Central Bureau for Astronomical Telegrams
IAUC 4892: Millisec PULSAR IN 47 Tuc; 1989v; 1989r
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Read IAUC 4893
Circular No. 4892
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
MILLISECOND PULSAR IN 47 TUCANAE
R. N. Manchester, Australia Telescope National Facility,
CSIRO; A. G. Lyne, S. Johnston, Jodrell Bank, University of
Manchester; N. D'Amico, University of Palermo; J. Lim, Macquarie
University; and D. A. Kniffen, Goddard Space Flight Center,
telex: "We report the discovery of another millisecond pulsar
in the direction of the globular cluster 47 Tuc (cf. IAUC
4602). The pulsar has a heliocentric period of 5.7567 ms and
a dispersion measure of 25 +/- 2 pc/cmE3. It was detected
in observations made with the Parkes radiotelescope at a frequency
of 640 MHz in 1989 July, and confirmed in analyses of earlier
observations made in the 1.4-GHz band with the same telescope
in 1988 May and Sept. The pulsar is either single or in a very
wide binary orbit. At 640 MHz the mean flux density is very
variable: in the detection observation it was about 5 mJy,
whereas in several other observations it was undetected at
< 1 mJy. At 1.4 GHz the mean flux density is about 0.5 mJy.
These flux densities and their variability suggest an
identification of this pulsar with the variable source near the
center of 47 Tuc observed by A. J. Turtle (private communication)
using the Molonglo Observatory synthesis telescope."
COMET HELIN-ROMAN-ALU (1989v)
Total visual magnitude estimates (cf. IAUC 4883): Oct. 23.16
UT, 10.5 (R. A. Keen, Mt. Thorodin, CO, 0.32-m reflector); 24.11,
10.4 (G. Kronk, Troy, IL, 0.33-m reflector); 26.79, 10.2 (J.-C.
Merlin, Le Creusot, France, 0.15-m reflector); 28.13, 9.8 (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector); 28.85, 10.1 (R.
Haver, Mounte Autore, Italy, 15x80 binoculars); 29.87, 10.4 (A.
Pereira, Cabo da Roca, Portugal, 0.15-m reflector); Nov. 1.20,
10.4 (Kronk).
COMET OKAZAKI-LEVY-RUDENKO (1989r)
P. Roques, Williams, AZ, reports the following tail lengths
from Tech Pan exposures: Oct. 1.11 UT, 0.38 deg in p.a. 48 deg;
19.09, 1.60 deg in p.a. 19 deg (also faint, short dust tail in
p.a. 65 deg).
Total visual magnitude estimates (cf. IAUC 4882): Oct. 23.78
UT, 6.9 (Merlin, 7x50 binoculars); 26.02, 6.8 (Kronk); 28.10, 6.9
(Morris, 20x80 binoculars); 29.16, 6.0 (Haver; 2 deg tail in p.a.
0 deg); 30.79, 6.9 (Pereira, 9x34 binoculars).
1989 November 2 (4892) Daniel W. E. Green
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