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Alert Notice 276: 1903-57 Supernova 2000cj in NGC 6753 in Pavo AND 1846-01D Probable nova in Aquila = 1846-01 CI Aquilae

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
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AAVSO ALERT NOTICE 276 (May 18, 2000)

1903-57  SUPERNOVA 2000cj IN NGC 6753 IN PAVO

We have been informed by the Central Bureau for Astronomical Telegrams (IAU
Circular 7425
) that Robert O. Evans, Hazelbrook, New South Wales, Australia,
visually discovered an apparent supernova in NGC 6753 on May 14.7 UT at
magnitude approximately 14.8 using a 0.31-m reflector.  The object was
confirmed by E. Dobosz, Bankstown, NSW, who obtained a CCD image on May 15.6
UT (in bright moonlight) using a 0.28-m Schmidt-Cassegrain telescope.  The
image accompanies this alert notice.

Dobosz's image was measured by G. L. White, Nepean Centre for Astronomy,
Kingswood, NSW, who reported the position of the supernova, which is located
about 35" east and 19" south of the nucleus of the galaxy, as:

     R.A. = 19h 11m 27.49s   Decl. = -57 degrees 03' 14.1" (equinox 2000.0)

R. McNaught, Siding Spring Observatory, NSW, measured a CCD image, obtained by
R. Langersek, Macgregor, Queensland, Australia, on May 15.62 UT using a 0.25-m
Schmidt-Cassegrain telescope and showing the object at CCD magnitude 14.7.
He reported position end figures for the supernova of 27.68s and 19.4", and an
offset from the galaxy center of 33" east and 22" south.  McNaught also
reported that nothing appears on the ESO B, ESO R, and SERC J surveys at the
position he measured for the object (IAU Circular 7425).

Additional observations of SN 2000cj reported include (IAU Circular 7425):
May 17.1 UT, 14.56 V, L. Strolger, Cerro Tololo Interamerican Observatory
(CTIO) (via N. Suntzeff, CTIO); 14.79, 14.8:, P. Marples, Loganholme,
Queensland, Australia; 15.7, 14.7, R. Evans, Hazelbrook, NSW, Australia..

Also accompanying is an AAVSO 'f' scale Preliminary chart of NGC 6753, prepared
by C. Scovil, showing SN 2000cj and V-adapted magnitudes from the USNO-A2.0
catalogue.  Please use this chart to observe 0903-57 SN 2000CJ and report your
observations to AAVSO Headquarters.  Please be sure to indicate which
comparison stars you used to make your observations.

Congratulations to Bob on his latest discovery!

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

Chart links are obsolete; 11/2013 create charts using VSP at http://www.aavso.org/vsp

Electronic copies of the image and chart of SN 2000cj 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/alert276

**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

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