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IAUC 2844: JUPITER; 1975h

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                                                  Circular No. 2844
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

     R. F. Beebe, New Mexico State University Observatory, communicates
the following: "E. J. Reese reports that two very bright
spots are being observed on Jupiter at zenographic latitude +23o.4
in the infrequently-active jet stream along the south edge of the
North Temperate Belt.  Measurement of photographs indicates that
one of these bright clouds moved from longitude 354o (System I) on
Sept. 15 to longitude 306o on Sept. 24; this represents a velocity
of 170 m/s relative to System III (1965) or a rotation period of
9h46m57s.  The other cloud drifted from longitude 108o (System I)
on Sept. 15 to longitude 50o on Sept. 27, corresponding to a velocity
of 163 m/s relative to System III (1965) or a rotation period of
9h47m15s.  The bright clouds, which are visible at all wavelengths
from ultraviolet to infrared, are very well defined and
comparable in size, with lengths of 7000 km in longitude and widths
of 4400 km in latitude."

     H. L. Giclas, Lowell Observatory, provides the following
precise positions, the last of which may be uncertain by something
like +/- 3".  Measurer: M. L. Kantz.

     1975 UT             R. A. (1950) Decl.
     Aug. 16.14531    11 51 04.80   +43 25 38.0
          16.15156    11 51 03.28   +43 25 22.7
          26.13142    11 15 57.13   +36 48 32.8
          26.13490    11 15 56.62   +36 48 23.5
     Sept.19.50642    10 29 02.14   +11 25 15.0

     D. Green, Boone, North Carolina, reports the following visual
observation, made using 12 x 50 binoculars: Sept. 14.42 UT, m1 ~
5.6, coma diameter 5' to 8', tail ~ 20' long in p.a. 325o-330o.

     P. Maley, Houston, Texas, provides the following total visual
magnitude estimates (13-cm f/5 refractor): Sept. 19.46 UT, 5.7;
20.46, 5.7; 23.46, 6.3; 24.46, 6.3; 25.47, 6.4; 28.46, 6.9; 29.46,
7.0.  On each occasion there was a tail roughly 30' long.

     D. Fellers, Topeka, Kansas, reports that a photograph taken on
Sept. 26.46 with a 20-cm Schmidt telescope shows a fanshaped tail
about 30' long in p.a. 300o; the comet's total magnitude was 6.5.

1975 October 1                 (2844)              Brian G. Marsden

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