IAUC 7171: S/1986 U 10; C/1999 J2; V1333 Aql

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                                                  Circular No. 7171Central Bureau for Astronomical TelegramsINTERNATIONAL ASTRONOMICAL UNIONMailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304Phone 617-495-7244/7440/7444 (for emergency use only)S/1986 U 10     E. Karkoschka, Lunar and Planetary Laboratory, University ofArizona, reports the discovery of a previously unknown satellite ofUranus in seven Voyager 2 images, at a signal that is between 3 and15 times the background noise.  Observed over the 5-day arc1986 Jan. 18-23, S/1986 U 10 was at apparent mag about 6.5-9.5(brightening as the spacecraft approached Uranus), corresponding toa mean opposition magnitude of V about 23.6 and diameter roughly 40km (assuming an albedo similar to that of nearby satellites).  Withorbital motion 564.25 +/- 0.10 deg/day, an assumed circular orbitin the plane of Uranus' equator yields an orbital radius of 76 416km.  Conjunction in orbital longitude between S/1986 U 10 andUranus XIV (Belinda) occurred on 1986 Jan. 24.7 UT.COMET C/1999 J2 (SKIFF)     Additional astrometry and the following very preliminaryparabolic orbital elements appear onMPEC 1999-K08:     T = 1999 Oct. 23.960 TT          Peri. = 114.701                                      Node  =  47.826   2000.0     q = 7.48613 AU                   Incl. =  86.9401999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1May  12    17 00.39   +63 43.4   7.390   7.558   95.7    7.6   15.1     22    16 46.52   +63 34.8   7.384   7.549   95.5    7.7   15.1June  1    16 32.51   +63 08.2   7.387   7.541   94.9    7.7   15.1     11    16 19.08   +62 23.3   7.398   7.534   93.8    7.7   15.1     21    16 06.89   +61 21.3   7.416   7.527   92.4    7.8   15.1V1333 AQUILAE     C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-Provence (OHP), write:  "CCD images of V1333 Aql = Aquila X-1 takenwith the 1.2-m OHP telescope on May 13.1, 14.1, and 15.1 UT show arapid increase in mean brightness over this time interval, from V =17.9 to 17.2.  These levels are comparable to the maximum valuesthat we observed during the mid-1996 mini-outburst and the mid-1997moderate outburst.  However, quick-look data from the XTE All-SkyMonitor for May 14-17 show low count rates (< 70 milliCrab).  Thislow x-ray-to-optical luminosity ratio may perhaps signal a repeatof the 1996 mini-outburst."                      (C) Copyright 1999 CBAT1999 May 18                    (7171)            Daniel W. E. Green

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