NOVA IN AQUILA

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
E-mail: aavso@aavso.org
Tel. 617-354-0484
FAX 617-354-0665

AAVSO ALERT NOTICE 276 (May 18, 2000)

1846-01D PROBABLE NOVA IN AQUILA = 1846-01 CI AQUILAE

The probable nova announced in AAVSO Alert Notice 274 as possibly being CI Aql does in fact appear to be CI Aql undergoing a second outburst. CI Aql was discovered as a possible nova in 1917, with a single observation of photographic magnitude 11 reported. No additional rebrightenings of CI Aql had been observed.

David B. Williams, Whitestown, IN, examined the Harvard College Observatory photographic plates of this field from 1917, and determined that CI Aql reached a maximum photographic magnitude of 8.6, using Tycho B magnitudes for nearby comparison stars (article submitted to IBVS 17 May 2000). The similarity in maximum magnitude between the two outbursts and the very close overlap in position would support the current outburst's being a second outburst of CI Aql, thus making CI Aql a recurrent nova.

Please continue to monitor this star as it fades using the chart issued with AAVSO Alert Notice 274, and report your observations to AAVSO Headquarters as 1846-01 CI AQL.

CHARTS AVAILABLE ON AAVSO WEB AND FTP SITES

Electronic copies of the chart of CI Aql mentioned in this Alert Notice are available through our web site at the following address:

http://www.aavso.org

They may also be obtained directly from our FTP site:

             ftp.aavso.org (198.116.78.2), in /alerts/alert274

**Please note that the IP number of our FTP site has changed.**

The answering machine at AAVSO Headquarters is on nights and weekends for your convenience. Please call our charge-free number (888-802-STAR = 888-802-7827) to report your observations. We also encourage observers to send observations by fax to 617-354-0665 or by e-mail through the Internet to observations@aavso.org.

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Janet A. Mattei
Director

Elizabeth O. Waagen
Senior Technical Assistant

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
E-mail: aavso@aavso.org
Tel. 617-354-0484
FAX 617-354-0665

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, http://cfa-www.harvard.edu/iau/Headlines.html) 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 estimate.

Congratulations to Akihiko Tago on his discovery!

CHARTS AVAILABLE ON AAVSO WEB AND FTP SITES

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:

http://www.aavso.org

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

          ftp.aavso.org (198.116.78.5), in /alerts/alert261)

The answering machine at AAVSO Headquarters is on nights and weekends for your convenience. Please call our charge-free number (888-802-STAR = 888-802-7827) to report your observations. We also encourage observers to send observations by fax to 617-354-0665 or by e-mail through the Internet to observations@aavso.org. If you need to change the email address this Alert Notice is sent to, or if you would like to subscribe to or stop receiving the Alert Notice by email, please visit the following URL:

http://www.aavso.org/mailinglists.stm

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Janet A. Mattei
Director

Elizabeth O. Waagen
Senior Technical Assistant

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