Special Notice #130: Outburst of the dwarf nova UW Tri


October 28, 2008: According to observations by Gary Poyner, Carl Knight, and Tom Lloyd Evans (baavss-alert #1849 and elsewhere), the rarely-outbursting dwarf nova UW Tri is in full outburst. Gary Poyner notes that this is the first confirmed outburst of this star since 1995. This is a very high outburst amplitude star, likely approaching 8 magnitudes from quiescence to maximum. According to Kato et al (2001; IBVS #5116), the period is probably around 0.056 days, making this a good candidate for a WZ Sge-type system. All observations, including visual estimates, instrumental measurements, and CCD time-series are strongly encouraged at this time. Filtered observations are preferred for single instrumental observations, but please obtain S/N of at least 50 per observation when doing time-series.

The following are observations of this outburst submitted to the AAVSO up to the present time: m(CV) < 18.4, JD 2454764.66458 (2008 Oct 25.1646; E. Muyllaert); m(vis) = 14.3, JD 2454767.508 (2008 Oct 28.0080; T. Lloyd Evans); m(vis) = 14.6, JD 2454767.531 (2008 Oct 28.0310; T. Lloyd Evans); m(vis) = 14.3, JD 2454767.574 (2008 Oct 28.0740; T. Lloyd Evans). Observer G. Poyner also reported via baavss-alert/cvnet-outburst an observation of m(vis) = 14.2 on JD 2454767.531 (2008 Oct 28.031).

UW Tri is located at the following J2000 coordinates:

RA: 02 45 17.30 , Dec: +33 31 26.0

Charts for UW Tri may be plotted using VSP: http://www.aavso.org/observing/charts/vsp/index.html?pickname=UW%20Tri

Please submit all observations to the AAVSO as "UW Tri".

This AAVSO Special Notice was prepared by M. Templeton.


Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL: