May 5, 2008: Dr. Paula Szkody (University of Washington) and collaborators have requested our help in monitoring the cataclysmic variable RE J1255+266 for upcoming Hubble Space Telescope observations. Dr. Szkody requests nightly monitoring of this source beginning immediately, and continuing through 2008 May 15 UT.
RE J1255+266 is located at RA 12:55:10.80, Dec +26:42:27.0 (J2000)
Kunegunda Belle, Don Hoard and Steve Howell are observing two cataclysmic variables with Spitzer during the next couple of weeks. They request ground-based light curves spanning the observation intervals so that they can identify the state each variable is in during the Spitzer visits.
1. EX HYA (12:52:24.20, -29:14:56.0, AUID 000-BBT-323)
The observations for EX Hya are scheduled for:
2009-08-18 19:25:01.1 UT 3.6micron single exposure
2009-08-18 19:26:52.9 UT 4.5micron light curve
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.
The VY Sculptoris-class cataclysmic variable TT Ari has begun its first large decline since its deep minimum of 1982-1985. Observations of TT Ari are urgently requested. The 1982-1985 event reached a minimum of m(vis)=15.5, where it remained for approximately 3.5 years. Observers are asked to closely follow TT Ari through its current decline, and to continue monitoring TT Ari if and when it reaches a stable minimum.
March 3, 2010: Dr. Paula Szkody (U. Washington) has requested the help of AAVSO observers to provide monitoring of two cataclysmic variables, GW Lib and V842 Cen, in support of Hubble Space Telescope observations in March 2010. Observations of both objects are requested beginning immediately, with intensive observations requested beginning 48 hours prior to the scheduled HST visit.
June 12, 2013: Among the research options in the HST/COS CV campaign underway are observing two VY Scl stars in the low state, the only time the white dwarf is observable. OR And is now in its low state, at 18th V magnitude as of 2013 June 11 UT.
April 22, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable QZ Lib:
QZ Lib 2013 Apr 26 14:37:44 through 21:23:30 UT
