AAVSO International Database

Special Notice #364: 1RXS J213807.1+261958 (OT J213806.6+261957) HST obs next week

July 19, 2013: HST/COS is scheduled to observe the WZ Sge-type variable 1RXS J213807.1+261958 (= OT J213806.6+261957) next week. Observations are scheduled for:

1RXS J213807.1+261958 (OT J213806.6+261957)
            2013 July 25 17:26:50 through 21:05:23 UT


The scheduling team will likely make their final decision early on July 24, and your observations will be essential now through July 26.

Special Notice #362: OR And and AX For obs critical now

July 8, 2013: The VY Scl variable OR And continues in its low state, so it has been scheduled for HST/COS observations. Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 July 9) whether to observe OR And on:

OR And 2013 July 10 11:47:01 through 15:56:12 UT

OR And is ~18V in its low state and ~14.5V in its high state.

Alert Notice 486: Spectroscopy and photometry campaign on three bright Wolf Rayet stars

June 26, 2013: Dr. Noel Richardson (Université de Montréal) is helping coordinate a very large ProAm campaign (over 20 professional and amateur astronomers) this summer on three bright Wolf Rayet stars in Cygnus. Dr. Richardson, fellow co-PIs Drs. Tony Moffat (Université de Montréal), Nicole St.-Louis (Université de Montréal), and Thomas Eversberg (Schnoerringen Telescope Science Institute, Waldbroel, Germany), and their colleagues invite AAVSO spectroscopists and photometrists to participate in this campaign.

Special Notice #361: CC Scl observations DATE REVISED

June 24, 2013: The date given in AAVSO Special Notice #360 for the HST/COS  observations of the SU UMa-type dwarf nova CC Scl has been REVISED from June 27 to:

CC Scl   2013 Jun 29 03:19:13 through 05:54:10 UT

The HST team will be making a final decision early on June 28 about observing CC Scl based substantially on your observations, so they are essential.
 

Special Notice #360: CC Scl observations critical this week

June 24, 2013: HST/COS is scheduled to observe the SU UMa-type dwarf nova CC Scl:

CC Scl   2013 June 27 02:12:04 through 05:39:30 UT

The HST team will be making a final decision early on June 26 about observing CC Scl based substantially on your observations, so they are essential.
 

Special Notice #359: OR And monitoring needed for HST/COS campaign

June 12, 2013: Among the research options in the HST/COS CV campaign underway are observing two VY Scl stars in the low state, the only time the white dwarf is observable. OR And is now in its low state, at 18th V magnitude as of 2013 June 11 UT.

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.

Coordinates (2000.0)