V1239 Her

Alert Notice 758: Monitoring requested for 11 dwarf novae in support of HST observations in 2021-2022

Note:  GP Com observations will take place April 29-30, 2022; coverage is needed until May 20. See Alert Notice 775.  -  Elizabeth O. Waagen, April 27, 2022

SDSS J154453.60+255348.8 will not be observed by HST during April. V1239 Her and V493 Gem have been observed and observations of them are no longer needed.   -  Elizabeth O. Waagen, April 5, 2022

Alert Notice 586: Status of 20 cataclysmic variables needed for WHT campaign

July 7, 2017: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance in determining the status of 20 eclipsing cataclysmic variables (CVs) in order to select one system in outburst for observation with the William Herschel Telescope (WHT) at La Palma, to detect and study spiral density waves in the system. The WHT observations will begin on 2017 July 11 UT.