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IAUC 5423: 1991 YA; N Pup 1991

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                                                  Circular No. 5423
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 YA
     A fast-moving asteroidal object discovered by C. S. Shoemaker,
E. M. Shoemaker, and D. H. Levy with the 0.46-m Schmidt telescope at
Palomar on 1991 Dec. 31 has also been identified by them on a Dec. 2
exposure.  The following measurements are by Levy and T. King:

     1991 UT             R.A. (2000) Decl.       Mag.
     Dec.  2.35017    6 29 45.85   +59 31 35.7   16.0
           2.38438    6 29 38.51   +59 30 18.7
          31.26597    5 09 06.19   +29 49 34.4   16.0
          31.29861    5 09 02.73   +29 47 10.4
     Jan.  3.11163    5 04 52.63   +26 21 01.9
           3.13281    5 04 50.97   +26 19 32.0

     Orbital elements by G. V. Williams from the above observations:

     T = 1991 Dec. 27.774 TT          Peri. = 174.142
     e = 0.44717                      Node  = 274.375   2000.0
     q = 1.53410 AU                   Incl. =  44.463
       a =  2.77500 AU     n = 0.213211     P =   4.62 years

1991/92     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Dec. 30     5 11.22    +31 23.9    0.573    1.534  159.8   12.8     15.0
Jan.  4     5 03.69    +25 17.4    0.589    1.536  154.2   16.2     15.2
      9     4 58.32    +19 35.7    0.616    1.538  147.3   20.2     15.4
     14     4 54.88    +14 29.7    0.652    1.542  140.2   24.1     15.6
     19     4 53.14    +10 03.6    0.696    1.548  133.6   27.4     15.9
     24     4 52.85    + 6 17.0    0.746    1.555  127.4   30.2     16.1
     29     4 53.82    + 3 06.5    0.800    1.563  121.9   32.4     16.4
Feb.  3     4 55.87    + 0 27.6    0.858    1.572  116.9   34.0     16.6
      8     4 58.88    - 1 44.7    0.919    1.583  112.3   35.2     16.8
     13     5 02.70    - 3 34.8    0.981    1.595  108.2   36.0     16.9
     18     5 07.25    - 5 06.7    1.045    1.608  104.5   36.5     17.1


NOVA PUPPIS 1991
     Visual magnitude estimates by A. Pearce, Scarborough, W.
Australia:  Jan. 5.54 UT, 8.2; 6.55, 8.5; 7.54, 8.7; 8.62, 8.7.


1992 January 8                 (5423)             Daniel W. E. Green

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