DT Oct is scheduled to be observed by HST/COS TOMORROW (2-13 May 23-24 UT). GW Lib is the next target, scheduled for 2013 May 30 UT, and V1108 Her after that, on ~2013 June 3. Details are in AAVSO Special Notice #354 .
YOUR OBSERVATIONS OF THESE STARS ARE CRUCIAL!
Many thanks and good observing - Elizabeth Waagen, AAVSO HQ