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eclipsing

Special Notice #60: Upcoming primary eclipse of ASAS182612

August 20, 2007: As described in Alert Notice 351, we are running an extended campaign on the newly discovered eclipsing Cepheid ASAS 182611+1212.6. Doug Welch has reminded me that the primary eclipse is predicted to be around August 28 around 0130UT. However, the eclipses are many days long, and the binary light curve is continuously changing, so don't just observe on the 28th.

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.

Special Notice #89: Rare Outburst of 0103+59 HT Cas

January 10, 2008

Coordinates: RA 01:10:12.98 Dec. +60:04:35.9 (2000.0)

AAVSO observer Glenn Chaple, Townsend, MA, reports that the UGSS+EA type dwarf nova HT Cas is in outburst for the first time since February 2002, with his visual observation of 13.6 on January 10.0076 UT. Makoto Uemura and colleagues at Hiroshima University (vsnet-alert 9807) confirmed the outburst with an observation of 14.02V on January 10.5278 UT. This outburst looks to be a normal, brief outburst, probably lasting only 2-3 days.

Special Notice #358: BD Pav obs critial tonight

June 12, 2013: Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 June 13) whether to observe BD Pav.

Your observations tonight (June 12/13) are CRITICAL. HST/COS is scheduled to observe the eclipsing dwarf nova BD Pav:

BD Pav 2013 June 14 04:40:42 through 09:46:09 UT

If you can observe BD Pav, a few V-band snapshots would be sufficient and very helpful. BD Pav is 15.4V at minimum and 12.4V at maximum.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484