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IAUC 4762: PULSAR IN GLOBULAR CLUSTER M15; 1989b

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                                                  Circular No. 4762
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


PULSAR IN GLOBULAR CLUSTER M15
     S. Anderson, P. Gorham, S. Kulkarni, T. Prince, California
Institute of Technology; and A. Wolszczan, Arecibo Observatory,
write:  "We report the discovery of a 56-ms pulsar in the globular
cluster M15.  Observations were made with the 305-m Arecibo
reflector at 430 MHz on 1988 Dec. 26.  A time series of 10E7 samples
with a sample time 0.5 ms was padded to 2E24 samples and Fourier-
transformed, using the Caltech NCUBE/10 hypercube supercomputer.
The dispersion measure, 67.2 +/- 2.5 pc/cm3, is consistent with that
of the 110-ms pulsar 2127+11 reported by Wolszczan et al. (1989,
Nature 337, 531).  The new pulsar is within 2' of the center of M15
(NGC 7078).  In 1415-MHz Arecibo data taken one year earlier, the
pulsar is detected with the identical barycentric period at the 5-sigma
level.  Based on these two observations, dP/dt < 5 x 10E-15 s/s.
The flux density is 0.7 +/- 0.1 mJy at 430 MHz."


PERIODIC COMET HELIN-ROMAN-CROCKETT (1989b)
     Orbital elements from MPC 14322:

     T = 1988 Sept. 9.9319 ET         Peri. =   9.5693
     e = 0.140460                     Node  =  91.4380  1950.0
     q = 3.472215 AU                  Incl. =   4.2412
       a =  4.039619 AU    n = 0.1213929    P =   8.119 years

     1989 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 15     8 00.02    +23 57.1    2.884    3.530    14.8
          25     8 00.86    +23 52.6
     Apr.  4     8 03.66    +23 41.9    3.159    3.543    15.0
          14     8 08.27    +23 25.5
          24     8 14.48    +23 03.6    3.457    3.557    15.2
     May   4     8 22.04    +22 36.5
          14     8 30.76    +22 04.3    3.753    3.572    15.4
          24     8 40.42    +21 27.3
     June  3     8 50.84    +20 45.6    4.027    3.587    15.6
          13     9 01.89    +19 59.4
          23     9 13.41    +19 08.9    4.264    3.604    15.7


1989 March 28                  (4762)             Daniel W. E. Green

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