Central Bureau for Astronomical Telegrams
IAUC 5321: P/SCHWASSMANN-WACHMANN 1; PSR 0540-69; V919 Sgr; N Cen 1991
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Read IAUC 5322
Circular No. 5321
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following visual magnitude estimates indicate that this
comet is currently undergoing an outburst: Aug. 6.4 UT, 15 or brighter
(R. E. McCrosky, Oak Ridge Observatory, 1.5-m reflector + CCD); 8.06,
11.8: (H. Mikuz, Ljubljana, Yugoslavia, 0.36-m reflector); 8.41, 12.1
(A. Hale, Las Cruces, NM, 0.41-m reflector); 9.08, 12.3 (Mikuz).
A. Cochran, Astronomy Department, University of Texas, informs us
that, in view of this outburst, she will be obtaining observations of
the comet with the International Ultraviolet Explorer satellite late on
Aug. 10 UT. She would appreciate any support observations, especially
colors or spectra, that can be obtained and communicated to her (e-
mail anita@astro.as.utexas.edu, telephone 512-471-1471).
PSR 0540-69
H. Ogelman, G.Hasinger and J. Trumper, Max-Planck-Institut fur
Extraterrestrische Physik, Garching, communicate: "The large glitch in
the rotation rate of the pulsar PSR 0540-69 that we reported on IAUC
5162 was merely an artifact of a misinterpretation of the ROSAT orbit
data, which in turn affected the barycentric corrections. In fact,
the corrected data yield the barycentric frequency of 19.8534567 +/-
0.0000003 Hz at the epoch 1990 June 19.6465 UT, which is within the
extrapolation range of the GINGA ephemeris (Nagase et al. 1990, Ap.J.
351, L13)."
V919 SAGITTARII
U. Munari, Asiago Astrophysical Observatory, reports:
"Photoelectric photometry of V919 Sgr performed on 1990 June 23 by G.
Massone (Turin Observatory) at the ESO 1.0-m telescope gives V =
11.76, B-V = +0.77, U-B = -0.51, V-R = +0.82, V-I = +1.93, which are
similar to those reported on IAUC 5317, where an outburst is announced."
NOVA CENTAURI 1991
Photometry by A. C. Gilmore, Mt. John University Observatory:
Aug. 3.50 UT, V = 13.38 +/- 0.03, B-V = +1.6 +/- 0.3 (badly affected
by aurora).
1991 August 9 (5321) Brian G. Marsden
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