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IAUC 5241: Var OBJECT IN Oph; 1986 III; N Cen 1991

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IAUC number 

                                                  Circular No. 5241
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 or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


VARIABLE OBJECT IN OPHIUCHUS
     R. H. McNaught, Anglo-Australian Observatory, reports the
following position from an exposure on Apr. 15.6 UT with the Uppsala
Southern Schmidt:  R.A. = 17h17m14s.02, Decl. = -26 43'27".1 (equinox
1950.0).  This represents an empty field on the SERC J, I, and
R, ESO B and R, and Palomar B and R surveys, implying a minimum
photographic magnitude fainter than 21 and ruling out a Mira variable,
which would be prominent on the I survey.  The nearest stars on the
SERC J survey (1976 May 29) are star A (R.A. = 17h17m13s.80, Decl. =
-26 43'33".7; mag 17); star B (end figures 13s.53, 31".2; mag 18);
star C (13s.45, 30".0; mag 17.5); star D (14s.65, 22".4; mag 20).
No nearby star shows evidence of high proper motion, and field stars
measured on the Uppsala and SERC films agree to within 0".7 .
     With regard to this information, R. M. Wagner notes that when
the observations that were discussed on IAUC 5238 and 5240 were
made, an early approximate position provided by Camilleri was used;
an accurate position was not yet available.  The M2 star that was
observed now appears to be some 2' away from this new cataclysmic
variable.


PERIODIC COMET HALLEY (1986 III)
     K. Meech, Institute for Astronomy, University of Hawaii, reports:
"Observations of P/Halley obtained on Apr. 12 UT with the UH
2.2-m telescope and the new TEK 1024 CCD system show that the comet
has faded considerably.  The Mould R magnitude within an aperture of
radius 5", centered on the central condensation, is now about 21.5.
Coma is visible out to a projected distance of at least 180 000 km.
Although the coma shape still appears approximately hemispherical,
oriented towards the southeast, the southwest quadrant has faded
considerably, creating a wedge-shaped appearance, brightest toward
p.a. 90 deg."


NOVA CENTAURI 1991
     Visual magnitude estimates: Apr. 3.81 UT, 10.5 (R. H. McNaught,
Siding Spring Observatory); 4.49, 10.6 (McNaught); 5.60, 10.9
(McNaught); 5.79, 11.0 (McNaught); 10.61, 11.4 (McNaught); 15.37,
11.3 (A. Jones, Nelson, N.Z.); 15.51, 11.8 (P. Williams, Heathcote,
N.S.W.).


1991 April 17                  (5241)             Daniel W. E. Green

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