Central Bureau for Astronomical Telegrams
IAUC 4602: PSR 0021-72A AND 0021-72B; 1988a
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4603
Circular No. 4602
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PSR 0021-72A AND 0021-72B
J. G. Ables and C. E. Jacka, CSIRO Division of Radiophysics; D.
McConnell, P. A. Hamilton and P. M. McCulloch, University of Tasmania;
and P. J. Hall, University of Sydney, telex: "We report the discovery of
two millisecond binary pulsars in the globular cluster 47 Tuc in data
taken at the Parkes radio telescope at an observing frequency of 430 MHz
in 1987 Nov. and 1988 Feb. For the first one, PSR 0021-72A, the pulsar
period P, orbital period PB, projected orbital semimajor axis a sin i,
orbital eccentricity e and dispersion measure D are as follows: P =
4.478953 ms, PB = 1924.3 +/- 0.3 s (the shortest known for a radio
binary pulsar), a sin i = 585 km, e = 0.33, D = 65 pc/cm3. For the
second one, PSR 0021-72B, P = 6.127 ms, 7 < PB < 95 days, D = 65 pc/cm3."
COMET LILLER (1988a)
Continuation to the ephemeris on IAUC 4569:
1988 ET R.A. (1950) Decl. Delta r m1
June 8 10 59.96 +50 48.0 1.425 1.473 9.0
13 11 15.22 +45 33.6
18 11 27.47 +40 44.7 1.597 1.605 9.6
23 11 37.75 +36 21.6
28 11 46.69 +32 23.1 1.802 1.737 10.2
July 3 11 54.68 +28 46.9
8 12 01.99 +25 30.7 2.026 1.869 10.7
13 12 08.79 +22 32.3
18 12 15.21 +19 49.5 2.263 2.000 11.3
23 12 21.34 +17 20.3
28 12 27.23 +15 03.1 2.503 2.130 11.8
Aug. 2 12 32.94 +12 56.4
7 12 38.50 +10 58.9 2.743 2.258 12.2
Total visual magnitude estimates: May 11.19 UT, 6.0 (C. S. Morris,
La Canada, CA, 20 x 80 binoculars); 12.02, 5.9 (A. Pereira, Linda-a-
Velha, Portugal, 9 x 34 binoculars); 13.92, 6.3 (J. Shanklin,
Cambridge, England, 7 x 50 binoculars); 15.24, 6.1 (Morris,
Lockwood Valley, CA, 20 x 80 binoculars; 4 deg tail in p.a. 45
deg); 16.04, 6.0 (D. W. E. Green, Cambridge, MA, 7 x 50 binoculars);
17.95, 6.3 (Pereira); 19.46, 6.3 (Morris, near Mt. Wilson, CA;
2 deg tail); 21.43, 6.4 (Morris, Whitaker Peak, CA; 2 deg tail).
1988 May 24 (4602) Brian G. Marsden
Read IAUC 4603
Our Web policy. Index to the CBAT/MPC/ICQ pages.
