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IAUC 3911: 1984b; 1983n; IRAS 0453+444P03

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IAUC number 

                                                  Circular No. 3911
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


COMET CLARK (1984b)
     Michael Clark, Mount John University Observatory, reports his
discovery of a comet on Harvard Patrol plates, as follows:

          1984 UT           R.A. (1950.0) Decl.      m2

          Jan.  8.486       3 53        -34 35       12
               24.494       3 52        -34 45       12

The object is diffuse without condensation and has a tail < 1 deg
long (in p.a. 45 on the Jan. 8 prediscovery exposure).


PERIODIC COMET CROMMELIN (1983n)
     The following precise positions have been reported:

    1984 UT           R.A.  (1950.0)  Decl.     m1   Observer

    Jan. 20.74063   22 38 41.6    + 5 22 59          Hoffmann
         22.76882   22 46 30.53   + 5 15 18.4   13   Manning
         22.78757   22 46 34.95   + 5 15 14.3          "

M. Hoffmann (Hoher List Observatory).  Measurer: M. Geffert.
B. Manning (Stakenbridge).  Coma diameter 0'5.

     Total visual magnitude estimates: 1983 Dec. 29.76 UT, 12.3
(J.-C. Merlin, Le Creusot, France, 0.26-m reflector); 29.8, 12.8
(M. Verdenet, Bourbon-Lancy, France, very diffuse); 1984 Jan. 8.8,
12.0 (Verdenet, entirely diffuse); 21.16, 11.4 (C. S. Morris, San
Gabriel Mountains, CA, 0.20-m reflector, coma 3'1, very diffuse).


IRAS 0453+444P03
     A. J. Longmore, R. B. Isaacman and P. M. Williams, U.K. Infrared
Telescope Unit, telex: "A 20-micron source at R.A. = 4h53m06s8,
Decl. = +44deg27'59" (equinox 1950.0) was found using a 16-channel (SIAS
detector) mapping photometer to search a 1' square centered on the
error box for IRAS 0453+444P03 (Neugebauer and Habing 1983, Nature
305, 578).  Additional photometry with the UKIRT common-user
instruments gave magnitudes H = 12.7, K = 8.8, L' = 3.7, [11.6] =
0.9, Q = -1.7.  Filter-wheel spectra revealed strong ice absorption
at 3.05 microns.  The position and Q flux positively identify this
as the IRAS source.  It is distinct from the near-infrared source
discovered by Ashok et al. (IAUC 3906), and its K magnitude is
significantly fainter than their search limit."


1984 January 25                (3911)              Brian G. Marsden

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