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IAUC 4089: 1985i; 1985g; PSR 0833-45; U Aqr

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IAUC number 

                                                  Circular No. 4089
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


PERIODIC COMET SHAJN-SCHALDACH (1985i)
     J. V. Scotti, Lunar and Planetary Laboratory, reports the
following measurements from images obtained by T. Gehrels with the
SPACEWATCH camera 0.91-m telescope at Kitt Peak.  The comet appears
to be very slightly diffuse and is close to predictions by S. W.
Milbourn and S. Nakano (MPC 9772; see also Nakano Note No. 450):

      1985 UT             R.A.   (1950.0)    Decl.      m1

      July 25.34578     20 06 22.81     -13 40 57.6     19
           25.35582     20 06 22.30     -13 40 59.7
           25.36924     20 06 21.65     -13 41 01.9
           26.28132     20 05 40.44     -13 44 13.4
           26.29189     20 05 39.94     -13 44 16.1
           26.30332     20 05 39.33     -13 44 18.5


PERIODIC COMET GICLAS (1985g)
     S. Nakano, Tokyo, informs us that this comet was independently
recovered by T. Seki, Geisei, as shown below.  The comet's images
were strongly condensed, evidently almost stellar in appearance.

     1985 UT             R.A.   (1950.0)   Decl.        m1

     July 22.75694      1 51 28.5      + 3 03 39       18.5
          22.77083      1 51 29.7      + 3 03 43


PSR 0833-45
     A. R. Klekociuk, P. M. McCulloch and P. A. Hamilton,
University of Tasmania, report observing an abrupt decrease in the
period of the Vela pulsar PSR 0833-45 around July 12.  The results
were obtained from 635-MHz observations at Hobart during July
1-23.  The fractional change in pulse frequency was 1.601 (+/-
0.001) x 10**-6 and in the frequency derivative was 0.017 +/- 0.001.
The actual jump was not observed, but three possible epochs have
been derived assuming there was no discontinuity in phase at the
time of the jump: July 11.873, 12.520 and 13.166 UT.


U AQUARII
     The following additional visual magnitude estimate (cf. IAUC
4073) was obtained by J. Bortle, Stormville, NY: July 12, 14.2.


1985 July 29                   (4089)              Brian G. Marsden

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