WZ Sge star

Alert Notice 379: Support for Spitzer observations of tremendous outburst amplitude dwarf novae (TOADs)

May 16, 2008 : Dr. Steve Howell (NOAO) requests monitoring of a subset of the known and suspected tremendous outburst amplitude dwarf novae (TOADs) in support of Spitzer Space Telescope observations of these objects. Observers are asked to increase their monitoring of the objects in the table below in support of this campaign.  We note that several of these objects -- notably the WZ Sge stars WZ Sge, GW Lib, and V455 And -- are not expected to superoutburst during the next year, but observations are still encouraged in case they exhibit unexpected behavior.  

Alert Notice 407: Outburst of the UGWZ-type dwarf nova EG Cancri

October 12, 2009

The WZ Sge-type dwarf nova EG Cancri has been reported in outburst by Ian Miller (Swansea, Wales).  He reported EG Cnc at m(CV) = 14.3 on 2009 October 12.138 (JD 2455116.638).  Subsequent unfiltered time series observations by Miller reported to the AAVSO confirm EG Cnc at around magnitude 14.3; the star declined by approximately 0.1 magnitudes during the two-hour span of the time series.  Observations of EG Cnc are urgently requested at this time, including visual estimates, CCD photometry, and CCD time-series observations.

Special Notice #365: Correction to AAVSO Special Notice #364

July 19, 2013: In AAVSO Special Notice #364 (http://www.aavso.org/aavso-special-notice-364)
the variable 1RXS J213807.1+261958 (OT J213806.6+261957) was stated as being the northern of the pair. It is in fact the SOUTHERN of the pair, and is moving to the northeast.

The coordinates given in Special Notice #364 were correct and are repeated here for your convenience.

Special Notice #364: 1RXS J213807.1+261958 (OT J213806.6+261957) HST obs next week

July 19, 2013: HST/COS is scheduled to observe the WZ Sge-type variable 1RXS J213807.1+261958 (= OT J213806.6+261957) next week. Observations are scheduled for:

1RXS J213807.1+261958 (OT J213806.6+261957)
            2013 July 25 17:26:50 through 21:05:23 UT

The scheduling team will likely make their final decision early on July 24, and your observations will be essential now through July 26.

Special Notice #363: HS 2214+2845 (= V513 Peg) obs critical now

July 16, 2013: Based on your observations, the HST/COS team will be making the final decision tomorrow afternoon (2013 July 17) or the next morning whether to observe the dwarf nova HS 2214+2845 = V513 Peg on:

V513 Peg (HS 2214+2845) 2013 July 18 21:08:59 through July 19 01:04:23 UT

V513 Peg is 16.8V at minimum and 12.5V at maximum. Please monitor V513 Peg closely through July 19.