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IAUC 2702: Prob. NEW Sat OF JUPITER; 1974b

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                                                  Circular No. 2702
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


PROBABLE NEW SATELLITE OF JUPITER
     Dr. M. Schmidt, Hale Observatories, communicates the following
precise positions of an object discovered near Jupiter by Charles
T. Kowal on plates taken with the 122-cm Schmidt telescope at
Palomar:

     1974 UT             R. A. (1950) Decl.        mpv
     Sept.11.28194    22 50 57.28   - 8 59 27.2    20
          12.26042    22 50 26.09   - 9 01 52.9
          13.37083    22 49 50.68   - 9 04 37.3

     The slow motion suggests that the object is a new satellite of
Jupiter, although the observations can also be satisfied by
heliocentric orbits, notably by an eccentric orbit near the 2:1
mean-motion resonance with Jupiter (e.g., like that of the minor planet
1973 SE: cf. IAUC 2608); the departure from great-circle motion is
only 0".4.  The following very tentative ephemeris has been derived
by K. Aksnes and B. G. Marsden, Center for Astrophysics, Harvard
and Smithsonian Observatories, on the assumption that the object is
a member of the group of distant, retrograde satellites of Jupiter.
dR.A. and dDecl. are the offsets from Jupiter.  Further observations are
urgently desired.

     1974 ET     R. A. (1950) Decl.     dR.A.   dDecl.
     Sept.15    22 48.99    - 9 08.5    -4m35   -28'4
          20    22 46.43    - 9 20.1    -4.55   -25.7
          25    22 44.01    - 9 30.6    -4.75   -23.0
          30    22 41.76    - 9 39.9    -4.93   -20.2
     Oct.  5    22 39.73    - 9 47.8    -5.10   -17.4
          10    22 37.95    - 9 54.2    -5.24   -14.7


COMET BRADFIELD (1974b)
     Dr. R. L. Waterfield, Woolston Observatory, provides the
following precise position, measured by him from a plate taken by
G. H. Rutter.  The image was very faint and only moderately
condensed and therefore difficult to measure.

     1974 UT             R. A. (1950) Decl.         m1
     Aug. 16.91693    15 41 01.29   +42 56 58.4    15.0


1974 September 20              (2702)              Brian G. Marsden

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