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IAUC 5383: 1991c1; 1991b1; 1991 VA

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IAUC number 

                                                  Circular No. 5383
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


PERIODIC COMET TSUCHINSHAN 1 (1991c1)
     S. Nakano, Sumoto, Japan, reports the recovery of this comet by
T. Seki with the 0.60-m reflector at Geisei.  The comet has a tail
30" long in p.a. 300 deg and is diffuse with central condensation.
Seki's observations yield a correction to the prediction on MPC
13057 of Delta(T) about +0.02 day:

     1991 UT             R.A. (1950) Decl.       m1
     Nov.  8.84306   12 30 53.70   + 4 17 18.5   17
          11.83056   12 38 14.92   + 3 39 39.0   18
          11.84340   12 38 16.77   + 3 39 30.1
          11.85208   12 38 18.09   + 3 39 19.9


COMET 1991b1
     E. Helin, Jet Propulsion Laboratory, reports the following
measurements (beginning and end points of the trailed images) by P.
Rose of pre-discovery images of this comet, from films taken by
herself, K. Lawrence, and Rose with the 0.46-m Schmidt telescope at
Palomar:

     1991 UT             R.A. (1950) Decl.       m1
     Nov.  3.21111   23 56 46.59   - 9 19 38.1   13
           3.21528   23 56 47.49   - 9 19 16.1
           3.23490   23 56 50.21   - 9 16 48.6
           3.23906   23 56 50.57   - 9 16 29.4
           6.16597    0 04 23.57   - 3 35 49.3
           6.17014    0 04 24.08   - 3 35 30.2
           6.18993    0 04 27.07   - 3 33 04.8
           6.19410    0 04 27.42   - 3 32 44.9

     Total visual magnitude estimate by C. S. Morris, Pine Mountain
Club, CA (0.26-m reflector):  Nov. 12.21 UT, 10.7 (coma diameter 6').


1991 VA
     D. Rabinowitz, Lunar and Planetary Laboratory, reports his
discovery, using the 0.91-m Spacewatch telescope at Kitt Peak, of a
faint Apollo object.  From observations by Rabinowitz and J. V.
Scotti during Nov. 1-6 B. G. Marsden, Harvard-Smithsonian Center for
Astrophysics, has determined T = 1991 Sept. 23.37 ET, Peri. = 313.50,
Node = 37.00, i = 6.50 (equinox 1950.0), q = 0.9259 AU, e = 0.3507,
H = 27.0.


1991 November 12               (5383)             Daniel W. E. Green

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