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IAUC 2294: 1970p

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                                                  Circular No. 2294
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


COMET GUNN (1970p)
     Dr. M. Schmidt, California Institute of Technology, reports
that a comet was discovered by James E. Gunn on a plate exposed
with the 122-cm Schmidt telescope at Palomar on October 27.  From
the trailed image the daily motion was determined as dR.A. = -0m71,
dDecl. = -2'.  Further images of the comet were located on plates
exposed with the same telescope on November 22 and 23 by J. N.
Bahcall.  The comet was diffuse, with central condensation and a
small tail.  Dr. Gunn measured accurate positions from the three
plates, as shown below.  The comet was also recorded on November 6
by J. W. Young on three plates exposed with the 61-cm reflector at
Table Mountain Observatory, Wrightwood, California.

     1970 UT             R.A. (1950) Decl.        m1   Observer
     Oct. 27.22500    1 23 41.6    - 2 01 45     16    Gunn
     Nov.  6.31250    1 17 11.7    - 2 14 03     15    Young
           6.34722    1 17 09.9    - 2 13 56             "
          22.27014    1 09 29.5    - 2 10 00     16    Bahcall
          23.30486    1 09 08.3    - 2 08 48     16      "

     The elliptical elements below, by the undersigned, are very
uncertain, but the ephemeris should help observers to locate the
comet.  Differential residuals of 8" and 11" remain between the
second and third, and the fourth and fifth positions, respectively.

     T = 1969 Mar. 14.47 ET
 Peri. = 195.70                           e =   0.2931
 Node  =  66.91       1950.0              a =   3.5599 AU
 Incl. =  10.62                           n =   0.14674
     q =   2.5164 AU                      P =   6.72 years

1970/71     R. A. (1950) Decl.     Delta      r       m1
Dec. 10     1 05.75    - 1 32.4
     20     1 05.97    - 0 57.7    3.518    3.925    16.7
     30     1 07.78    - 0 15.0
Jan.  9     1 11.05    + 0 34.5    3.866    3.969    16.9
     19     1 15.61    + 1 29.4
     29     1 21.30    + 2 28.4    4.212    4.013    17.2

              m1 = 8.0 + 5 log Delta + 10 log r


1970 December 11               (2294)              Brian G. Marsden

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