Central Bureau for Astronomical Telegrams
IAUC 2770: Her X-1; 1975e; 1975c; P/WESTPHAL
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Read IAUC 2771
Circular No. 2770
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
HERCULES X-1
Dr. B. A. Cooke, Leicester University, reports that Her X-1
has been detected during an extended low period with the 3 to 20
keV sky-survey experiment on Ariel 5. The detection occurred
approximately midway between two observed regular on-states with an
onset near 1975 Jan. 17.6 UT.
COMET SMIRNOVA-CHERNYKH (1975e)
Further positions have been reported as follows:
1975 UT R. A. (1950) Decl. Observer
Apr. 11.34097 9 15 15.56 +23 40 32.6 Roemer
15.06175 9 15.9 +23 31 McCrosky
Elizabeth Roemer (Lunar and Planetary Laboratory, Catalina Station).
154-cm reflector. Measurer: Carolyn C. McCarthy.
R. E. McCrosky (Harvard College Observatory). 155-cm reflector.
Dr. D. Ya. Martynov, Sternberg Astronomical Institute, cables
the following ephemeris by G. R. Kastel', Institute for Theoretical
Astronomy, Leningrad. The suggestion (IAUC 2769) that the comet is
a short-period one is confirmed.
1975 ET R. A. (1950) Decl. Delta r
Apr. 18 9 16.6 +23 24
28 9 20.0 +22 53 3.295 3.585
May 8 9 25.1 +22 16
18 9 31.5 +21 31 3.573 39580
28 9 39.2 +20 41
PERIODIC COMET KOHOUTEK (1975c)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Mar. 19.04144 5 26 34.08 +20 31 44.6 Schwartz
Apr. 3.50729 6 08 37.54 +20 13 31.3 14 Seki
G. Schwartz (Harvard College Observatory). Measurer: C. Y. Shao.
T. Seki (Kochi Observatory, Geisei Station).
PERIODIC COMET WESTPHAL
Dr. E. I. Kazimirchak-Polonskaya, Institute for Theoretical
Astronomy, Leningrad, communicates the following prediction, by
L. M. Belous, from a fit to observations in 1852-53 and 1913.
Perturbations by Mercury to Pluto were applied, and some attempt was
made to allow for nongravitational effects. Somewhat similar
predictions, by H. J. Carr (T = 1976 Jan. 3.828 ET) and by S. Nakano
and Y. Banno (T = 1976 Jan. 5.659 ET), are given in Handb. Br.
Astron. Assoc. for 1975 and in Nihondaira Obs. Circ. No. 586,
respectively. The effects of unknown nongravitational effects may
well exceed the differences among the predictions. It should be
noted that the comet faded out before reaching perihelion in 1913.
T = 1975 Dec. 26.9002 ET Epoch = 1974 Oct. 20.0 ET
Peri. = 56.8965 e = 0.919373
Node = 347.2790 1950.0 a = 15.63929 AU
Incl. = 40.7742 n = 0.0159360
q = 1.26094 AU P = 61.85 years
For dT = +1d
1975/76 ET R. A. (1950) Decl. Delta r dR.A. dDecl. m1
May 28 23 08.78 -38 46.5 2.787 3.021 -0m62 -11'3 16.0
June 7 23 17.45 -38 33.9 -0.68 -12.5
17 23 24.53 -38 31.0 2.356 2.821 -0.75 -13.8 15.4
27 23 29.60 -38 38.2 -0.84 -15.3
July 7 23 32.09 -38 55.3 1.948 2.619 -0.95 -16.8 14.6
17 23 31.29 -39 20.4 -1.08 -18.3
27 23 26.34 -39 48.7 1.584 2.416 -1.23 -19.7 13.8
Aug. 6 23 16.37 -40 11.4 -1.38 -21.0
16 23 00.71 -40 13.2 1.287 2.213 -1.51 -22.0 13.0
26 22 39.59 -39 32.8 -1.57 -22.8
Sept. 5 22 14.61 -37 47.3 1.083 2.013 -1.52 -23.8 12.2
15 21 48.87 -34 41.7 -1.34 -25.5
25 21 25.91 -30 19.2 0.990 1.818 -1.09 -28.1 11.6
Oct. 5 21 08.19 -24 59.6 -0.81 -31.4
15 20 56.69 -19 08.8 0.993 1.636 -0.56 -34.9 11.1
25 20 51.11 -13 07.9 -0.35 -38.1
Nov. 4 20 50.66 - 7 08.1 1.050 1.475 -0.18 -40.8 10.8
14 20 54.51 - 1 12.9 -0.04 -43.0
24 21 01.92 + 4 38.9 1.119 1.349 +0.06 -44.8 10.5
Dec. 4 21 12.45 +10 30.4 +0.14 -46.1
14 21 25.92 +16 25.0 1.175 1.275 +0.17 -47.2 10.4
24 21 42.43 +22 25.6 +0.16 -48.0
Jan. 3 22 02.44 +28 32.7 1.214 1.265 +0.08 -48.5 10.4
m1 = 9.0 + 5 log Delta + 10 log r
1975 April 23 (2770) Brian G. Marsden
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