Central Bureau for Astronomical Telegrams
IAUC 4984: 1989e1; 1990G, 1990B
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Read IAUC 4985
Circular No. 4984
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
COMET SKORICHENKO-GEORGE (1989e1)
Improved parabolic orbital elements from MPC 16205:
T = 1990 Apr. 11.9389 ET Peri. = 137.8482
Node = 279.3118 1950.0
q = 1.569001 AU Incl. = 59.3652
1990 ET R.A. (1950) Decl. Delta r m1
Mar. 30 1 43.24 +42 13.5 2.172 1.579 8.7
Apr. 4 2 07.03 +41 54.8
9 2 30.25 +41 23.6 2.219 1.570 8.7
14 2 52.72 +40 40.7
19 3 14.30 +39 47.4 2.283 1.572 8.8
24 3 34.91 +38 45.1
29 3 54.49 +37 35.4 2.360 1.586 8.9
May 4 4 13.03 +36 19.5
9 4 30.56 +34 58.6 2.446 1.612 9.0
14 4 47.12 +33 33.9
19 5 02.77 +32 06.2 2.538 1.649 9.2
24 5 17.57 +30 36.3
29 5 31.58 +29 04.9 2.631 1.695 9.4
Total visual magnitude estimates (cf. IAUC 4972): Mar. 2.82 UT,
8.5 (O. Midtskogen, Tranby, Norway, 0.32-m reflector); 13.15, 9.3 (C.
Spratt, Victoria, BC, 0.20-m reflector); 18.84, 9.2 (H. Mikuz,
Ljubljana, Yugoslavia, 15x80 binoculars); 22.02, 9.2 (J. E. Bortle,
Stormville, NY, 0.32-m reflector); 24.15, 9.0 (C. S. Morris, Pine
Mountain Club, CA, 20x80 binoculars); 26.81, 9.0 (J.-C. Merlin, Le
Creusot, France, 0.15-m reflector).
SUPERNOVAE 1990G AND 1990B
A. V. Filippenko and J. C. Shields, University of California
at Berkeley, report that spectra (range 390-980 nm, resolution 1-2
nm), obtained on Mar. 25 UT with a CCD spectrograph on the 3-m Shane
telescope at Lick Observatory, confirm that SN 1990G (IAUC 4982) is
of type Ia, roughly 1-2 weeks past maximum. Also, spectra of the
type-Ib SN 1990B (IAUC 4949, 4953) show that it is beginning to enter
the supernebular phase dominated by strong [Ca II], [O I], and near-
infrared Ca II emission lines.
1990 March 27 (4984) Daniel W. E. Green
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