Central Bureau for Astronomical Telegrams
IAUC 4046: SNe; GX 5-1: A Poss. Millisec PERIOD NEUTRON STAR?; N Vul 1984 No. 1; TIME ADJUSTMENT ON 1985 JUNE 30
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Circular No. 4046
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
SUPERNOVAE
L. Cameron, Las Campanas Observatory, informs us that SN 1985E
(IAUC 4041) is in the galaxy ESO 510-G48, not ESO 510-G50. Its
position is R.A. = 14h02m06s, Decl. = -26deg06'5 (equinox 1985.2). The
object was confirmed spectroscopically on Mar. 13 by W. Krzeminski
as being a supernova of type II.
H. Kosai, Tokyo Astronomical Observatory, provides an accurate
position for SN 1985B, measured from the Feb. 15 Kiso Schmidt plate
(IAUC 4038): R.A. = 12h00m10s33, Decl. = +2deg15'27"5 (equinox 1950.0).
GX 5-1: A POSSIBLE MILLISECOND PERIOD NEUTRON STAR?
M. A. Alpar, University of Illinois; and J. Shaham, Columbia
University, communicate: "If the quasiperiodic oscillations in the
accreting variable source GX 5-1 (IAUC 4043) occur at the difference
between the Keplerian frequency of matter orbiting at the
instantaneous Alfven radius and the spin frequency of the underlying
neutron star, assumed to be spinning at the steady-state rate (
Alpar and Shaham 1985, to be published), then the neutron star can
be calculated to have a steady-state period of roughly 6 ms and a
magnetic field of roughly 4 x 10**9 G. For the average accretion
rate in GX 5-1 these values are consistent with the model suggesting
that galactic bulge sources are progenitors of millisecond pulsars.
Even though detection of stellar spin may be difficult, we
urge that a renewed search be made for such periods in this and
similar x-ray sources."
NOVA VULPECULAE 1984 No. 1
Visual magnitude estimates: Jan. 5.73 UT, 10.2 (M. Verdenet,
Bourbon-Lancy, France); 6.72, 10.0 (Verdenet); 24.74, 10.4 (
Verdenet); 27.74, 10.5 (Verdenet); Feb. 21.44, 10.4 (J. Bortle,
Stormville, NY); 23.2, 10.5 (Verdenet); 24.2, 10.6 (Verdenet).
TIME ADJUSTMENT ON 1985 JUNE 30
The Bureau International de l'Heure, Paris, informs us that a
positive leap second will be introduced such that the sequence of
UTC second markers will be: 1985 June 30d23h59m59s, 30d23h59m60s,
July 1d00h00m00s. From 1983 July 1 to 1985 June 30 the difference
UTC-TAI = -22s; beginning 1985 July 1 UTC-TAI = -23s.
1985 March 21 (4046) Brian G. Marsden
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