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IAUC 2280: 1970l; 1969l; STANDARD DATES FOR EPHEMS AND OSC ELS

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IAUC number 

                                                  Circular No. 2280
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


PERIODIC COMET ENCKE (1970l)
     Dr. Elizabeth Roemer, Lunar and Planetary Laboratory, telegraphs
that she has recovered this comet with the 229-cm Steward
Observatory reflector on Kitt Peak.  The comet is of stellar
appearance.  For the ephemeris, see IAUC 2244 and 2276.

     1970 UT             R. A. (1950) Decl.        mpg
     Sept.26.42054     1 44.6       +28 26         18


COMET BENNETT (1969l)
       The following observations have been obtained at the Klet
Observatory by R. Petrovicova and A. Mrkos:

     1970 UT             R. A. (1950) Decl.        Observer
     Aug.  2.01625     4 44 57.25   +76 04 00.1    Petrovicova
           4.99854     4 46 42.50   +76 32 44.1      "
           5.99227     4 47 10.91   +76 42 35.2      "
           6.97867     4 47 33.31   +76 52 23.8      "
     Sept. 2.87854     4 11 06.32   +81 32 35.7    Mrkos
           7.85963     3 47 06.45   +82 16 51.6      "
           8.09192     3 45 41.70   +82 18 43.6      "


STANDARD DATES FOR EPHEMERIDES AND OSCULATING ELEMENTS
     At about this time of the year it is customary for us to print
on a Circular the list of standard 10-day dates for the following
calendar year.  These dates, corresponding to 0h UT (or ET) when
the Julian date, on division by 10, leaves the remainder 0.5, are
readily determined, and it seems unnecessary for us to continue to
print them here.  We merely remind orbit computers that ephemeris
positions should always be given for these dates and, if appropriate,
for regularly spaced intervening dates also.  The following is
a somewhat related resolution adopted at the meetings of IAU Commission
20 last month: "It is recommended that, whenever perturbations
are taken into account, the published osculating elements of a comet
should be referred, in general, to the 40-day standard Julian date
nearest the time of perihelion passage."


1970 September 29              (2280)              Brian G. Marsden

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