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IAUC 5159: 1991a; (2060); KR Aur

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                                                  Circular No. 5159
Central Bureau for Astronomical Telegrams
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

     The following observations have been reported:

     1991 UT           R.A. (1950) Decl.        m1       Observer
     Jan.  7.476       0 07.0      - 6 15       9        Kiuchi
           7.48        0 07.3      - 6 10       9.5      Camilleri
           7.531       0 07.4      - 6 10       9        Bradfield

T. Kiuchi (Usuda, Nagano, Japan).  25x150 binoculars.  Independent
  discovery.  Communicated by H. Kosai.
P. Camilleri (Cobram, Victoria).  20x80 binoculars.  Communicated by
  R. H. McNaught.
W. A. Bradfield (near Adelaide, S. Australia).  Independent
  discovery. Communicated by A. C. Beresford.

     Total visual magnitude estimate by D. H. Levy, Tucson, AZ
(0.41-m reflector):  Jan. 8.12 UT, 8.7.

(2060) CHIRON
     K. J. Meech, University of Hawaii, writes:  "CCD observations
made on 1990 Dec. 16 and 17 with the University of Hawaii 2.2-m
telescope on Mauna Kea indicate that the coma of Chiron is more
extensive than has been seen before.  A composite 540-s exposure through
the R filter shows an extended coma/tail at p.a. about 293 deg.
This closely agrees with the anti-solar direction, 292.3 deg, at the
time of the observation.  The coma extends out to at least 2 x 10E5
km and is visible in exposures as short as 90 s.  The absolute
magnitude, H = 6.2, is significantly brighter than observations obtained
during 1990 September with the same system.  April and September
observations showed that Chiron was continuing the trend of decreasing
brightness seen since 1989 January.  The December observations (r =
10.65 AU) suggest another possible outburst."

     Visual magnitude estimates (cf. IAUC 4682) by A. Boattini,
Florence, Italy:  1989 Mar. 4.93 UT, 13.3; Sept. 30.99, 14.0; Oct.
23.90, 13.3; 1990 Feb. 23.79, 13.0; Apr. 16.81, 13.4; Nov. 17.05,

1991 January 8                 (5159)             Daniel W. E. Green

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