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IAUC 5794: N Aql 1993; PSR 1259-63

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                                                  Circular No. 5794
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NOVA AQUILAE 1993
     D. Balam reports the following precise position obtained with
the 0.5-m reflector (+ CCD) at the University of Victoria's Climenhaga
Observatory (mean error 0".2):  R.A. = 19h10m34s.69, Decl. =
 +1 29'14".0 (equinox 1950.0).  Photographic magnitude estimates
from Technical Pan film (+ orange filter) by W. Liller, Vina del
Mar, Chile:  Apr. 26.244 UT, [11.5; May 13.351, 8.7 (independent
discovery); 17.246, 8.2.
     The following Johnson photoelectric data have been reported:
May 17.279 UT, V = 7.90 +/- 0.08, B-V = +0.89 +/- 0.05 (D. Kaiser,
Columbus, IN; comparison star HD 178065); 17.306, V = 7.90 +/-
0.006, B-V = +0.91 +/- 0.008 (Kaiser); May 18.055, V = 8.058 +/-
0.004, U-B = +0.03, B-V = +0.83, V-R = +0.97, V-I = +1.76 (M.
Mikolajewski and B. Wikierski, N. Copernicus University, Torun;
comparison star HR 7313); 18.096, V = 8.22 +/- 0.03, B-V = +0.41
+/- 0.05 (H. Mikuz, Ljubljana, Slovenia; comparison star HR 7313, V
= 6.19, B-V = +0.02).


PSR 1259-63
     S. Johnston and R. Manchester, Australia Telescope National
Facility; A. Lyne, University of Manchester; and N. D'Amico,
University of Palermo, report:  "We have improved parameters for the
binary system containing the pulsar PSR 1259-63 and the Be star SS
2883 (Johnston et al. 1992, Ap.J. 387, L37), obtained from a phase-
connected solution of 1200 days of radio timing data from the
Parkes radio telescope.  The solution yields period 47.762 053 92
ms and period derivative 2.280 x 10E-15 at epoch 1990 June 11.0 UT.
Binary orbital parameters are a(sin i) = 1296.00 light seconds, P =
1236.81 days, e = 0.8698, omega = 138.655 deg, epoch of periastron
1990 Aug. 21.36 UT.  The mass function leads to a minimum companion
mass of 3.2 solar masses.  Based on optical observations, we favor
solutions with a companion mass of about 10 solar masses, implying
that the inclination angle of the orbit to the plane of the sky is
about 36 deg.  The next periastron approach is 1994 Jan. 9.  During
periastron, the pulsar may disrupt the circumstellar disk of the Be
star, resulting in possible x-ray and gamma-ray emission and
changes in the optical brightness and spectral-line profiles of SS
2883.  Monitoring of this system is encouraged around the epoch of
next periastron."


1993 May 18                    (5794)            Daniel W. E. Green

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