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IAUC 4831: 1989 PB; GK Per

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                                                  Circular No. 4831
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


1989 PB
     E. Helin reports her discovery of a fast-moving asteroidal object
on exposures by B. Roman, C. Mikolajczak, A. Mejia and herself with the
0.46-m Schmidt.  The following positions were measured by B. Roman:

     1989 UT             R.A. (1950) Decl.       Mag.
     Aug.  9.41771   23 34 35.06   - 9 01 32.5   15.0
          10.38316   23 35 39.94   - 8 20 52.1
          11.36528   23 36 49.88   - 7 34 12.2   15.0
          11.47396   23 36 55.39   - 7 28 39.7

     The following orbital elements seem moderately determinate and
indicate a close approach to the earth later this month.  Further
observations are urgently desired.

     T = 1989 Oct. 27.132 ET          Peri. = 120.070
     e = 0.48693                      Node  = 325.296   1950.0
     q = 0.55452 AU                   Incl. =   9.181
       a =  1.08080 AU     n = 0.877179     P =   1.12 years

     1989 ET      R.A. (1950) Decl.     Delta      r       V
     Aug. 10    23 35.22    - 8 36.9    0.147    1.138    14.3
          12    23 37.60    - 7 00.0
          14    23 40.43    - 4 52.2    0.111    1.107    13.6
          16    23 44.01    - 1 56.1
          18    23 48.91    + 2 20.5    0.075    1.075    12.7
          20    23 56.37    + 9 03.4
          22     0 09.71    +20 36.3    0.044    1.043    11.8
          24     0 41.35    +41 39.4
          26     3 04.6     +70 50.6    0.029    1.009    12.4
          28     9 12.19    +67 09.0
          30    10 26.20    +52 38.1    0.050    0.974    16.6


GK PERSEI
     Visual magnitude estimates: Aug. 6.42 UT, 10.7 (P. Sventek,
Houston, TX); 7.46, 10.8 (C. Spratt, Victoria, BC); 8.04, 11.1 (P.
Schmeer, Bischmisheim, West Germany); 9.36, 11.6 (J. E. Bortle,
Stormville, NY); 10.03, 10.9 (Schmeer); 11.00, 10.8 (Schmeer).


1989 August 11                 (4831)              Brian G. Marsden

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