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IAUC 3600: 1981c; STANDARD FILTERS FOR COMETARY PHOTOMETRY; Notice

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                                                  Circular No. 3600
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 ELIAS (1981c)
     R. J. Smyth, U.K. Schmidt Telescope Unit, provides the following
preliminary position, measured by him from an exposure by D. H.
Morgan with the 1.2-m Schmidt telescope at Siding Spring:

     1981 UT             R. A. (1950) Decl.
     Apr. 29.38079    10 31 52.68   -69 24 24.6

     The following orbital elements, by the undersigned, are very
uncertain, but the ephemeris should serve to locate the comet.

       T = 1981 June 6.19 ET     Peri. = 299.71
                                 Node  = 174.71    1950.0
       q = 4.8682 AU             Incl. = 115.76

     1981 ET     R. A. (1950) Decl.     Delta     r      m1
     Apr. 26    10 34.7    -70 32.3     4.383   4.879   15.1
     May   6    10 28.17   -67 07.8
          16    10 26.22   -63 37.0     4.383   4.871   15.1
          26    10 27.44   -60 07.2
     June  5    10 30.88   -56 44.5     4.488   4.868   15.1
          15    10 35.88   -53 34.0
          25    10 41.97   -50 38.8     4.680   4.870   15.2


STANDARD FILTERS FOR COMETARY PHOTOMETRY
     M. F. A'Hearn writes: "The Working Group on Standard Filters
for Cometary Photometry established by IAU Commission 15 announces
the availability of sets of standardized filters for photoelectric
photometry (non-imaging) of comets.  Observers wishing to obtain a
set of filters should contact me at the address: Astronomy Program,
University of Maryland, College Park, MD 20742, U.S.A."


NOTICE TO CONTRIBUTORS
     Several recent contributions with complex astrophysical data
telexed or telegraphed to the Central Bureau have been received in
rather pitiful form.  Contributors should ensure that there are sufficient
checks on numerical data and should refrain from using obscure
or ambiguous abbreviations.  It is recommended that a copy of
the material also be sent by mail.


1981 May 1                     (3600)              Brian G. Marsden

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