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IAUC 7228: 1999df; NO 1999db; V1493 Aql = N Aql 1999

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                                                  Circular No. 7228
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)


SUPERNOVA 1999df IN CGCG 274-026
     T. Puckett and I. Siegert, Mountain Town, GA, report the
discovery of an apparent supernova (mag 18.2) on an unfiltered CCD
frame (limiting mag 20.0) taken with a 0.60-m automated supernova
patrol telescope on July 20.16 UT.  SN 1999df is located at R.A. =
15h08m56s.52, Decl. = +52o26'53".1 (equinox 2000.0), which is 5".9
north of CGCG 274-026.  The new object was also present on an
unfiltered CCD frame taken on July 21.09, but it was not present on
an unfiltered CCD frame taken on June 8.17 (limiting mag about
20.5), nor does it appear on a second-generation Palomar Sky survey
image (limiting mag 20.7) taken on 1991 April 19.  An image from
Puckett can be accessed at http://www.cometwatch.com/sn_pgc_54081.jpg.


NO SUPERNOVA 1999db
     T. Matheson, M. Modjaz, and A. V. Filippenko, University of
California at Berkeley, write:  "A CCD spectrum (range 420-700 nm)
obtained on July 18 with the Shane 3-m reflector at Lick
Observatory shows that SN 1999db (cf. IAUC 7227) is probably a
quasi-stellar object with redshift 1.9.  Prominent emission at 450
nm is identified with C IV 155-nm, and a much weaker line near 550
nm could be C III] 191-nm.  In any case, the spectrum does not
resemble those of known supernovae."


V1493 AQUILAE = NOVA AQUILAE 1999
     N. James, Chelmsford, England, reports a precise CCD position
for this nova using a 0.3-m reflector on July 14.919 UT:  R.A. =
19h07m36s.91, Decl. = +12o31'26".7 (equinox 2000.0; eleven GSC
stars, rms residuals 0".22 in R.A., 0".23 in Decl.).  G. Masi,
Ceccano, Italy, reports the following position end figures for the
nova, measured from six USNO A2.0 reference stars:  36s.89, 26".5
(mean residuals 0".04 in R.A., 0".10 in Decl.).
     CCD magnitudes (Czech data based on comparison star GSC
1048.863, with assumed V = 8.40 +/- 0.02, B-V = +0.31 +/- 0.02 from
Tycho Catalogue):  July 14.955 UT, V = 10.16 +/- 0.01 (M. Zejda,
Brno, Czech Rep.); 15.820, V = 10.59 +/- 0.01, B-V = +0.40 +/- 0.02
(J. Safar, Brno, Czech Rep.); 16.911, R = 8.55 (G. Masi, Ceccano,
Italy); July 15.967, V = 10.64 +/- 0.02 (P. Hajek, Vyskov, Czech
Republic); 17.020, V = 11.10 +/- 0.02 (Hajek); 17.035, V = 11.02
+/- 0.03 (D. Hanzl, Brno, Czech Rep.); 17.999, V = 11.27 +/- 0.02,
B-V = +0.24 +/- 0.03 (Safar); 18.000, V = 11.20 +/- 0.03 (Hajek);
18.890, V = 11.42 +/- 0.01, B-V = +0.39 +/- 0.04 (Zejda).

                      (C) Copyright 1999 CBAT
1999 July 21                   (7228)            Daniel W. E. Green

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