Central Bureau for Astronomical Telegrams
IAUC 3564: 1980t; 1976 UA; NOTICE RE Tlgms
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Circular No. 3564
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
COMET BRADFIELD (1980t)
Several observers have reported that this comet underwent an
outburst yesterday. Visual estimates: Jan. 11.95 UT, m1 = 5.5,
tail 4o in p.a. 33o (C. S. Morris, Harvard, MA, 20 x 80 bin.);
12.01, 5.6, 3o.2 in 48o (C. Sherrod, North Little Rock, AR, 10 x 50);
12.96, 5.6, 3o.5 in 33o (D. W. E. Green, Harvard, MA, 20 x 80);
13.01, 5.3, 3o.5 in 45o (Sherrod); 13.74, 4.8, - (P. Burst? Utrecht?
12 x 40 bin.); 13.95, 4.6, 30 in 380 (Green, Cambridge, MA); 13.96,
4.4, 3o in 35o (Morris).
D. A. Pickup, Royal Observatory, Edinburgh, communicates the
following prediscovery position, identified and measured by K. S.
Russell at his suggestion on an exposure by J. Barrow and R. J.
Smyth with the l.2-m U.K. Schmidt telescope at Coonabarabran:
1980 UT R. A. (1950) Decl. m1
July 18.42207 16 43 59.40 -50 50 42.9 16
1976 UA
This Aten-type object has been recovered as follows:
1980/81 UT R. A. (1950) Decl. Mag. Observer
Dec. 7.36708 7 26 04.56 + 1 17 26.4 20 Shao
Jan. 3.20828 5 03 35.25 -13 22 12.2 "
5.31597 4 47 47.52 -14 10 16.2 Bus
6.13773 4 41 39.37 -14 26 52.9 19.5 Shao
7.27569 4 33 10.88 -14 47 52.1 Helin
C.-Y. Shao (Harvard College Observatory, Agassiz Station).
S. J. Bus, E. Helm and H. C. Arp (Palomar Mountain Observatory).
The indicated correction to the ephemeris on MPC 5526 (elements
on MPC 4659) is Delta-T ~ +0.02 to +0.03 day. Further details and
an improved orbit will be published on the Feb. 1 MPCs.
NOTICE CONCERNING TELEGRAMS
It is once again an 'open season' for making changes in the
list of subscribers to the Central Bureau's telegram service.
Subscribers who wish to make address changes, category changes, etc.,
are requested to inform us of said changes by Feb. 28.
1981 January 14 (3564) Brian G. Marsden
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