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IAUC 4880: TWO Millisec PULSARS IN M5; UV Per; 1989 OB

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IAUC number 

                                                Circular No. 4880
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


TWO MILLISECOND PULSARS IN M5
     A. Wolszczan, Arecibo Observatory; and S. Anderson, S. Kulkarni,
and T. Prince, California Institute of Technology, report:  "We
have discovered two millisecond pulsars, PSR 1516+02A and PSR
1516+02B in the direction of the globular cluster M5 (NGC 5904).
Both objects have a dispersion measure of 29.5 +/- 1 pc cmE-3,
and their periods are 5.5 ms and 7.9 ms, respectively.  Observations
were made with the 305-m Arecibo radiotelescope at 430 MHz using
the 40-MHz correlation spectrometer.  The data were analyzed on
the IBM 3090 supercomputer of the Cornell National Supercomputer
Facility.  PSR 1516+02B is a binary pulsar with a velocity amplitude
of at least 20 km/s.  The estimated 430-MHz flux density of both
pulsars is of the order of 0.5 mJy."


UV PERSEI
     This dwarf nova is undergoing an outburst (the last known
one having occurred in 1988 Oct.), as indicated by the following
visual magnitude estimates:  Oct. 15.83 UT, [12.6 (P. Schmeer,
Bischmisheim, W. Germany); 16.83, 12.3 (G. Poyner, Birmingham,
England); 17.11, 11.7 (Schmeer); 17.71, 12.5 (J. Isles, Limasol,
Cyprus); 17.78, 11.6 (Schmeer); 17.82, 12.6 (G. Hurst,
Basingstoke, England); 18.02, 11.7 (Schmeer).


1989 OB
     Extension to the ephemeris on IAUC 4848, from orbital
elements on MPC 15072:

     1989 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 21    23 12.97    +33 20.1    0.298    1.236    15.5
          26    23 29.29    +33 05.0
          31    23 45.61    +32 34.2    0.333    1.267    15.8
     Nov.  5     0 01.67    +31 51.7
          10     0 17.28    +31 01.5    0.379    1.307    16.1
          15     0 32.32    +30 07.1
          20     0 46.72    +29 11.5    0.439    1.354    16.5
          25     1 00.48    +28 17.0
          30     1 13.65    +27 25.6    0.514    1.407    16.9
     Dec.  5     1 26.29    +26 38.8
          10     1 38.46    +25 57.2    0.603    1.465    17.4


1989 October 18                (4880)             Daniel W. E. Green

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