SUBJECT: Possible New Nova/Dwarf Nova in Hya
Date 29/1/2006 11:13:39 | Sujet : news en anglais
| THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
aavso@aavso.org
Tel. 617-354-0484 Fax 617-354-0665
AAVSO ALERT NOTICE #334 (January 28, 2006)
Grzegorz Pojmanski, Warsaw University Astronomical Observatory,
reports on a possible new nova or dwarf nova discovered by the
ASAS3V instrument. The previously unobserved object was first
detected by ASAS3V at RA = 10h 22m 22s DEC = -15d 42'.4
(assumed J2000) on Jan 26.245 UT at magnitude 12.219 in V.
ASAS-3 CCD V observations of the new object to date:
Jan. 23.260 <14
Jan. 26.245 12.219 Err: 0.047
Jan. 27.346 12.476 Err: 0.084
Jan. 27.349 12.492 Err: 0.076
Jan. 27.352 12.469 Err: 0.084
Jan. 28.095 12.576 Err: 0.043
The new object was confirmed by the following AAVSO observations:
Jan. 27.986 12.5 Err: Unknown CCD Unfiltered VMT
Jan. 28.1 12.5 Err: Unknown CCD V GRL
Jan. 28.372 12.7 Visual LMK
Jan. 28.534 12.891 Err: 0.008 CCD Unfiltered KTC
GRL Bjorn H. Granslo Norway
KTC Tom Krajci New Mexico, USA
LMK Mike Linnolt Hawaii, USA
VMT Tonny Vanmunster Belgium
Early CCD observations submitted by Tom Krajci show a hint of modulation
with a preliminary period of 0.067 +/- 0.001 days and an increasing rate of
decay. Please observe for as long as possible to look for superhumps or
other behavior. Use a V filter if possible and go unfiltered if that is the
only way for you to achieve 0.01 precision. Nice, long observing runs are needed.
Precision is more important than time resolution at this stage so stack if
needed.
Visual observations are also requested to fill in the gaps of CCD coverage.
An provisional AAVSO e-scale chart with photometry from ASAS-3 has been
created and is available at the following URL. A follow up chart with
BVRI photometry from Henden is in production and will be placed online
at the same URL when ready.
http://www.aavso.org/cgi-bin/searchcharts3.pl?name=ASAS102515
Also, an AAVSO light curve is available at this URL:
http://tinyurl.com/7vw3z
Pojmanski reports that one star is located close to this position
in the USNOB catalog:
# id| RA| DEC| B1| R1| B2| R2| I2|
0742-0227702 10:25:22.2433 -15:42:22.030 19.32 18.95 19.12 19.10 18.75
Report your observations to the AAVSO as: ASAS102515 or 1020-15.
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