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IAUC 2838: 1975h; 1975g

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IAUC number 

                                                  Circular No. 2838
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 KOBAYASHI-BERGER-MILON (1975h)
     L. W. Avery and B. H. Andrew, Herzberg Institute of Astrophysics,
report the detection of emission at 3335.48 MHz from the rotational
ground state of CH.  Using the 46-m Algonquin radio telescope
they measured an antenna temperature of 0.04 +/- 0.01 K for the
1 -> 1 line of the {2}pi_{1/2} J = 1/2 state on Sept. 7, 8 and 9.

     F. Borngen, Tautenburg Observatory, reports that he, assisted
by P. Lochno and K. Kirsch, took eight long exposures with the 134-cm
f/3 Schmidt telescope on five nights between July 31 and Aug. 6.
He writes: "The length of the main tail is more than 2o on all the
plates, which range in sensitivity from ultraviolet to red.  Numerous
details, such as faint cloud-like condensations, are apparent.
The main tail is generally flanked on both sides by several fainter
thread-like streamers, which are straight and of various lengths.
These streamers come directly from the head or branch off from the
main tail farther from the nucleus.  There is to some extent evidence
of screw-like and turbulent motions in the tail material."

     J. Bortle, Brooks Observatory, writes that he was able to detect
the comet in the morning sky on Sept. 4.39 UT and provides the
following total visual magnitude estimates, coma diameters and tail
information, obtained using 10 x 50 binoculars: Sept. 11.40, 4.9,
2', -; 13.40, 4.9, > 2', 10' in p.a. 340o; 14.40, 5.1, 1'.5, 1o in
320o; 15.39, 5.0, 1'.3, 1o in 320o.


COMET LONGMORE (1975g)
     No further observations have been reported.  The following
continuation to the ephemeris on IAUC 2812 is thus somewhat uncertain.

     1975 ET     R. A. (1950) Decl.     Delta     r      m1
     Sept.25    18 23.03    -49 26.2    2.887   3.104   18.7
     Oct.  5    18 35.31    -48 02.4
          15    18 48.80    -46 40.5    3.198   3.170   19.0
          25    19 03.19    -45 19.8
     Nov.  4    19 18.22    -43 59.7    3.505   3.237   19.3
          14    19 33.70    -42 39.6
          24    19 49.43    -41 19.2    3.794   3.304   19.6
     Dec.  4    20 05.28    -39 58.0
          14    20 21.12    -38 36.1    4.048   3.370   19.8


1975 September 18              (2838)              Brian G. Marsden

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