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IAUC 7411: CI Aql = Prob. N IN Aql; C/2000 G2

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                                                  Circular No. 7411
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)


CI AQUILAE = PROBABLE NOVA IN AQUILA
     H. Yamaoka, Kyushu University, reports an accurate position
for the object reported on IAUC 7409, measured from a V-band CCD
image taken with Bisei Astronomical Observatory 1.01-m telescope by
K. Ayani and K. Shirakami: R.A. = 18h52m03s.55, Decl. = -1 28'38".9
(equinox 2000.0; uncertainty about 0".2).  This position is nearly
identical to that of CI Aql.
     W. Liller, Vina del Mar, Chile, reports that a prediscovery
hypersensitized Technical Pan film, taken on Apr. 28.260 UT with an
85-mm f/2.0 camera lens and orange filter, clearly shows CI Aql at
mag 9.8.  He adds:  "CCD spectroscopy with an objective prism shows
H-alpha with an intensity 4.3 times that of the neighboring
continuum.  The [O I] lines at 630 and 636 nm are also strong, and
there is evidence of He II at 587 nm.  H-beta is present but weak,
probably owing to interstellar reddening.  There is no evidence
(yet) of Fe II lines.  CCD imaging with a 0.20-m Schmidt camera and
a broadband-V filter (that includes the strong H-alpha emission)
yields the following magnitudes:  Apr. 30.360, 8.87; 30.398, 8.95."
     CCD photometry of CI Aql by D. Hanzl, Brno, Czech Republic,
with a 0.40-m reflector:  May 1.044 UT, V = 8.83 +/- 0.03, B-V =
+0.67 +/- 0.03, V-I = +1.68 +/- 0.05 (Hipparcos comparison star HIP
92546).  Visual magnitude estimates:  Apr. 30.063 UT, 9.4 (M.
Reszelski, Szamotuly, Poland); 30.980, 9.1 (K. Hornoch, Lelekovice,
Czech Republic); May 1.083, 8.9 (M. Lehky, Hradec Kralove, Czech
Republic).


COMET C/2000 G2 (LINEAR)
     Another object with unusual motion that was reported as
asteroidal by LINEAR (discovery observation given below) has been
noted by other observers, following posting on the NEO Confirmation
Page, as being cometary in appearance.  G. Hug, Eskridge, KS,
reported a diffuse appearance on several CCD images taken with a
0.3-m reflector during Apr. 21-29, and Klet CCD observations by J.
Ticha, M. Tichy, and Z. Moravec (0.57-m reflector) indicated a coma
diameter of about 6" on Apr. 22.9 UT.  A 300-s R exposure taken by
C. Hergenrother with the Steward Observatory 2.3-m telescope on
Apr. 30 confirms that this object has a 6" coma and a 20" tail in
p.a. 117 deg.  Full astrometry and orbital elements (T = 2000 Feb.
6.1 TT, q = 2.72 AU, i = 170.5 deg, P = 53.6 yr) appear on MPEC
2000-J02.

     2000 UT             R.A. (2000) Decl.        m2
     Apr.  4.38585   14 36 04.21   - 1 57 13.1   18.4

                      (C) Copyright 2000 CBAT
2000 May 1                     (7411)            Daniel W. E. Green

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