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IAUC 5371: 1991 TB2; EF Peg

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                                                  Circular No. 5371
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


1991 TB2
     A fast-moving asteroidal object has been independently
discovered at Palomar by J. Mueller (Oct. 3), on a plate taken by C.
Brewer and herself with the Oschin Schmidt telescope, and by C.
Shoemaker (Oct. 6), on films taken by herself, E. M. Shoemaker, and
D. H. Levy with the 0.46-m Schmidt:

     1991 UT             R.A. (1950) Decl.       Mag.   Observer
     Oct.  3.22778   23 06 28.16   +21 42 59.6   17.5   Mueller
           3.27292   23 06 15.25   +21 42 49.3            "
           4.25156   23 01 25.07   +21 37 53.4   18     Shoemaker
           4.28160   23 01 15.64   +21 37 44.1            "
           6.24010   22 51 04.90   +21 24 15.0            "
           6.28299   22 50 50.78   +21 23 53.0            "

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

     T = 1991 Dec. 15.146 ET          Peri. = 195.619
     e = 0.83579                      Node  = 296.452   1950.0
     q = 0.39357 AU                   Incl. =   8.648
       a =  2.39678 AU     n = 0.265620     P =   3.71 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 11    22 23.62    +20 29.0    0.403    1.331    16.9
          16    21 51.00    +18 50.7
          21    21 15.35    +16 27.1    0.341    1.185    16.9
          26    20 37.80    +13 19.9
          31    19 59.47    + 9 37.4    0.313    1.031    17.1
     Nov.  5    19 21.17    + 5 32.2
          10    18 43.24    + 1 17.9    0.317    0.870    18.0
          15    18 05.80    - 2 53.9
          20    17 29.21    - 6 53.3    0.357    0.702    20.3


EF PEGASI
     T. Kato and T. Takata, Department of Astronomy, Kyoto University,
report that CCD photometry with the Ouda 0.60-m reflector revealed
two superhumps at Oct. 18.445 and 18.536 UT (amplitude 0.14
mag in V), confirming the SU UMa nature of this object.


1991 October 19                (5371)             Daniel W. E. Green

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