Central Bureau for Astronomical Telegrams
IAUC 3890: 1983 VB; Occns BY (4); SN IN NGC 1448; 1983l
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Read IAUC 3891
Circular No. 3890
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
1983 VB
C. Kowal provides the following precise positions for the
Palomar observations reported on IAUC 3885:
1983 UT R.A. (1950.0) Decl.
Nov. 6.49792 7 11 23.74 +59 55 41.0
6.51181 7 11 15.03 +59 54 02.4
8.35625 6 54 31.60 +56 03 25.7
OCCULTATIONS BY (4) VESTA
R. L. Millis writes that (4) Vesta has been predicted to
occult AGK3 +19 418 on 1983 Dec. 30 (Wasserman, Bowell and Millis
1981, A.J. 86, 1974) and AGK3 +19 410 on 1984 Jan. 7 (Taylor 1981,
A.J. 86, 903). His photometry gives, for AGK3 +19 418, V = 10.23
+/- 0.1, B-V = +1.03 +/- 0.01, U-B = +0.67 +/- 0.01; and for AGK3
+19 410, V = 9.54 +/- 0.01, B-V = +1.25 +/- 0.01, U-B = +0.94 +/- 0.01.
In the V passband the changes in the combined signal from the star
and minor planet at disappearance are expected to be 0.04 and 0.09
mag, respectively. However, since both stars are significantly
redder than Vesta, observations further in the red would be more
favorable, particularly between 0.9 and 1.0 microns, where the
reflectivity of Vesta is substantially depressed. The references cited
above give the nominal locations of the ground tracks for the
occultations. Individuals interested in attempting observations are
invited to contact Millis (address: Lowell Observatory, P.O. Box
1269, Flagstaff, AZ 86001, U.S.A.: telephone 602-774-3358) so that
prediction updates can be forwarded to them.
SUPERNOVA IN NGC 1448
O.-G. Richter reports that spectrograms obtained with the
1.5-m telescope at the European Southern Observatory confirm this
supernova to be of type II (cf. IAUC 3877, 3878). Crude estimates
yield expansion velocities larger than 3000 km/s.
COMET CERNIS (1983l)
Total visual magnitude estimates: Oct. 15.26 UT, 9.4 (C. S.
Morris, Harvard, MA, 0.25-m reflector); 31.13, 10.7 (Morris); Nov.
5.07, 10.9 (J. Bortle, Stormville, NY, 0.32-m reflector).
1983 November 15 (3890) Brian G. Marsden
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