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IAUC 3714: (1009); ABELL 41; NOTICE RE Tlgms

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IAUC number 

                                                  Circular No. 3714
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 617-864-5758


(1009) SIRENE
     J. Gibson reports that he has recovered this object on exposures
with the 1.2-m Schmidt telescope at Palomar as follows:

     1982 UT             R. A. (1950) Decl.        Mag.
     July 14.30702    18 25 40.20   - 4 28 32.6   19.5-20
          15.28896    18 24 42.86   - 4 28 10.2

The indicated correction to the prediction by L. K. Kristensen on
IAUC 3691 is Delta-T = +1.60 days.  A revised ephemeris follows:

     1982 ET     R. A. (1950) Decl.     Delta     r      B
     July 20    18 20.26    - 4 28.1
          30    18 11.81    - 4 37.5    2.042   2.914   19.5
     Aug.  9    18 05.29    - 4 57.9
          19    18 01.13    - 5 26.9    2.145   2.828   19.6
          29    17 59.56    - 6 01.6
    Sept.  8    18 00.60    - 6 39.1    2.300   2.738   19.8
          18    18 04.14    - 7 17.0
          28    18 10.02    - 7 53.1    2.472   2.644   19.9


ABELL 41
     A. D. Grauer, University of Arkansas at Little Rock, and H. E.
Bond, Louisiana State University, report that the 15th-mag nucleus
of the planetary nebula Abell 41 (R. A. 17h26m10s, Decl. -15o10'.8, equinox
1950.0) is an ultra-short-period binary system.  The blue light
curve, obtained with the 0.9-m reflectors at Kitt Peak, Cerro Tololo
and L.S.U., exhibits broad, 0.15-mag-deep minima that recur with a
period of 2h43m.  No eclipses are seen; the low-amplitude variation
is probably due to the heated hemisphere of a cool companion.  Times
of minimum are given by HJD = 2445082.9463 + 0.1132269 E.


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1982 July 22                   (3714)              Brian G. Marsden

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