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IAUC 3453: 1980 AA; 1979l

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IAUC number


                                                  Circular No. 3453
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 617-864-5758


1980 AA
     Extension of the ephemeris on IAUC 3447:

     1980 ET     R. A. (1950) Decl.     Delta     r      B
     Feb. 21     9 38.18    - 2 02.9
     Mar.  2     9 50.69    - 3 10.9    0.213   1.195   17.5
          12    10 01.26    - 3 23.2
          22    10 11.66    - 3 13.0    0.335   1.301   18.8
     Apr.  1    10 22.83    - 3 00.6
          11    10 34.91    - 2 56.0    0.499   1.419   20.0
          21    10 47.93    - 3 03.6
     May   1    11 01.81    - 3 24.8    0.706   1.540   21.0


COMET BRADFIELD (1979l)
     Ephemeris continuation from the elements on MPC 5176:

     1980 ET     R. A. (1950) Decl.     Delta     r      m1
     Feb. 26     3 41.16    +21 02.5
     Mar.  2     3 44.88    +22 29.7    1.382   1.522   10.0
           7     3 48.63    +23 39.5
          12     3 52.45    +24 37.5    1.730   1.677   10.9
          17     3 56.36    +25 27.1
          22     4 00.35    +26 10.6    2.063   1.827   11.7
          27     4 04.42    +26 49.5
     Apr.  1     4 08.56    +27 24.8    2.378   1.974   12.3
           6     4 12.75    +27 57.3
          11     4 16.99    +28 27.5    2.672   2.118   12.9
          16     4 21.27    +28 56.0
          21     4 25.58    +29 22.9    2.943   2.258   13.4
          26     4 29.90    +29 48.5
     May   1     4 34.23    +30 13.2    3.190   2.395   13.8

     A. C. Danks and W. Wamsteker, European Southern Observatory.
provide the following infrared magnitudes, obtained with the INSB
photometer on the 1-m telescope.  The measurements were centered on
the visible nucleus in a 12" diaphragm with a 13" chop.  An
integration time of 5 s was used, and the telescope tracking rate was
adjusted to maintain the comet in the diaphragm.  Jan. 27.131 UT,
H = 11.53 +/- 0.06; 27.135, K = 10.94 +/- 0.10; 27.154, L = 7.34 +/- 0.25.


1980 February 15               (3453)              Brian G. Marsden

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