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IAUC 7180: C/1999 K6; V1333 Aql

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                                                  Circular No. 7180
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 K6 (LINEAR)
     Another apparently asteroidal object discovered by LINEAR
(discovery observation below; additional astrometry on MPEC 1999-
K35), and posted on The NEO Confirmation Page, has been reported as
cometary on May 24 by L. Sarounova (Ondrejov; faint coma with
condensed nucleus) and by M. Tichy and Z. Moravec (Klet; diffuse
with coma diameter >/= 10").

     1999 UT             R.A. (2000) Decl.        m2
     May  20.22732   19 01 39.50   + 9 26 33.8   17.6

Preliminary parabolic orbital elements by B. G. Marsden:

     T = 1999 July 24.130 TT          Peri. =  56.518
                                      Node  = 245.426   2000.0
     q = 2.25099 AU                   Incl. =  46.403

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
May  22    19 01.68   +10 23.8   1.639   2.364  124.5   20.7   15.8
June  1    19 00.34   +15 48.7   1.567   2.332  127.9   20.1   15.7
     11    18 56.47   +21 04.8   1.522   2.304  129.4   19.9   15.5
     21    18 50.39   +25 54.0   1.502   2.283  129.0   20.2   15.5


V1333 AQUILAE
     C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-
Provence; and P. Leisy and F. Patat, European Southern Observatory
(ESO), report:  "We have taken V-band and Cousins I-band CCD frames
of V1333 Aql (= Aquila X-1) with the ESO 3.6-m telescope (+
EFOSC-2) in quiescence (Apr. 9) and near maximum brightness during
the current outburst (May 21).  The seeing (in I) was 0".8 and 1".1
in April and May, respectively, with a projected pixel size of
0".16.  The barycenter of the image, corresponding to the variable
object, shifts by 0".42 +/- 0".03 to the west during activity.  A
similar effect is also seen in data taken with the Haute-Provence
1.2-m telescope for the long-term monitoring program (pixel size
0".69 and seeing 1".6).  This shows that the true optical
counterpart of Aql X-1 is the interloper reported on IAUC 7086 to
be located 0".46 to the west of the main object.  This object has V
= 21.6 and V-I_c = +2.2 (Chevalier et al. 1999, A.Ap., submitted).
Combined analysis of this photometry and of low-resolution spectra
taken previously with the same telescope suggest a late-K spectral
type reddened by E(B-V) = 0.5 mag."

                      (C) Copyright 1999 CBAT
1999 May 25                    (7180)            Daniel W. E. Green

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