Central Bureau for Astronomical Telegrams
IAUC 2913: MX0513-40; 1975 YA; 1975k
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Read IAUC 2914
Circular No. 2913
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
MX0513-40
C. Jones and W. Forman, Center for Astrophysics, communicate:
"An x-ray outburst has been observed, localized to a region of
approximately 0o.5 by 10o centered on MX0513-40 = NGC 1851. On 1972
Sept. 19 the source was observed by Uhuru for 15s with a peak rate
of one-quarter that of the Crab over the energy range 2-6 keV. The
source was not detected above 1 percent of the Crab in observations
5m before and after this event. During the 15s observation the
intensity of the source was relatively constant, although the
spectrum was observed to harden significantly. This event, taken
together with that reported by Grindlay and Heise (IAUC 2879) from
3U 1820-30 = NGC 6624, suggests that x-ray bursts may be a common
feature associated with globular clusters, although the longer duration
of this event indicates that a variety of temporal behavior is
possible. Continued monitoring of this, and other globular clusters,
is required to understand the origin of these events."
1975 YA
Further positions have been reported as follows:
1976 UT R. A. (1950) Decl. Observer
Jan. 7.06032 21 17 03.75 +55 05 57.7 Schwartz
27.08889 21 03.76 +47 26.5 Roemer
Feb. 3.09375 21 02.09 +46 10.0 "
G. Schwartz and J. H. Bulger (Harvard College Observatory, Agassiz
Station). 155-cm reflector. Measurer: C. Y. Shao.
E. Roemer (University of Arizona). Steward Observatory's 229-cm
reflector, Kitt Peak, on Jan. 27 (D. Daniels assisting), Lunar
and Planetary Laboratory's 154-cm reflector on Feb. 3.
The following improved elements, by the undersigned, are based
on 19 observations 1975 Dec. 27 to 1976 Feb. 3:
T = 1976 Feb. 14.880 ET
Peri. = 61.555 e = 0.29886
Node = 93.741 1950.0 a = 1.29166 AU
Incl. = 64.043 n = 0.671401
q = 0.90564 AU P = 1.47 years
1976 ET R. A. (1950) Decl. Delta r Mag.
Mar. 3 21 00.28 +41 12.6 1.009 0.921 18.8
13 21 01.50 +39 24.4
23 21 03.38 +37 33.3 1.072 0.974 18.9
Apr. 2 21 05.59 +35 39.0
12 21 07.56 +33 37.9 1.009 1.053 19.0
22 21 08.68 +31 22.9
May 2 21 08.00 +28 40.5 0.843 1.145 18.8
12 21 04.12 +25 05.1
22 20 54.94 +19 48.5 0.614 1.239 18.2
27 20 47.31 +16 06.0
June 1 20 36.84 +11 18.7 0.497 1.285 17.6
6 20 22.74 + 5 05.9
11 20 04.11 - 2 49.8 0.403 1.330 16.9
16 19 40.07 -12 25.6
21 19 10.12 -22 56.0 0.368 1.373 16.3
26 18 34.78 -32 54.6
July 1 17 56.22 -41 01.1 0.414 1.413 16.7
6 17 17.94 -46 46.8
11 16 43.37 -50 30.5 0.524 1.451 17.5
16 16 14.54 -52 48.1
21 15 51.94 -54 11.7 0.666 1.486 18.3
Mag. = 17.5 + 5 log Delta + 5 log r + 0.023 (phase angle)
COMET SUZUKI-SAIGUSA-MORI (1975k)
Further precise positions have been reported as follows:
1975/76 UT R. A. (1950) Decl. m2 Observer
Oct. 29.19722 13 22 22.30 +14 09 22.7 Ferreri
29.20087 13 22 28.38 +14 07 21.8 "
Nov. 9.36315 20 38 52.12 -54 50 53.0 Kilmartin
9.36826 20 38 55.89 -54 50 48.1 "
10.39435 20 50 48.76 -54 35 18.9 (11.5) Austin
11.36132 20 59 58.29 -54 20 17.0 Kilmartin
11.36480 21 00 00.02 -54 20 13.8 "
13.43239 21 14 56.20 -53 49 28.8 (11.5) Austin
14.41469 21 20 28.00 -53 36 08.9 (11) "
15.42489 21 25 23.01 -53 23 24.7 (11) "
28.42829 21 58 17.27 -51 36 07.0 Gilmore
28.44838 21 58 19.10 -51 35 58.8 "
Dec 4.12571 22 06 13.92 -51 06 30.2 Torres
5.43244 22 07 51.91 -51 00 27.3 13.6 Gilmore
6.46992 22 09 08.16 -50 55 47.8 13.6 "
Jan. 4.43321 22 41 20.36 -49 22 57.3 16.1 "
W. Ferreri (Pino Torinese Observatory).
P. M. Kilmartin and A. C. Gilmore (Carter Observatory) and R. R. D.
Austin (Mount John University Observatory). Measurer: Kilmartin.
C. Torres (University of Chile, Cerro El Roble Station).
1976 February 20 (2913) Brian G. Marsden
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