Central Bureau for Astronomical Telegrams
IAUC 3704: RADIO PULSAR IN MSH 15-32; P/NEUJMIN 3
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Read IAUC 3705
Circular No. 3704
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 617-864-5758
RADIO PULSAR IN MSH 15-32
P. M. McCulloch and P. A. Hamilton, University of Tasmania;
and J. G. Ables, C.S.I.R.O. Division of Radiophysics, report the
detection of radio pulsations from the x-ray pulsar in SNR MSH
15-52 (Seward and Harnden 1982, Ap. J. 256, L2). The pulsar was
observed at 680 MHz on 1982 Feb. 4 to have a barycentric period of
0s.150212 +/- 0s.000001, dispersion measure 240 +/- 10 cm**-3 pc, pulse
duty cycle 16 percent and mean flux ~ 1 mJy. The above period
agrees with the published period and slow-down rate (47 +/- 2 us/yr)
of the x-ray pulsar, suggesting that it is not part of a binary
system. This pulsar has many features in common with the Crab and
Vela pulsars and is therefore a candidate for optical pulsations.
PERIODIC COMET NEUJMIN 3
It has been brought to our attention that there is a large
discordance between the ephemerides given for this comet in BAA Hbk.
for 1982 and on MPC 6534. It appears that the latter, from the
elements in Nakano Note No. 397, is correct. The prediction below
is from a computation by the undersigned that represents 48 observations
at the three observed perihelion passages (1929, 1951, 1972)
with a mean residual of 1".8. Perturbations by all nine planets
were taken into account, and there is no indication that this comet
is influenced by nongravitational forces.
T = 1982 Dec. 6.0440 ET Epoch = 1982 Dec. 17.0 ET
Peri. = 145.1628 e = 0.581320
Node = 169.6914 1950.0 a = 4.919254 AU
Incl. = 3.9375 n = 0.0903348
q = 2.059593 AU P = 10.91 years
1982 ET R. A. (1950) Decl. Delta r m2
May 31 14 24.84 - 8 08.6 1.732 2.642 19.4
June 10 14 20.67 - 7 56.8
20 14 18.78 - 8 00.2 1.798 2.543 19.3
30 14 19.45 - 8 19.3
July 10 14 22.73 - 8 52.8 1.917 2.449 19.3
20 14 28.52 - 9 39.2
30 14 36.71 -10 36.3 2.061 2.361 19.3
Aug. 9 14 47.12 -11 41.7
19 14 59.59 -12 53.0 2.210 2.281 19.3
1982 June 15 (3704) Brian G. Marsden
Read IAUC 3705
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