Central Bureau for Astronomical Telegrams
IAUC 4734: 1989C, 1989D; 1989 AC
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Read IAUC 4735
Circular No. 4734
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
SUPERNOVAE 1989C AND 1989D
A. V. Filippenko, University of California at Berkeley, communicates:
"Spectra (range 390-810 nm; resolution 1.5-2 nm) of SN 1989C
and SN 1989D (IAUC 4730) were obtained by M. Dickinson and A. Dey,
also of Berkeley, on Feb. 7 UT with a Cassegrain CCD spectrograph
on the Shane 3-m reflector at Lick Observatory. A verbal description
of the spectra shows that SN 1989C is a peculiar type-II object;
prominent, broad hydrogen Balmer emission lines are present, as is
Na I/He I at 589 nm, but the corresponding absorption lines are weak
or absent. The supernova is surrounded by H II regions. Judging
from the presence of the Si II absorption line at 635.5 nm and other
features, SN 1989D in NGC 2963 is a type-Ia object, probably within 1-2
weeks of maximum brightness."
R. Kirshner, Center for Astrophysics, reports that J. Huchra and
A. Zabludoff, using the Whipple Observatory Multiple Mirror Telescope
and 1.5-m reflector, respectively, obtained spectra on Feb. 7 UT
that show SN 1989D in NGC 2963 to be a type-Ia supernova.
1989 AC
Orbital elements from MPC 14204:
T = 1988 Nov. 22.6040 ET Peri. = 274.9901
e = 0.639804 Node = 127.1834 1950.0
q = 0.900206 AU Incl. = 0.4650
a = 2.499213 AU n = 0.2494589 P = 3.951 years
1989 ET R.A. (1950) Decl. Delta r V
Feb. 13 6 44.23 +23 05.7 0.533 1.422 15.8
18 6 54.30 +22 57.1
23 7 03.73 +22 46.3 0.667 1.512 16.5
28 7 12.71 +22 33.7
Mar. 5 7 21.38 +22 19.4 0.813 1.603 17.0
10 7 29.84 +22 03.4
15 7 38.16 +21 45.8 0.971 1.692 17.6
20 7 46.37 +21 26.6
25 7 54.49 +21 06.0 1.138 1.780 18.0
30 8 02.54 +20 43.8
Apr. 4 8 10.54 +20 20.3 1.314 1.867 18.4
1989 February 7 (4734) Daniel W. E. Green
Read IAUC 4735
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