Central Bureau for Astronomical Telegrams
IAUC 4939: 1989f1; 1989V
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Read IAUC 4940
Circular No. 4939
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 McKENZIE-RUSSELL (1989f1)
Ephemeris from the orbital elements on IAUC 4938:
1990 ET R.A. (1950) Decl. Delta r m1
Jan. 9 3 27.73 - 0 47.4 1.451 2.116 13.6
14 3 12.06 - 1 13.7
19 2 59.57 - 1 30.6 1.713 2.162 14.0
24 2 49.70 - 1 40.1
29 2 41.97 - 1 44.2 1.994 2.213 14.4
Feb. 3 2 35.98 - 1 44.1
8 2 31.40 - 1 41.0 2.277 2.269 14.8
13 2 27.97 - 1 35.7
18 2 25.48 - 1 28.8 2.550 2.329 15.2
E. Bowell, Lowell Observatory, reports that exposures by P. Roques
(Williams, AZ; 0.10-m Schmidt telescope) show the comet's tail as
follows: 1989 Dec. 24.15 UT, 5' in p.a. 48 deg; 1990 Jan. 1.08, 10' in
p.a. 60 deg; 2.14, 12' in p.a. 64 deg.
Total visual magnitude estimates: 1989 Dec. 30.14 UT, 13.0 (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector); 31.22, 13.0 (Morris);
1990 Jan. 1.38, 12.3 (A. Hale, Las Cruces, NM, 0.41-m reflector); 1.57,
13.4 (A. Pearce, Scarborough, Western Australia, 0.41-m reflector).
SUPERNOVA 1989V IN ANONYMOUS GALAXY
M. Phillips and N. Suntzeff, Cerro Tololo Interamerican
Observatory, report that a spectrum obtained on Jan. 4 with the 4.0-m
telescope shows this object to be a type Ia supernova within
approximately one week of maximum. Strong Si II 635.5-nm absorption
is detected at an observed wavelength of 649.0 nm. A low signal-to-
noise spectrum obtained of the parent galaxy suggests a redshift of
approximately 0.061. CCD photometry carried out with the 0.91-m
telescope yields the following preliminary magnitudes: B = 18.8, V =
18.35, I = 18.03.
A. V. Filippenko, University of California at Berkeley, reports
that spectra (range 350-990 nm, resolution 1-2 nm), obtained on Jan. 3
and 4 UT with a CCD spectrograph on the Shane 3-m reflector at the Lick
Observatory, show that SN 1989V is probably of type Ia within a few
weeks of maximum brightness. Its redshift is approximately 0.06, and
the spectrum is heavily contaminated by the parent galaxy, the center
of which is only 2" away.
1990 January 4 (4939) Brian G. Marsden
Read IAUC 4940
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