Central Bureau for Astronomical Telegrams
IAUC 3510: 1980l; 4U 0115+634
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Read IAUC 3511
Circular No. 3510
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
COMET RUSSELL (1980l)
Kenneth S. Russell, U. K. Schmidt Telescope Unit, reports
discovery of a comet as follows:
1980 UT R. A. (1950) Decl. Mag.
Sept. 6.71181 3 13 36.5 -35 04 41 ~17
6.75694 3 13 33.7 -35 06 23
7.58027 3 12 49.4 -35 36 59
7.59416 3 12 48.5 -35 37 30
The object appears as a fuzzy trail with signs of a tail.
Parabolic orbital elements, by the undersigned, which satisfy
the above positions to within 0".7, were used for the ephemeris:
1981 ET R. A. (1950) Decl. Delta r Mag.
Sept. 8 3 12.41 -35 52.2
12 3 08.16 -38 02.3 0.585 1.383 17.4
16 3 03.19 -39 48.4
20 2 57.63 -41 13.5 0.680 1.478 18.1
4U 0115+634
J. Middleditch, Lawrence Berkeley Laboratory, University of
California; and A. Koski and M. Burbidge, University of California
at San Diego, write: "Photometric and spectroscopic observations of
the optical candidate for the x-ray binary pulsar 4U 0115+634 (cf.
IAUC 3171) taken on Aug. 11 and 13 with the 0.9-m Crossley and 3.08-m
Shane telescopes at Lick Observatory show this star to be in an
unusually faint state with mv ~ 16.3. A preliminary comparison of
the spectrum with the earlier spectrum (ibid.) reveals no particularly
strong change in color (B-V ~ +1.5 now). Analyses of the time
series taken on both nights in 1980 show no modulation > 0.4 percent
of the broadband light from this star was found with periods near
3.61 s. Previous photometric observations of this source in its
brtghter state made on 1978 Oct. 11 at Lick and on 1979 July 25 at
Kitt Peak National Observatory also show no modulation > 0.25 percent
was found with periods near 3.61 s (i.e., above 0.5 percent of
its current light level). Observers with data on this source between
1979 July and 1980 Aug. are urged to communicate with Koski
(telephone 714-452-2664) or Middleditch (505-667-3904, FTS 843-3904).
Further observations of this star are needed."
1980 September 8 (3510) Daniel W. E. Green
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