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IAUC 5724: X Oph; 1992 WD5

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                                                  Circular No. 5724
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


X OPHIUCHI
     A. M. Le Squeren and S. Etoka, Observatoire de Paris, Meudon,
report: "In the course of an OH-maser-emission monitoring of Mira
stars with the Nancay Radio Telescope we have observed a strong flare
at 1665 MHz in the binary Mira star X Oph.  From 1985 to 1991 only
weak and fleeting 1667-MHz emission was present near -55.5 km/s (with
respect to the local standard of rest) with a flux of less than 0.7
Jy.  In early 1992 we suddenly observed increasing 1665-MHz polarized
emission centered at about -56.7 km/s.  The peak flux density we
recorded in May 1992 reached 6.8 and 1.8 Jy for right-handed and left-
handed circular polarization, respectively.  The velocity of this
flare emission is close to the -57.4 km/s of the H2O maser.  The peak
flux density has since decreased, but it is still at the level of 3.5
(right-handed) and 1.2 Jy (left-handed).  Optical, OH radio
interferometry and other maser-line observations would be useful in
order to understand the peculiar nature of this outburst.  A similar
phenomenon was observed by Le Squeren and Sivagnanam in R Leo in 1985
(IAUC 4164)."


1992 WD5
     Improved orbital elements from MPC 21977:

                    Epoch = 1993 Aug. 1.0 TT
     T = 1993 Feb. 13.8403 TT         Peri. = 122.1982
     e = 0.303944                     Node  =  10.1944  2000.0
     q = 1.248736 AU                  Incl. =   6.8747
       a =  1.794017 AU    n = 0.4101703    P =   2.403 years

1993 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Mar. 24     8 06.85    +28 34.3    0.506    1.289  114.1   44.9     15.8
Apr.  3     8 34.90    +24 26.7    0.559    1.312  111.5   45.2     16.1
     13     9 02.13    +20 23.4    0.621    1.339  108.9   45.1     16.3
     23     9 28.37    +16 28.2    0.690    1.370  106.2   44.8     16.6
May   3     9 53.70    +12 43.0    0.768    1.403  103.5   44.3     16.9
     13    10 18.13    + 9 08.8    0.854    1.439  100.7   43.6     17.1
     23    10 41.79    + 5 45.8    0.946    1.477   97.8   42.8     17.4
June  2    11 04.83    + 2 33.3    1.046    1.516   94.7   41.8     17.6
     12    11 27.34    - 0 29.1    1.152    1.556   91.6   40.7     17.9
     22    11 49.45    - 3 22.0    1.263    1.597   88.2   39.5     18.1


1993 March 25                  (5724)              Brian G. Marsden

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