SDSS J154453.60+255348.8

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

Note: GP Com is being observed with HST on January 21, 2022.   YZ LMi observations are no longer needed.  -  Elizabeth O. Waagen, January 3, 2022

YZ LMi is to be observed with HST on December 30, 2021. CH UMa observations are no longer needed.  -  Elizabeth O. Waagen,  December 21, 2021

October 26, 2021

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.