Central Bureau for Astronomical Telegrams
IAUC 6486: 4U 1145-61; EUV DETECTIONS OF COMETS; C/1996 E1
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Circular No. 6486
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
4U 1145-61
R. Corbet, Goddard Space Flight Center (GSFC) and Universities
Space Research Association; and R. Remillard, Massachusetts
Institute of Technology (MIT), report for the RXTE ASM Team at GSFC
and MIT: "The Be/neutron binary star 4U 1145-61 (= 2S 1145-619) is
experiencing an outburst. The outburst commenced on Sept. 29 UT
rising suddenly to 43 +/- 4 mCrab (2-12 keV), and daily detections
continue through Oct. 8 with variable daily averages between 55 and
116 mCrab. This brightening is consistent with the 186.5-day
period proposed by Warwick et al. (1985, Space Sci. Rev. 40, 429).
However, during the previous predicted outburst at Mar. 31, any
flare was significantly weaker than the current event. ASM lightcurves
are available via http://heasarc.gsfc.nasa.gov/docs/xte/xte_1st.html."
EXTREME-ULTRAVIOLET DETECTIONS OF COMETS
J. P. Pye and R. G. West, Leicester University; and K. Dennerl,
Max-Planck-Institut fur Extraterrestrische Physik, Garching, report
the discovery of extreme-ultraviolet (EUV) emission from two comets
in data acquired by the Wide-Field Camera (WFC) during the ROSAT
all-sky survey. Accompanying x-ray emission has previously been
reported by Dennerl et al. (IAUC 6413). Significant EUV detections
have been made in the following observing intervals: C/1990 K1
(Levy), 1990 Sept. 6.50-7.43 UT, 1991 Jan. 9.96-11.96, and Jan.
17.36-18.02; C/1990 N1 (Tsuchiya-Kiuchi), 1990 Nov. 18.16-20.70.
All detections were made in the WFC S1 filter, nominal passband 90-
206 eV (14-6 nm). The upper-limit countrates derived for the WFC
S2 filter (passband 62-110 eV; 20-11 nm), when compared with the S1
measurements, yield spectral parameters consistent with those
previously reported for some comets (IAUC 6394, 6404).
COMET C/1996 E1 (NEAT)
Total (visual) magnitude estimates (L = reflector): Aug. 4.91
UT, 11.3 (R. J. Bouma, Groningen, The Netherlands, 0.25-m L);
23.46, 11.7 (A. Hale, Cloudcroft, NM, 0.41-m L); Sept. 7.91, 10.9
(A. Baransky, Kiev, Ukraine, 0.11-m L); 17.13, 12.2 (G. W. Kronk,
Troy, IL, 33.3-cm L); Oct. 3.91, 14.5 (H. Mikuz, Ljubljana,
Slovenia, 0.36-m L + CCD + V filter).
(C) Copyright 1996 CBAT
1996 October 9 (6486) Daniel W. E. Green
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