Central Bureau for Astronomical Telegrams
IAUC 2765: X-RAY SOURCES; 1975b; 1975a; IAUC 2755
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Read IAUC 2766
Circular No. 2765
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
X-RAY SOURCES
T. H. Markert, H. V. Bradt, G. W. Clark, W. H. G. Lewin, F. K.
Li, H. W. Schnopper, G. F. Sprott and G. F. Wargo, Department of
Physics and Center for Space Research, Massachusetts Institute of
Technology, write: "Between 1971 Sept. 29 and 1974 May 18 the
M.I.T. OSO-7 x-ray experiment discovered the following previously
unreported sources:
Source R.A. (1950) Decl. (1950) Intensity
MX0050+59 0h50m5 +/- 2m5 +59o2 +/- 0o4 1.7 +/- 0.3
MX0600+46 6 00.2 +/- 3.5 +46.5 +/- 0.6 0.8 +/- 0.1
MX0836-42 8 36.2 +/- 0.8 -42.6 +/- 0.2 9.1 +/- 1.0
MX1329-31 13 29.3 +/- 2.4 -31.4 +/- 0.5 1.0 +/- 0.1
MX1347-32 13 47.2 +/- 2.0 -32.1 +/- 0.6 1.1 +/- 0.1
MX1353-64 13 53.9 +/- 0.6 -64.5 +/- 0.1 9.9 +/- 1.2
MX1406-61 14 06.9 +/- 1.5 -61.9 +/- 0.3 3.4 +/- 0.2
MX1418-61 14 18.5 +/- 1.8 -61.4 +/- 0.2 3.1 +/- 0.6
MX1709-40 17 09.3 +/- 0.7 -40.6 +/- 0.2 8.8 +/- 1.2
MX1716-31 17 16.2 +/- 3.2 -31.8 +/- 0.2 6.5 +/- 1.0
MX1746-20 17 46.0 +/- 0.5 -20.4 +/- 0.1 31.1 +/- 3.6
MX2140-60 21 40.9 +/- 5.6 -60.2 +/- 0.6 0.8 +/- 0.2
MX2244-24 22 44.4 +/- 2.5 -24.2 +/- 0.5 2.8 +/- 0.8
MX2321-23 23 21 +/- 8 -23 +/- 2 0.3 +/- 0.1
The Intensity is the approximate peak intensity (in units of 10**-10
erg cm**-2 s**-1 keV**-1) at 2 to 6 keV. The positional uncertainties
are at approximately the 90-percent confidence level. We note that
three of the sources (MX1353-64, MX1406-61 and MX1418-61) are contained
within the 3o error circle for the transient source reported
by Wheaton et al. on IAUC 2761."
PERIODIC COMET WEST-KOHOUTEK-IKEMURA (1975b)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Mar. 3.44375 2 55 44.48 +17 50 42.4 Kojima
3.46354 2 55 47.51 +17 51 19.9 "
7.48889 3 06 23.32 +20 00 56.1 12 Seki
7.49722 3 06 24.67 +20 01 10.3 "
10.18160 3 13 40.51 +21 24 55.1 Hestir
10.19410 3 13 42.89 +21 25 17.2 "
14.16979 3 24 47.10 +23 25 08.0 "
14.17951 3 24 48.90 +23 25 28.2 "
16.49618 3 31 26.12 +24 32 51.1 13.5 Seki
16.50347 3 31 27.44 +24 33 05.6 "
N. Kojima (Ishiki) and T. Seki (Kochi Observatory, Geisei Station).
31-cm and 40-cm reflectors. Measurer: Seki. From Orient.
Astron. Assoc. Comet Bull. Nos. 100 and 101.
K. Hestir (Joint Observatory for Cometary Research). 37-cm f/2
Schmidt camera. Measurer: E. F. Tedesco.
The following total visual magnitude estimates have been
reported: Mar. 8.1 UT, 13 (D. Fellers, Topeka, Kansas, 35.5-cm
reflector); 16.06, 12.6 (J. Bortle, Brooks Observatory, 32-cm
reflector).
PERIODIC COMET BOETHIN (1975a)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Feb. 28.76448 2 55 57.10 +22 26 11.9 13 Mrkos
28.77212 2 55 59.24 +22 26 21.4 "
Mar. 3.53264 3 07 54.3 +23 18 34 14 Seki
7.51111 3 24 53.15 +24 26 06.0 14.5 "
10.22813 3 36 20.10 +25 07 05.3 Hestir
14.15590 3 52 37.45 +25 59 09.6 "
16.53681 4 02 19.9 +26 26 51 15.5 Seki
A. Mrkos (Klet Observatory).
T. Seki (Kochi Observatory, Geisei Station). Comet very diffuse on
Mar. 16. From Orient. Astron. Assoc. Comet Bull. No. 101.
K. Hestir (Joint Observatory for Cometary Research). 37-cm f/2
Schmidt camera. Measurer: E. F. Tedesco.
The following improved orbital elements, by B. G. Marsden, are
from 33 observations Feb. 5 to Mar. 16:
T = 1975 Jan 5.618 ET
Peri. = 11.110 e = 0.77853
Node = 26.985 1950.0 a = 4.93749 AU
Incl. = 5.911 n = 0.089835
q = 1.09350 AU P = 10.97 years
IAUC 2755
A number of subscribers have reported that they did not
receive IAUC 2755. This was the issue dated Mar. 5, from which the
number was accidentally removed in the course of printing.
1975 April 10 (2765) Brian G. Marsden
Read IAUC 2766
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