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IAUC 7632: 1999 KW4; N Aql 2001

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                                                  Circular No. 7632
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)
CBAT@CFA.HARVARD.EDU (science)
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Phone 617-495-7440/7244/7444 (for emergency use only)


1999 KW4
     L. A. M. Benner, S. J. Ostro, J. D. Giorgini and R. F. Jurgens,
Jet Propulsion Laboratory; J. L. Margot, California Institute of
Technology; and M. C. Nolan, Arecibo Observatory, write:
"Goldstone (8560-MHz, 3.5-cm) delay-Doppler radar images on
May 21-23 reveal that 1999 KW4 is a binary system.  The images show
separations up to at least 2 km between the components, whose sizes
differ by a factor of at least three.  Additional radar observations
are planned at Goldstone and Arecibo.  Follow-up optical observations
are desirable."

     The following ephemeris is from the orbital elements on MPEC 2001-K23
(2 km at the object's distance corresponding to 0".06-0".09):

2001 TT       R. A. (2000) Decl.     Delta      r    Elong. Phase     V
May  24.0    20 46.52    -18 28.3    0.040    1.029  113.8   64.1    11.9
     24.5    20 18.18    -15 19.5    0.037    1.032  120.0   58.2    11.6
     25.0    19 46.27    -11 23.8    0.034    1.034  126.8   51.7    11.3
     25.5    19 11.52    - 6 45.0    0.033    1.036  133.8   44.9    11.0
     26.0    18 35.28    - 1 39.0    0.032    1.038  139.9   38.9    10.8
     26.5    17 59.30    + 3 28.4    0.033    1.040  144.2   34.7    10.7
     27.0    17 25.27    + 8 11.4    0.035    1.042  145.9   33.0    10.8
     27.5    16 54.36    +12 13.6    0.037    1.044  145.2   33.6    10.9
     28.0    16 27.12    +15 30.5    0.040    1.046  143.0   35.7    11.2
     28.5    16 03.59    +18 05.9    0.044    1.048  140.1   38.3    11.5
     29.0    15 43.45    +20 06.7    0.048    1.049  137.2   41.1    11.7


NOVA AQUILAE 2001
     CCD magnitude estimate by J. D. West, Mulvane, KS: May 19.18 UT,
V = 12.94 +/- 0.05.

     K. Hornoch, D. Hanzl and M. Lehky, Brno, Czech Republic, provide the
following CCD photometry on May 20.04 UT: V = 13.27, R = 11.5, I = 10.47
(comparison star HIP 93914: V = 8.73, B-V = +0.339 +/- 0.024, V-I = +0.40
+/- 0.03).  During May 20.029-20.086 the nova was constant in R to within
+/- 0.01 mag.

     Visual magnitude estimates provided by J. Mattei, American Association of
Variable Star Observers: May 20.98 UT, 13.7 (P. Dubovsky, Podbiel, Slovakia);
21.35, 13.8 (P. Abbott, Leduc, AB, Canada).

     Corrigendum.  On 7628, line 1, for  Instituto de Astrofisica de
Canarias  read  Isaac Newton Group, La Palma

                      (C) Copyright 2001 CBAT
2001 May 23                    (7632)              Brian G. Marsden

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