Central Bureau for Astronomical Telegrams
IAUC 3935: AN UMa; TWO Vars IN THE Ori NEBULA; 1983n
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Circular No. 3935
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
AN URSAE MAJORIS
J. P. Osborne, EXOSAT Observatory, reports that on Mar. 31.4
UT this AM-Her object was fortuitously seen by the low-energy telescope
during an observation of a nearby object. An uneven, double-
peaked lightcurve is clearly visible. AN UMa has been observed to
have three different optical states (Liebert et al. 1982, Ap.J.
254, 232), with a factor 40 difference in the soft x-ray flux
between the bright and intermediate states. The count rate seen by
EXOSAT strongly suggests that the object has now returned to its
bright state (mag 14.0-14.5), which has not been observed since
1977 Jan. Spectroscopic and photometric observations are urged.
TWO VARIABLES IN THE ORION NEBULA
With reference to the item on IAUC 3924, G. M. Hurst,
Wellingborough, England, writes that a further exposure by R. Chanal,
St. Etienne, France, on Mar. 5.84 UT shows the object NSV 2229
(presumably) at mpv ~ 14.5. Hurst has found the object on ten
more plates back to 1920, but it was not recorded down to the
limit of mag ~ 15.5 on eight further plates he examined. Close
examination of the three 1978 photographs indicates that secondary
star images are present on each occasion and that Scott's object
was therefore almost certainly a spurious image of V372 Ori.
PERIODIC COMET CROMMELIN (1983n)
Ephemeris continuation with adjustment indicated on IAUC 3930:
1984 ET R.A. (1950.0) Decl. p r m2
Apr. 10 6 10.06 -18 27.6 0.850 1.167 17.7
15 6 39.71 -19 03.3
20 7 07.60 -19 22.6 0.936 1.299 17.9
25 7 33.57 -19 29.2
30 7 57.61 -19 26.6 1.054 1.432 18.2
May 5 8 19.78 -19 18.2
10 8 40.20 -19 06.5 1.200 1.565 18.6
15 8 59.02 -18 53.5
20 9 16.41 -18 40.7 1.367 1.696 18.9
25 9 32.53 -18 29.0
30 9 47.54 -18 19.1 1.552 1.826 19.3
June 4 10 01.58 -18 11.4
9 10 14.76 -18 06.4 1.751 1.954 19.6
1984 April 2 (3935) Brian G. Marsden
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