Central Bureau for Astronomical Telegrams
IAUC 2735: 433 EROS; Var X-RAY SOURCE IN NGC 1851; 1974f; 1973g
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Read IAUC 2736
Circular No. 2735
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
433 EROS
Dr. R. S. Harrington, U.S. Naval Observatory, Washington, provides
the following precise positions, obtained by M. Miranian and
himself with the 38-cm astrograph (stopped down to 23-cm):
1974 UT R. A. (1950) Decl.
Nov. 23.19306 7 17 48.28 +56 28 32.4
23.22986 7 17 53.65 +56 28 43.2
Dec. 15.06181 7 59 09.31 +55 05 14.4
15.08194 7 59 10.47 +55 05 01.3
Dr. P. Herget, Director of the Cincinnati Observatory, has
sent an independent prediction for the occultation of kappa Gem A on
1975 Jan. 24.0 UT. This prediction, based on observations between
1926 and 1974 Nov. 18, differs somewhat from that on IAUC 2722 and
is as follows:
UT Long. Lat. UT Long. Lat. UT Long. Lat.
0h17m7 +84o30 +50o00 0h20m8 +71o20 +42o00 0h31m4 +61o33 +10o00
0 18.6 +79.66 +48.00 0 21.6 +69.34 +40.00 0 34.2 +62.90 0.00
0 19.4 +76.19 +46.00 0 25.0 +63.63 +30.00 0 36.8 +66.16 -10.00
0 20.1 +73.44 +44.00 0 28.2 +61.42 +20.00
The reason for the discrepancy is principally that there is a
difference of some 2" between the assumed geocentric right ascensions
of the minor planet. Further high-quality astrometric observations
of both the minor planet and the star are urgently desired. It is
hoped that the discordance between the predictions can soon be
resolved, but in the mean time, potential observers should note that
the uncertainty in the predicted track for the occultation is
larger than indicated on IAUC 2722.
VARIABLE X-RAY SOURCE IN NGC 1851
T. Markert and G. Clark, Department of Physics and Center for
Space Research, Massachusetts Institute of Technology, write: "A
variable x-ray source has been discovered in the globular cluster
NGC 1851. The observations were made at several times during 1971-73
by the M.I.T. detectors on the OSO-7 satellite. The source position
is R.A. = 5h13m.4 +/- 0m.7, Decl. = -40o06' +/- 8' (equinox 1950.0; l =
74o, b = -3o). NGC 1851 lies near the edge of the 1-sigma error ellipse
and is the only NGC or 3C object within 2o. The energy flux in the
range from 3 to 10 keV changed from less than 8 x 10**-11 to approximately
3.5 x 10**-10 erg cm**-2 s**-1 between two observations separated
by 10 days. The high value corresponds to an x-ray luminosity of
3 x 10**36 erg s**-1 at the distance of 9.5 kpc estimated for the
cluster by G. Alcaino (1971, Astron. Astrophys. 15, 360)."
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1974f)
Mr. T. Seki, Kochi Observatory, Geisei Station, provides the
following precise positions. The comet was diffuse, with central
condensation.
1974 UT R. A. (1950) Decl. m1
Dec. 10.41181 19 55 25.11 -14 20 24.4 9.5
10.42292 19 55 27.37 -14 20 28.4
The following visual total magnitude estimates have been
reported: Dec. 14.99 UT, 9.3 (D. Green, Boone, North Carolina, 20-cm
reflector, 43 x); 16.99, 9.2 (Green); 18.00, 9.4 (C. Sherrod, North
Little Rock, Arkansas, 15-cm refractor, 60 x); 18.01, 8.8 (K.
Simmons, Switzerland, Florida, 20-cm reflector); 19.00, 9.2 (Green);
19.00, 9.0 (Simmons, 14 x 100 binoculars); 19.98, 9.1 (Green);
20.01, 9.1 (Sherrod); 21.01, 9.0 (Sherrod); 21.99, 9.0 (Green);
23.00, 8.6 (Sherrod). Moonlight interfered from Dec. 18 onward.
PERIODIC COMET REINMUTH 2 (1973g)
The following precise positions have been reported:
1974 UT R. A. (1950) Decl. m1 Observer
Oct. 15.62083 3 35 59.38 +30 15 08.1 16 Tsuchiya
Nov. 11.63479 3 13 44.43 +28 54 42.8 15 Seki
14.69375 3 10 52.91 +28 37 52.5 15 "
16.30017 3 09 24.75 +28 28 34.3 17.5 Shao
17.10325 3 08 41.54 +28 23 49.9 Schwartz
18.13084 3 01 46.41 +28 17 40.9 "
19.07542 3 06 56.52 +28 11 56.7 "
23.16478 3 03 29.64 +27 46 28.3 "
K. Tsuchiya (JCPM Asahikawa). Coma diameter ~ 0'.1. Measurer: T.
Urata. From Nihondaira Obs. Circ. No. 611.
T. Seki (Kochi Observatory, Geisei Station).
C. Y. Shao and G. Schwartz (Harvard College Observatory, Agassiz
Station). 155-cm reflector. Measurer: Shao.
1974 December 30 (2735) Brian G. Marsden
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