Central Bureau for Astronomical Telegrams
IAUC 4162: 1982i; NEW Millisec BINARY PULSAR; Notice
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Circular No. 4162
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
PERIODIC COMET HALLEY (1982i)
A. Tokunaga and D. Griep, University of Hawaii, communicate
the following infrared magnitudes obtained on Jan. 8 at the NASA
Infrared Telescope Facility (aperture 7"3; errors < 0.05 mag): J =
7.7, H = 7.2, K = 7.1, L = 5.1, M = 2.7, N = -1.5, [20.0 microns] =
-2.9. The color temperature of the thermal emission was 350 K.
E. Leibowitz and N. Brosch, Wise Observatory, report: "
Intermediate band photoelectric measurements of the near-nucleus region
on twelve nights in 1985 Nov.-Dec. reveal variations in the intensity
ratio of C2 (514 nm):H2O+ (700 nm) emissions with period ~ 50
hr. The periodic variations in the H2O+ lines appear to be
anticorrelated. The continuum bands at 482.5 and 684.0 nm and their
intensity ratio do not show the ~ 50-hr modulation."
Total visual magnitude estimates: 1985 Dec. 31.10 UT, 4.0 (C.
Spratt, Victoria, BC, 11 x 80 binoculars; tail 75' in p.a. 60);
1986 Jan. 2.97, 4.3 (D. W. E. Green, Cambridge, MA, 7 x 50
binoculars); 4.94, 4.5 (Green); 6.00, 4.8 (J. E. Bortle, Stormville,
NY, 10 x 50 binoculars; tail 2P in p.a. 65); 7.98, 4.8 (W. I.
Nissen, Takoma Park, MD, 7 x 50 binoculars); 9.98, 4.5 (Bortle);
12.10, 4.3 (Spratt; tail 120' in p.a. 60); 13.94, 4.5 (Green).
NEW MILLISECOND BINARY PULSAR
D. J. Segelstein, J. H. Taylor, L. A. Rawley and D. R.
Stinebring, Physics Department, Princton University, report: "The
second-fastest known pulsar has been detected at Arecibo Observatory
during the Princeton/Arecibo pulsar survey. The pulsar is in a
nearly-circular binary orbit and appears to be another instance of
a neutron star 'spun up' by accretion of matter from an evolving
companion star. Parameters of the pulsar are as follows: R.A. =
18h55m17s +/- 6s, Decl. = +9deg40'6 +/- 1'5 (equinox 1950.0); P = 5.3621003
+/- 0.0000001 ms; dispersion measure 13.3 +/- 1 pc cm-E; flux density
~ 20 mJy at 430 MHz and ~ 10 mJy at 1400 MHz. Orbital elements: a
= 9.231 +/- 0.004 light-seconds, e = 0.002, P = 12.33 +/- 0.01 days."
NOTICE TO CONTRIBUTORS
Contributors are advised that it is now possible to communicate
data to the Central Bureau via the BITNET/EARN computer network.
Messages should be sent to user MARSDEN1 on node CFA1.
1986 January 16 (4162) Brian G. Marsden
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