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IAUC 4708: 1989c; 1989a; 1988r; PSR 0833-45

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IAUC number 

                                                  Circular No. 4708
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


COMET BRADFIELD (1989c)
     Further precise positions by D. Herald, Kambah, near Canberra:

     1989 UT             R.A. (1950) Decl.
     Jan.  8.45465   21 31 12.23   -55 25 36.1
           8.46622   21 31 20.10   -55 25 16.5

The distribution of reference-star positions was poor in declination.


COMET YANAKA (1989a)
     Total visual magnitude estimates: Jan. 4.50 UT, 11.1 (G. Kronk,
Troy, IL, 0.33-m reflector); 5.25, 10.6 (A. Pereira, Linda-a-Velha,
Portugal, 0.15-m reflector); 5.44, 10.7 (J. E. Bortle, Stormville, NY,
0.32-m reflector); 5.49, 11.0 (A. Hale, Las Cruces, NM, 0.41-m reflector.


COMET YANAKA (1988r)
     Total visual magnitude estimates: Jan. 3.46 UT, 9.6 ((J. E. Bortle,
Stormville, NY, 0.32-m reflector; correction to IAUC 4698); 4.49, 9.3
(G. Kronk, Troy, IL, 0.33-m reflector; 7' tail in p.a. 300 deg); 5.45, 9.7
(Bortle); 5.53, 9.8: (A. Hale, Las Cruces, NM, 0.41-m reflector).


PSR 0833-45
     With reference to the note on IAUC 4695, P. A. Hamilton, E. A.
King, D. McConnell and P. M. McCulloch, Physics Department, University
of Tasmania, communicate: "We report the first actual observation of a
period jump in the Vela pulsar.  A glitch occurred on 1988 Dec. 24.8037
(+/- 0.0002) UT and was observed with the 635 MHz and 950 MHz
polarimeter on our 14-m diameter antenna dedicated to monitoring this
pulsar.  The observations consist of consecutive superposed-epoch
integrations from which mean arrival times are determined, each
integration being for 2 min (1344 pulse periods).  The glitch occurred
11.3 hr after the source rose and 6.0 hr before it set.  Preliminary
values for the period, before and after the glitch, for infinite
observing frequency at the solar system barycenter, are 0.08928588157
+/- 0.00000000004 and 0.089285719 +/- 0.000000001 s, respectively.  The
speed-up time was less than 2 min."


1989 January 8                 (4708)              Brian G. Marsden

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