January 28, 2006
SUBJECT: Possible New Nova/Dwarf Nova in Hya
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 25m 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  [obsolete link; create charts using VSP at http://www.aavso.org/vsp  ]
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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This Alert Notice was prepared by: Aaron Price.
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