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IAUC 5103: 1990 SQ; P/SCHWASSMANN-WACHMANN 1

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                                                  Circular No. 5103
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


1990 SQ
     E. Helin reports the discovery by B. Roman of a fast-moving
asteroidal object, found on films exposed by Roman, K. Lawrence,
and P. Rose with the 0.46-m Schmidt telescope at Palomar.  The
following measurements are by Lawrence and Roman:

     1990 UT             R.A. (1950) Decl.       Mag.
     Sept.23.17135   22 00 13.72   -21 41 20.6   14.0
          23.19635   22 00 09.63   -21 40 22.1
          25.16215   21 55 31.42   -20 22 49.5   14.0
          25.33993   21 55 05.21   -20 15 33.5
          26.25573   21 53 00.98   -19 37 53.4   14.0
          26.31424   21 52 52.65   -19 35 26.9

     Preliminary orbital elements from the above observations:

     T = 1990 Nov. 28.466 ET          Peri. =  52.347
     e = 0.41754                      Node  = 358.628   1950.0
     q = 1.09795 AU                   Incl. =  16.630
       a =  1.88502 AU     n = 0.380829     P =   2.59 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Sept.16    22 18.45    -25 44.8    0.354    1.327    13.3
          21    22 05.56    -23 01.5
          26    21 53.60    -19 48.2    0.329    1.276    13.3
     Oct.  1    21 43.10    -16 09.8
           6    21 34.39    -12 12.8    0.319    1.229    13.3
          11    21 27.62    - 8 03.8
          16    21 22.86    - 3 48.9    0.320    1.188    13.5


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     Total visual magnitude estimates (cf. IAUC 5090):  Sept. 15.24
UT, 12.4 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector);
16.25, 12.0 (Morris, Lockwood Valley, CA, 0.51-m reflector); 25.25,
12.6 (A. Hale, Las Cruces, NM, 0.41-m reflector).


1990 September 26              (5103)             Daniel W. E. Green

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