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Alert Notice 261: 1903+12 Nova Aquilae 1999 [V1493 Aql]

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AAVSO ALERT NOTICE 261 (July 15, 1999)

1903+12  NOVA AQUILAE 1999

We have been informed by the Central Bureau for Astronomical Telegrams
(IAU Circular 7223, of
the  photographic discovery of a nova in Aquila by Akihiko Tago, Tsuyama,
Japan, on July 13.558 UT at magnitude 8.8, using a 55-mm f/3 lens and
T-max 400 film (unfiltered).  A second exposure taken July 13.560 also
showed the nova.  An additional photograph taken by him on July 14.5
showed the nova at approximately magnitude 8.9.  Tago reports that
films taken by him on July 5 and July 9 show nothing at the position of
the nova down to magnitude 11 and 10.5, respectively.

CCD confirmation of the nova was obtained by Akimasa Nakamura, Kuma Kogen
Astronomical Observatory, Ehime, Japan, who reported that it was visible
on two CCD frames taken on by him on July 14.513 UT with a 60cm f/5.8
Ritchey-Chretien telescope.  A precise position of the nova was also given
by Nakamura as:

      R.A. = 19h 07m 36.90s Decl. = +12 degrees 31' 26.2" (2000)

Spectroscopic confirmation was reported by K. Ayani and T. Kawabata, Bisei
Astronomical Observatory, Okayama, Japan, who used the BAO 1.01-m telescope
to obtain a low-resolution spectrogram showing strong broad H-alpha and
H-beta lines.

Additional observations reported to the AAVSO include: July 14.8931 UT, 9.9,
J. Fernandez Andujar, Seville, Spain; 14.922, 9.7, H. McGee, West Clandon,
Surrey, England (GSC/vsnet sequence); 14.923, 10.1, T. Kinnunen, Espoo,
Finland (Tycho sequence); 14.948, 10.0, Kinnunen; 14.958, 10.2, McGee;
15.001, 10.4, McGee; 15.059, 10.4, McGee; 15.0868, 10.5:, G. Chaple,
Townsend, MA; 15.1390, 10.2, J. Luengo, Audobon, PA (Tycho sequence); 15.1486,
10.6, J. Bortle, Stormville, NY (Tycho sequence); 15.225, 10.33 CCDV, R.
Zissell, S. Hadley, MA (Tycho sequence); 15.250, 10.3, S. O'Connor, Montreal
North, Quebec, Canada.

Accompanying are a "c" scale AAVSO preliminary chart of N Aql 99 prepared by
C. Scovil, and a CCD(V) image of the nova field taken by R. Zissell, Mt.
Holyoke College, S. Hadley, MA, and having a sequence calibrated by Zissell
from the Tycho magnitude 8.400 star north of the nova.  Please use this chart
and these sequences to observe 1903+12 N Aql 99 and report your observations
to AAVSO Headquarters, indicating which comparison stars you used to make your

Congratulations to Akihiko Tago on his discovery!


Chart links are obsolete; 11/2013 create charts using VSP at

Electronic copies of the N Aql 99 chart and the CCD(V) image with sequence
mentioned in this Alert Notice are available through our web site at the
following address:


The chart may also be obtained directly from our FTP site:

 (, in /alerts/alert261)

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Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Janet A. Mattei

Elizabeth O. Waagen
Senior Technical Assistant


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