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IAUC 2784: 1975f; A0535+26; 3C 249.1

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IAUC number 

                                                  Circular No. 2784
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


PERIODIC COMET WOLF (1975f)
     Dr. Elizabeth Roemer, University of Arizona, reports that this
comet has been recovered on two plates taken by L. M. Vaughn and
herself with the Steward Observatory's 229-cm reflector on Kitt
Peak.  The very faint images have been measured by Carolyn C.
McCarthy.  These recovery observations confirm that one of two
suspect images found by C. Y. Shao on a single exposure with the 155-cm
reflector at Harvard Observatory's Agassiz Station also belongs
to the comet.  The comet is very close to the predictions by E. I.
Kazimirchak-Polonskaya and D. K. Yeomans on IAUC 2740.

     1975 UT             R. A. (1950) Decl.        m2    Observer
     May  17.30274    21 00 51.28   +13 58 17.3   21     Shao
          17.40312    21 00 55.36   +13 59 25.7  ~22.0   Roemer
          17.44792    21 00 57.12   +13 59 55.6            "


A0535+26
     P. Murdin, Royal Greenwich Observatory, has also suggested (cf.
IAUC 2780) HDE 245770 as a candidate for A0535+26.  He adds: "This
star shows no evidence of variability (B = 10.0 +/- 0.2, B-V ~ +0.5)
on plates taken on May 4 and 5 within a few days of maximum observed
x-ray flux, compared with four archival plates in the R.G.O.
collection.  There is no evidence of variability for any stars within
7' of the source (to limiting magnitude B ~ 14 and considering
variations of not less than 0.2 magnitude), except for the known
variable RR Tau, which is well outside the given error zone.
Nonetheless, in view of its spectral type (Bpe), it is worth making
observations of HDE 245770 until defeated by the sun."


3C 249.1
     Lola J. Eachus and W. Liller, Center for Astrophysics, Harvard
College Observatory and Smithsonian Astrophysical Observatory,
report that the QSO 3C 249.1, which has a redshift z = 0.311, was at
magnitude B ~ 14.5 during March and April 1975.  This object can be
fainter than B = 16.4, according to plates in the Harvard collection,
and since 1930 it has averaged B ~ 16.0.


1975 May 23                    (2784)              Brian G. Marsden

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