21 deg. C2 filter: May 2, 6.47 +/- 0.11, 21 deg;
May 4, 6.41 +/- 0.17, 16 deg. RC filter: May 2, 20.43 +/- 1.5, 26
deg; May 4, 18.17 +/- 1.25, 18 deg. H2O+ filter: May 2, 14.56 +/-
1.19, 27 deg; May 4, 13.77 +/- 1.10, 16 deg.
RY SAGITTARII
Visual magnitude estimates by A. Pearce, Scarborough, W.
Australia (cf. IAUC 4999): Apr. 25.80 UT, 8.0; 26.84, 8.5; 29.85,
8.5; May 1.83, 8.6; 5.90, 8.7; 6.87, 8.7; 15.88, 10.4; 16.87, 10.5;
17.88, 10.6.
U GEMINORUM
Visual magnitude estimates (cf. IAUC 4996): Apr. 18.82 UT,
10.0 (P. Schmeer, Bischmisheim, West Germany); 20.84, 10.7 (Schmeer);
21.87, 11.9 (Schmeer); 22.85, 12.6 (Schmeer); 25.88, 14.1 (A.
Boattini, Florence, Italy).
1990 May 18 (5016) Daniel W. E. Green
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