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IAUC 5891: 1993s; RX J2107.9-0518; N Sgr 1993

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                                                  Circular No. 5891
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)


COMET MUELLER (1993s)
     Jean Mueller reports her discovery of a comet on a plate taken
with the 1.2-m Oschin Schmidt Telescope in the course of the second
Palomar Sky Survey.  The object is diffuse, of mag 17.5-18, with a
pronounced tail about 80" long toward p.a. 270o.  Confirmation was
obtained via a second plate taken by J. D. Mendenhall and Mueller.
The following positions are measurements by Mueller of the centers
of the short, diffuse trails:

     1993 UT             R.A. (2000) Decl.
     Nov. 20.41910    6 58 55.65   +20 35 20.0
          21.36111    6 58 42.36   +20 37 31.9


RX J2107.9-0518
     N. M. Shakhovskoj, Crimean Astrophysical Observatory; and S. V.
Kolesnikov, Odessa University, report the detection of circular
polarization of the eclipsing polar RX J2107.9-0518.  The observation
was made with the 2.6-m Shajn telescope, using a single-channel
polarimeter with a fast-rotating half-wave plate in the broad R band
(500-750 nm) and for a 4-s integration time.  The circular polarization
reached its maximum positive value of 3.08 +/- 0.85 percent
on Aug. 15.955 UT (phase 0.29) and its maximum negative value of
-8.80 +/- 1.10 percent on Aug. 16.002 (phase 0.83).  These data are
the means from a series of 64 integrations.  Simultaneous UBVRI
photometry with the 1.25-m telescope gave the following mean
brightness and colors outside eclipse:  V = 15.0, U-B = -0.85, B-V
= +0.25, V-R = +0.35, R-I = +0.30.  The times of the eclipses were
very close to the ephemeris by Schwope et al. (1993, A.Ap. 271,
L25-L28).


NOVA SAGITTARII 1993
     A. C. Gilmore, Mount John University Observatory, reports the
following photometry made with Johnson-Cousins UBVRcIc filters; the
measures were made differentially from SAO 186445 (assumed V =
7.747, U-B = -0.080, B-V = +0.079, V-Rc = +0.055, V-Ic = +0.16 on
Sept. 17.4 UT and located 10'.7 west and 5'.2 south of N Sgr 1993):
Oct. 24.43, V = 11.57 +/- 0.02, U-B = -0.43 +/- 0.01, B-V = +0.06
+/- 0.04, V-Rc = +1.31 +/- 0.01, V-Ic = +1.4 +/- 0.3; 25.42, 11.67
+/- 0.01, -0.45 +/- 0.04, +0.16 +/- 0.01, +1.35 +/- 0.02, +1.1 +/-
0.1; 28.40, 11.94 +/- 0.03, -0.55 +/- 0.05, +0.16 +/- 0.02, +1.56
+/- 0.01, -.  Conditions were marginal on Oct. 25.


1993 November 21               (5891)            Daniel W. E. Green

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