Central Bureau for Astronomical Telegrams
IAUC 2743: SN IN NGC 2207; GK Per; SATURN; VENUS; 1974f; Obs OF COMETS
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Circular No. 2743
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
SUPERNOVA IN NGC 2207
Dr. M. Schmidt, Hale Observatories, communicates the following
photoelectric observations of supernova 1975A in the system NGC
2207, obtained by R. Green with the 152-cm telescope at Palomar.
The observations show the supernova increasing in brightness and
getting redder.
1975 UT V B - V U - B
Jan. 17.260 14.90 -0.05 -0.36
18.281 14.72 -0.03 -0.29
20.278 14.66 +0.08 -0.14
GK PERSEI
Mrs. Janet Mattei, Director of the American Association of
Variable Star Observers, communicates the following visual magnitude
estimates: Jan. 29.01 UT, 11.5 (P. 0. and M. J. Taylor); Feb.
1.02, 11.3 (C. Scovil); 2.0, 10.8 (J. E. Bortle); 3.0, 10.8
(Bortle); 3.10, 10.8 (E. Mayer).
SATURN
T. Encrenaz, M. Combes, L. Vapillon, J. Berezne and Y. Zeau,
Planetary Group, Meudon Observatory, report: "We obtained spectra
of Saturn between 700 and 1300 cm**-1 (with 2.5 cm**-1 resolution) with
the 152-cm telescope at the European Southern Observatory in Nov.
1974. C2H6 and C2H4 are visible in emission, and there may be a
weak emission due to C2H2. At 1100 to 1150 cm**-1 there is an
absorption identified as CH3D."
VENUS
Dr. J. E. Hansen writes: "Several observers are planning to
coordinate measurements of Venus during the interval May 1 to 15.
Included are ultraviolet photographs and polarization maps,
near-infrared radiance and polarization, CO2 and H2O absorption lines
and thermal infrared maps. Additional measurements and observers
are encouraged. Some measurements will be extended to June 15, and
measurements as a function of phase angle over the full range are
desirable. The main objective is to study physical differences
between ultraviolet light and dark areas. Further information can be
obtained from me at the address Goddard Institute for Space Studies,
2880 Broadway, New York, NY 10025, or from F. W. Taylor, Jet
Propulsion Laboratory, Pasadena, CA 91103, U.S.A.
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1974f)
The following precise positions have been reported:
1974/75 UT R. A. (1950) Decl. m1 Observer
Nov. 10.95497 18 35 16.07 -12 48 00.0 McCrosky
Dec. 11.95374 20 00 18.83 -14 30 06.8 "
14.70494 20 09 06.00 -14 50 59.4 9.0 Mrkos
14.70963 20 09 07.34 -14 51 00.5 "
21.70486 20 31 12.16 -16 16 49.2 8.2 Petrovicova
21.71597 20 31 13.99 -16 16 56.7 "
Jan. 2.38889 21 02 54.81 -21 53 58.1 6 Seki
2.40139 21 02 56.37 -21 54 28.7 "
7.44601 21 13 00.14 -26 21 24.2 8.1 Herald
11.44178 21 19 11.26 -31 03 36.1 8.3 "
11.44497 21 19 11.60 -31 03 52.6 "
12.39778 21 20 26.90 -32 21 22.3 9.6 Gilmore
R. E. McCrosky (Harvard College Observatory, Agassiz Station).
155-cm reflector. Measurers: C. Y. Shao and J. H. Bulger.
A. Mrkos and Ruzena Petrovicova (Klet Observatory).
T. Seki (Kochi Observatory, Geisei Station).
D. Herald (Woden, near Canberra). 31-cm reflector.
A. C. Gilmore (Carter Observatory). 10-cm f/10 astrograph.
Measurer: Pamela M. Kilmartin.
OBSERVATIONS OF COMETS
Mr. T. Seki (Geisei), provides the following precise positions
of comets P/Gunn (1969 II), P/Borrelly (1973m) and van den Bergh
(1974g), obtained by N. Kojima (Ishiki) and himself:
Comet 1974/75 UT R. A. (1950) Decl. m1 Observer
1969 II Dec. 12.80764 12 30 09.09 + 7 36 41.2 17 Seki
12.83264 12 30 10.65 + 7 36 34.5 17 "
16.82361 12 33 39.42 + 7 23 37.0 "
Jan. 17.72569 12 54 56.26 + 6 37 07.0 "
17.84201 12 54 59.69 + 6 37 13.0 Kojima
1973m Jan. 23.79653 14 25 28.21 +19 48 36.1 18 Seki
23.81528 14 25 28.86 +19 48 41.1 "
1974g Dec. 16.50347 1 26 30.64 +25 47 56.4 18 "
Jan. 14.40486 1 31 17.39 +22 26 11.7 18 "
1975 February 10 (2743) Brian G. Marsden
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