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Alert Notice 423: Request for observations of V455 AND in support of HST observations

August 30, 2010: Dr. Paula Szkody (U. Washington) has requested the help of AAVSO observers in monitoring the WZ Sge-type cataclysmic variable V455 And in support of Hubble Space Telescope ultraviolet spectroscopic observations scheduled for 6:55-15:20 2010 September 11 UT (the night of Friday, September 10/11) (JD 2455450.78819 - 2455451.13889). Observations are requested beginning immediately and continuing through September 20. This monitoring is crucial to these observations.

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AAVSO International Database

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AAVSO Alert Notice Archive

This AAVSO Alert Notice Archive page is obsolete as of July 31, 2017. For the current version of this page, please go to https://www.aavso.org/aavso-alert-notices-for-observing-campaigns-and-discoveries

This page contains links to past AAVSO Alert Notices, ordered by issue number with most recent issues first. AAVSO Alert Notices are issued irregularly when researchers request critical supporting observations, or we have been notified of highly significant events.

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Alert Notice 422: Observing Campaign on Hubble's First Variable in M31: M31_V1

July 16, 2010: An observing campaign is being carried out on M31_V1, the first variable star discovered in M31 by Edwin Hubble. The Hubble Heritage Team, with Dr. Keith Noll, Space Telescope Science Institute (STScI), as Principal Investigator, plans to observe M31_V1 with the Hubble Space Telescope (HST), and needs to know the phase of this Cepheid variable. Although basic parameters are known for this star, no recent photometry exists, so observations are required to generate current phase information.

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