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IAUC 5137: 1990 TR; 1990 SQ; MWC 560; 1989t

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IAUC number


                                                  Circular No. 5137
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 TR
     This object was independently discovered at the Crimean
Astrophysical Observatory by A. V. Tarasova and L. I. Chernykh on
Sept. 24.  The following ephemeris extends that on IAUC 5121:

     1990/91      R.A. (1950) Decl.     Delta      r       V
     Nov. 25     1 56.09    +27 17.3    0.522    1.467    14.3
     Dec.  5     2 00.39    +27 27.7
          15     2 08.32    +27 35.4    0.714    1.575    15.3
          25     2 19.23    +27 45.8
     Jan.  4     2 32.49    +28 00.8    0.953    1.688    16.2


1990 SQ
     Extension to the ephemeris on IAUC 5113:

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Nov. 25    21 44.70    +28 39.1    0.393    1.104    13.2
          30    21 54.33    +32 16.8
     Dec.  5    22 05.64    +35 48.2    0.412    1.106    13.3
          10    22 18.84    +39 12.3
          15    22 34.21    +42 28.2    0.432    1.119    13.4
          20    22 52.07    +45 34.3
          25    23 12.75    +48 28.1    0.454    1.142    13.5


MWC 560
     Further visual magnitude estimates (cf. IAUC 5009):  Oct. 5.18
UT, 9.7 (P. Schmeer, Bischmisheim, Germany); 9.17, 9.3 (A. Pereira,
Cabo da Roca, Portugal); 17.18, 9.2 (H. Dahle, Oslo, Norway); Nov.
7.18, 9.7 (Schmeer); 13.22, 9.4 (Pereira).


PERIODIC COMET WILD 2 (1989t)
     Total visual magnitude estimates (cf. IAUC 5123):  Oct. 30.51
UT, 12.6 (A. Hale, Las Cruces, NM, 0.41-m reflector); Nov. 10.54,
12.4 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector);
15.52, 12.3 (Hale).


1990 November 19               (5137)             Daniel W. E. Green

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