CH UMa

Alert Notice 796: Monitoring requested for 12 dwarf novae in support of HST observations in 2022-2023

Notes: V479 And was successfully observed in December 2022.  -  Elizabeth O. Waagen, February 3, 2023

HST observations of ZTF18acxhphf were successfully carried out. V479 And has been rescheduled for December 2022. Please continue nightly snapshots of it and CH UMa, the other December target, as well as beginning coverage of ASASSN-18dg, the January 2023 target.  -  Elizabeth O. Waagen, December 6, 2022

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

Note:  RY Ser was scheduled for May and for June but was in outburst or too close to outburst to be a safe target. It may be rescheduled. GP Com observations did take place.  -  Elizabeth O. Waagen, July 5, 2022

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

Alert Notice 210: 1147+49 BC Ursae Majoris in outburst AND Reminders on 0409-71 VW Hydri and 2138+43 SS Cygni AND Current activity on some cataclysmic variables

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
INTERNET: aavso@aavso.org
Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 210 (July 7,1995)

1147+49 BC URSAE MAJORIS IN OUTBURST

The dwarf nova-type cataclysmic variable (SU UMa subclass) BC UMa is undergoing an
outburst, as indicated by the following observations: