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IAUC 3846: 1983l; IR OBJECT NEAR XB 1812-12; H0139-68

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IAUC number 

                                                  Circular No. 3846
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 CERNIS (1983l)
     M. P. Candy, Perth Observatory, Bickley, cables the following
observation by J. Johnston and himself:

     1983 UT             R.A.    (1950.0)     Decl.        m1

     July 22.89236       2 42 42.79      +10 58 12.4       12

     The following parabolic elements, derived by the undersigned
from the seven observations, are necessarily rather uncertain:

           T = 1983 Aug. 31.95 ET  Peri. = 196.32
                                   Node  = 208.81   1950.0
           q =   3.2376 AU         Incl. = 136.19

     1983 ET     R.A. (1950.0) Decl.      p        r       m1

     July 25     2 42.44    +10 31.9    3.284    3.258    10.7
     Aug.  4     2 39.86    + 8 11.0
          14     2 34.84    + 5 19.7    2.877    3.242    10.4
          24     2 26.91    + 1 53.6
     Sept. 3     2 15.67    - 2 09.2    2.528    3.238    10.1


INFRARED OBJECT NEAR XB 1812-12
     K. Kodaira, Mauna Kea Observatory, reports detection of an
infrared object of K = 7.0 (J-K = +2.6, H-K = +0.8, K-L = +0.6) at
R.A. = 18h12m19s, Decl. = -12deg04'2 (equinox 1950.0), close to the
center of the Hakucho and Uhuru error boxes for the x-ray burster XB
1812-12.  The object, which is a few seconds of arc across, is
thought to be the core of a heavily reddened globular cluster in
the galactic bulge containing the x-ray burster.


H0139-68
     J. W. Menzies, South African Astronomical Observatory, telexes
that this AM-Her-type star (cf. IAUC 3833) has entered a low
state, with mean brightness V ~ 17.3 and peak-to-peak amplitude ~
0.6 mag on July 15.  Low-dispersion reticon spectra with the 1.9-m
reflector show Balmer lines in emission with weak or absent He I
and occasionally very weak He II 469-nm.  There are broad absorption
features blueward of the Balmer lines similar to those seen
in AM Her in its low state.  Further observations with larger
apertures would be worthwhile.


1983 July 26                   (3846)              Brian G. Marsden

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