Central Bureau for Astronomical Telegrams
IAUC 2753: SN IN NGC 2207; 1972 RA; 1973 X; 1973 XI; 1974e; Obs OF COMETS
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Circular No. 2753
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. N. V. Vidal, Mount Stromlo and Siding Spring Observatories,
writes: "Image-tube spectra (dispersion 200 A/rmn) of the supernova
in NGC 2207 were taken with the 190-cm telescope on Jan. 23.63 UT
in the blue-visual region. They show type I supernova characteristics:
broad emission bands at about 3650, 4115, 4570, 4980 and
5185 A; and broad absorption bands at about 3780, 4350, 4910 and
5065 A. The estimated visual magnitude is about 14.5. This value is
consistent with Green's magnitude estimates (IAUC 2743) and shows
that our spectra were taken probably on the rising branch of the
light curve or very close to maximum."
1972 RA
The orbital elements and ephemeris below, by B. G. Marsden,
are based on 39 observations 1972 Sept. 7 to 1973 Jan. 29. A very
similar prediction has been supplied by C. M. Bardwell, Cincinnati
Observatory.
T = 1976 Apr. 10.7967 ET Epoch = 1976 Apr. 12.0 ET
Peri. = 216.8849 e = 0.510644
Node = 169.8773 1950.0 a = 2.292285 AU
Incl. = 8.7943 n = 0.2839887
q = 1.12174 AU P = 3.471 years
For dT = +1d
1975 ET R. A. (1950) Decl. Delta r dR.A. dDecl. Mag.
Apr. 18 16 53.56 -11 20.6 2.202 2.975 -0m85 + 1'2 21.9
28 16 48.98 -10 31.7 -0.91 + 1.3
May 8 16 41.89 - 9 40.9 1.962 2.899 -0.95 + 1.3 21.5
18 16 32.63 - 8 51.3 -0.98 + 1.4
28 16 21.89 - 8 06.4 1.822 2.818 -0.98 + 1.4 21.2
June 7 16 10.59 - 7 30.3 -0.96 + 1.3
17 15 59.71 - 7 06.4 1.794 2.730 -0.92 + 1.2 21.2
27 15 50.45 - 6 56.8 -0.87 + 1.2
July 7 15 43.31 - 7 02.2 1.865 2.637 -0.81 + 1.1 21.4
17 15 38.84 - 7 22.0 -0.76 + 1.1
27 15 37.17 - 7 54.4 1.997 2.538 -0.71 + 1.1 21.5
Aug. 6 15 38.28 - 8 37.2 -0.67 + 1.1
16 15 42.04 - 9 28.1 2.155 2.432 -0.64 + 1.2 21.7
Mag. = 17.5 + 5 log Delta + 5 log r + 0.023 (phase angle)
COMET SANDAGE (1973 X)
Mr. T. Seki, Kochi Observatory, Geisei Station, provides the
following precise positions, obtained with a 40-cm f/5 reflector:
1975 UT R. A. (1950) Decl. m1
Jan. 17.68750 11 44 42.5 +45 53 10 18.5
Feb. 15.61944 11 03 42.19 +49 43 44.8 19
15.65069 11 03 39.37 +49 43 59.1
PERIODIC COMET GEHRELS 2 (1973 XI)
Dr. P. Wild, Astronomical Institute, Berne University, provides
the following precise positions, obtained at Zimmerwald:
1974 UT R. A. (1950) Decl.
Nov. 19.8028 1 16 20.34 + 8 10 21.5
23.9951 1 16 13.87 + 7 53 39.6
COMET CESCO (1974e)
Mr. C. Torres, Department of Astronomy, University of Chile,
provides the following precise position, obtained by S. Barros and
himself at Cerro El Roble. Measurer: M. Wischnjewsky.
1974 UT R. A. (1950) Decl.
Aug. 23.01423 16 30 31.78 -30 00 26.8
OBSERVATIONS OF COMETS
The following precise positions of comets Sandage (1972 IX),
P/Reinmuth 2 (1973g), P/Finlay (1974d) and van den Bergh (1974g)
have been obtained by R. E. McCrosky, J. H. Bulger, C. Y. Shao and
G. Schwartz with the 155-cm reflector at the Agassiz Station of the
Harvard College Observatory. Measurers: Shao and Bulger.
Comet 1974 UT R. A. (1950) Decl.
1972 IX Oct. 19.04078 0 12 13.74 +59 43 25.8
1973g Aug. 20.29139 3 14 30.43 +26 31 05.1
21.33613 3 15 45.63 +26 38 49.6
1974d Dec. 23.28356 8 28 52.63 +24 43 03.7
1974g Dec. 12.05059 1 26 35.87 +26 25 13.4
1975 March 3 (2753) Brian G. Marsden
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