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IAUC 4891: 1989 UR; GK Per

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IAUC number 

                                                Circular No. 4891
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 UR
     J. Mueller and D. Mendenhall report their discovery of a
fast-moving asteroidal object, found in the course of the second
Palomar Sky Survey with the 1.2-m Oschin Schmidt telescope.
C. Brewer was an observer.  The following positions are available:

     1989 UT             R.A. (1950) Decl.         R
     Oct. 28.20278    1 13 59.97   +28 23 16.3    18
          28.25139    1 13 49.15   +28 21 25.1
          29.23264    1 10 16.91   +27 41 12.9
          29.24653    1 10 13.94   +27 40 40.5
     Nov.  1.16667    0 59 31.93   +25 28 11.5
           1.21875    0 59 20.2    +25 25 45.1

     Preliminary orbital elements by B. G. Marsden, Center for
Astrophysics, from the above observations:

     T = 1990 Feb. 11.702 ET          Peri. = 289.905
     e = 0.36509                      Node  = 233.769   1950.0
     q = 0.68748 AU                   Incl. =  10.652
       a =  1.08281 AU     n = 0.874734     P =   1.13 years

     1989 ET      R.A. (1950) Decl.     Delta      r       V
     Nov.  2     0 56.43    +24 47.2    0.234    1.210    18.1
           4     0 49.01    +23 02.2
           6     0 41.64    +21 09.1    0.221    1.189    18.1
           8     0 34.36    +19 08.7
          10     0 27.24    +17 01.7    0.211    1.168    18.1
          12     0 20.31    +14 49.2
          14     0 13.63    +12 32.3    0.204    1.145    18.2
          16     0 07.21    +10 12.1
          18     0 01.08    + 7 49.8    0.200    1.123    18.3


GK PERSEI
     Further visual magnitude estimates (cf. IAUC 4855) by P. Schmeer,
Bischmisheim, West Germany:  Sept. 12.06 UT, 12.2; 16.96, 12.4;
20.86, 12.5; 29.93, 12.6; Oct. 4.05, 13.0; 21.91, 13.0; 26.04, 13.1.


1989 November 2                (4891)             Daniel W. E. Green

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