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IAUC 4603: 1987g

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IAUC number 

                                                  Circular No. 4603
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET TEMPEL 2 (1987g)
     W. Wisniewski, University of Arizona, reports: "I monitored this
comet with a standard photoelectric photometer on the 1.5-m Catalina
reflector on the three nights May 20-22 UT.  The range of variability
was 0.5 mag.  Assuming two maxima per period the observations are best
represented by a rotation period of 8 hr 58 min, confirming the report
by Jewitt and Luu on IAUC 4582.  However, the amplitude is now smaller
by 0.2 mag, indicating coma development.  Maxima are at V = 15.51 (17"
diaphragm) and 15.68 (12" diaphragm).  An aperture test shows that 94
percent of the light from the nuclear region is included in the
17" diaphragm."
     Ephemeris from the orbital elements on MPC 11522:

     1988/89 ET   R.A. (1950) Decl.     Delta      r       m1
     May  19    15 57.48    + 3 45.7    0.881    1.853    13.0
          29    15 47.77    + 3 57.9
     June  8    15 37.94    + 3 27.3    0.793    1.733    12.2
          18    15 29.68    + 2 09.7
          28    15 24.58    + 0 07.1    0.769    1.622    11.6
     July  8    15 23.63    - 2 33.4
          18    15 27.35    - 5 43.5    0.786    1.526    11.1
          28    15 35.93    - 9 13.9
     Aug.  7    15 49.27    -12 55.7    0.824    1.451    10.5
          17    16 07.29    -16 40.1
          27    16 29.83    -20 17.5    0.879    1.401     9.7
     Sept. 6    16 56.65    -23 37.7
          16    17 27.43    -26 30.2    0.952    1.383     8.9
          26    18 01.59    -28 44.9
     Oct.  6    18 38.24    -30 13.7    1.052    1.399     8.1
          16    19 16.28    -30 52.2
          26    19 54.49    -30 40.2    1.187    1.446     8.2
     Nov.  5    20 31.76    -29 42.1
          15    21 07.32    -28 04.8    1.361    1.520     9.1
          25    21 40.74    -25 57.3
     Dec.  5    22 11.89    -23 28.3    1.573    1.615    10.4
          15    22 40.87    -20 45.4
          25    23 07.90    -17 55.0    1.820    1.724    11.2
     Jan.  4    23 33.23    -15 02.1
          14    23 57.14    -12 10.3    2.093    1.843    12.4


1988 May 25                    (4603)              Brian G. Marsden

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