Central Bureau for Astronomical Telegrams
IAUC 2969: X-RAY BURSTS FROM Per; SAO 243166; Occn OF SAO 80046 BY IAPETUS; 1976h
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Circular No. 2969
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 BURSTS FROM PERSEUS
R. D. Belian, J. P. Connor and W. D. Evans, Los Alamos Scientific
Laboratory, report the identification of 15 intense x-ray
bursts from a location in Perseus. The bursts, observed by the
Vela 5 satellites between May 1969 and Apr. 1973, varied in intensity
over ~ 0.5-2.0 Crab in the energy range 3-12 keV, and the
spectra were generally very hard compared to the Crab. The burst
durations were > 2s and < 128s. The average of the locations is R.A.
= 3h11m, Dec. = +42o (equinox 1950.0). The common error box of ~ 4o.5
x 4o contains 3U 0316+41 and the recently reported x-ray source beta
Per (cf. IAUC 2859). If one assumes a 10s burst duration, the
observations suggest an average rate of about 1 burst per day.
SAO 243166
S. Wolff and W. Heacox, University of Hawaii, write that recent
observations of SAO 243166 = HD 142565, the proposed optical
counterpart of MX1553-54 (IAUC 2959), show that the spectrum
closely resembles that of the B0Ia supergiant HR 7482. No emission was
seen in the region 3700-4900 A. The mean radial velocity is -28 +/-
2 km/s, in good agreement with that found by Feast et al. (1957,
Mem. Roy. Astron. Soc. 68, 1). The failure to detect either emission
or velocity variations weakens the proposed identification.
OCCULTATION OF SAO 80046 BY IAPETUS
F. M. Strauss, Universidade Federal do Rio Grande do Sul,
Porto Alegre, writes that visual observations by J. Ducati and
himself indicate that the disappearance occurred on June 16d21h32m24s
UT (cf. IAUC 2948). The duration was at least 15s, after which
time clouds began to interfere. The observation was made from the
location Long. = +3h24m30s, Lat. = -30o03'15" (provisional coordinates).
PERIODIC COMET JOHNSON (1976h)
The following precise position was obtained at the Harvard
College Observatory's Agassiz Station. Measurer: C. Y. Shao.
1976 UT R. A. (1950) Decl. Observer
May 28.25576 17 22 42.41 - 8 06 29.7 R. E. McCrosky
1976 July 2 (2969) Brian G. Marsden
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