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Special Notice 257: Reminder to observe V455 And for HST observations

September 22, 2011: As detailed in AAVSO Alert Notice 448, Dr. Paula Szkody has requested monitoring of the WZ Sge-type cataclysmic variable V455 And through October 10. Observations tonight - September 22/23, tomorrow, and Saturday are crucial.

To quote Dr. Szkody from the Alert Notice: "The primary purpose of the monitoring is to know whether V455 And is in quiescence; if it is in outburst it will be too bright for the HST instrumentation. The decision whether to go forward with the HST observations will be made the evening of Friday, September 23/24, 2011, so the nights of September 22/23, 23/24, and 24/25 are the most critical for observations to be reported. Positive visual or V observations are preferred if at all possible, but fainter-than observations below V=14 are useful (<14.0 or fainter). Therefore, nightly observations are sufficient for now; 2-3 observations per night are requested during the nights of September 22/23 through 26/27, after which nightly observations may be resumed."

V455 And is currently at minimum, at magnitude V = 16.0. Sincere thanks to the many observers who have been providing excellent coverage of V455 And to date for this campaign!

Coordinates: RA: 23:34:01.45   Dec. +39:21:40.9 (2000.0)

Charts for V455 And (AUID 000-BDC-667) may be created using the Variable Star Plotter (VSP).

Please report your observations of V455 AND to the AAVSO using WebObs as soon as possible after making them.

Many thanks for your essential contributions!

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

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