December 5, 2012: As announced in AAVSO Special Notice #313 (www.aavso.org/aavso-special-notice-313 ), HST COS is scheduled to observe the UG-type dwarf nova V405 Peg
7 December 2012 02:31:20 through 07:50:03 UT
Remember that your observations over the next 36 hours will be crucial for the HST scheduling team to decide whether to carry out the observations. The target must be at minimum for HST to observe it safely. V405 Peg is 17.9V at minimum and 13V at maximum. Observations as indicated below throughout the HST observation window and for a few days afterwards are also crucial.
As instructed in AAVSO Alert Notice 471 (www.aavso-alert-notice-471 ), for CCD observers, simultaneous photometry [shortly before, during, and after the HST observations] would be ideal. B filter would be best for a light curve, although for the magnitude estimates, a V measurement would be best. An uninterrupted light curve would be better than cycling between filters. This target is likely too faint for positive visual observations, but if possible they are welcome, as are visual fainter-than observations fainter than magnitude 15.0.
Coordinates: R.A. 23 09 49.14 Dec +21 35 17.2 (2000.0)
Charts for V405 Peg may be created using VSP (www.aavso.org/vsp ).
Please report observations promptly to the AAVSO International Database using the name V405 PEG. If you see the target in outburst, please contact the AAVSO immediately and post a message to the Observations and Campaigns & Observations Reports forum (www.aavso.org/forum ).
Thank you for your contributions and good observing!
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
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