Dear CBAers,Please take note of this guy. The light curve definitely suggests a superhump, but the sky position is so awkward that the period will be very tough to nail unless we can get round-the-world coverage. If you have a clear evening sky, see if you can squeeze out a short time-series (the longer the better, of course).
Borealites only, of course. By the way, on the other side of the night, it's AM CVn season again. I've written a short paper on the orbital period change in AM CVn; all it needs is one more seasonal timing in February 2008, and it's complete. That would be YOUR timing!
Happy observing! I'm sure I don't need to tell you, but there's a beautiful conjunction of Venus and Jupiter in the predawn sky this week. Gorgeous sight even from the Big Apple.
joe -------- Original Message -------- Subject: [cvnet-outburst] Optical transient OT_J021110.2+171624 is most likely a new UGSU-type dwarf nova Date: Thu, 31 Jan 2008 00:29:12 +0100 From: Tonny Vanmunster <Tonny.Vanmunster@xxxxxxxxxxxxxx> Reply-To: cvnet-outburst@xxxxxxxxxxxxxxx Organization: CBA To: <aavso-photometry@xxxxxxxxxxxxxx>, <cvnet-discussion@xxxxxxxxxxxxxxx>, "'CVnet outburst'" <cvnet-outburst@xxxxxxxxxxxxxxx> CC: Cba-Chat <cba-chat@xxxxxxxxxxx>, cba-news <cba-news@xxxxxxxxxxx> Dear colleagues, Earlier today, Patrick Wils announced (on cvnet-discussion) the detection by the Catalina Sky Survey of an optical transient (mag 14.3) on Jan 29th, that was suspected to be an outburst of USNO-B1.0 1072-0031053 (position RA = 02:11:10.19, Decl = +17:16:24.4, J2000.0), a star which is normally R=19.2. Patrick furthermore reported that object appeared bright on 2 out of 9 POSSII images. Following Patrick's announcement, I started unfiltered CCD time-series observations of the new OT at CBA Belgium Observatory on Jan 30.833 UT, 2008, using a 0.35-m f/6.3 telescope and ST-7XME CCD camera. Sky conditions were good, and the session lasted for 2 hours. The resulting light curve is presented at my website (www.cbabelgium.com) and shows a superhump-like structure with an amplitude of 0.15 mag. Given the short duration of the session, it's difficult to accurately establish the hump period. Using Peranso's implementation of the ANOVA method, I find a value of 0.063 +/- 0.009 d. The ANOVA period window and phase diagram for P = 0.063d are presented as well. Follow-up CCD and spectroscopic observations are highly needed to further study the lightcurve characteristics of this dwarf nova and to firmly secure its UGSU nature. Tonny Vanmunster CBA Belgium Observatory http://www.cbabelgium.com <http://www.cbabelgium.com> PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com <http://www.peranso.com> __._,_.___ Messages in this topic<http://groups.yahoo.com/group/cvnet-outburst/message/2242;_ylc=X3oDMTM1MmNkaGU3BF9TAzk3MzU5NzE0BGdycElkAzE0MTg0NzM2BGdycHNwSWQDMTcwNTA4Mjg0NQRtc2dJZAMyMjQyBHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTIwMTczNTc2MAR0cGNJZAMyMjQy>
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