IAUC 2844: JUPITER; 1975h (original) (raw)

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Circular No. 2844 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

JUPITER 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."

COMET KOBAYASHI-BERGER-MILON (1975h) 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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