.dvi
or
.ps
format.
Circular No. 6428 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) COMET 1996 N1 A. Hale, Cloudcroft, NM, reports the visual discovery of a comet by Howard Brewington (also of Cloudcroft). Available observations: 1996 UT R.A. (2000) Decl. m1 Observer July 4.177 11 33.5 + 4 06 10 Brewington 4.35560 11 34 01.33 + 4 13 13.7 Garradd 4.35647 11 34 01.49 + 4 13 16.8 " 4.35739 11 34 01.62 + 4 13 20.9 " 4.36856 11 34 03.61 + 4 13 59.6 " 4.36955 11 34 03.73 + 4 14 02.9 " H. J. Brewington (Cloudcroft, NM). 0.20-m reflector. G. J. Garradd (Loomberah, N.S.W.). 0.25-m f/4.1 reflector + CCD. Some cirrus clouds. Coma diameter about 5' on a 300-s exposure. 4U 1636-536 AND 4U 0614+091 M. van der Klis, Astronomical Institute "Anton Pannekoek", University of Amsterdam; J. van Paradijs, University of Amsterdam and University of Alabama in Huntsville; W. H. G. Lewin, Massachusetts Institute of Technology; F. K. Lamb, University of Illinois, Urbana/Champaign; B. Vaughan, California Institute of Technology; E. Kuulkers, Astrophysics Division, ESTEC, European Space Agency; and T. Augusteijn, European Southern Observatory, report: "RXTE observations of 4U 1636-536 performed on Feb. 28.24- 28.35 UT show two simultaneous kHz quasiperiodic oscillations (QPOs) at frequencies of 898.7 +/- 1.4 and 1171 +/- 11 Hz. Power spectral peak widths are 28 +/- 5 and 88 +/- 26 Hz (FWHM), respectively, and root-mean-square amplitudes 6.6 +/- 0.2 and 6.1 +/- 0.7 percent (7-20 keV). The higher-frequency peak is the fastest x-ray QPO yet reported. Two RXTE observations of 4U 0614+091 (cf. IAUC 6426) that were performed on Mar. 16.35-16.46 and Apr. 13.41-13.54 each show a single kHz QPO peak, with frequencies, FWHMs, and rms amplitudes of 727 +/- 5 Hz, 137 +/- 18 Hz, and 15.8 +/- 0.8 percent; and 630 +/- 11 Hz, 126 +/- 27 Hz, and 16.5 +/- 1.5 percent (2-20 keV), respectively." NOVA CASSIOPEIAE 1995 Visual magnitude estimates (cf. IAUC 6358) by M. V. Zanotta, Milan: Apr. 6.85 UT, 9.4; 15.12, 8.5; May 20.87, 9.5; June 10.95, 9.9; 30.06, 10.1. (C) Copyright 1996 CBAT 1996 July 4 (6428) Daniel W. E. Green
.dvi
or
.ps
format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.