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AAVSO Alert Notice

Alert Notice 431: Request to monitor SDSS074545 for HST Observations

February 25, 2011: Dr. Paula Szkody (University of Washington) has requested our help in monitoring the cataclysmic variable SDSS074545 (SDSS J074531.91+453829.5) for upcoming Hubble Space Telescope observations. The HST observations are scheduled to be made during the week of 2011 March 7-14. Dr. Szkody also observed this object with HST in October-November 2007 (see AAVSO Alert Notice 359).

Alert Notice 429: Photometry requested for three "Vestoid" Near-Earth Objects

January 8, 2011: Dr. Michael David Hicks (Jet Propulsion Laboratory) contacted the AAVSO requesting precision 
photometry of three solar system objects in support of NASA's DAWN mission to Vesta.  These objects, called 
"Vestoids", are near-Earth objects with similar reflectance spectra to Vesta itself, suggesting they may be fragments 
of that larger body. Broad-band photometry may help constrain object sizes and compositions.

Alert Notice 427: Observing campaign on BM Ori and the Trapezium region

November 23, 2010: The AAVSO requests ground-based observations of the Trapezium region of the Orion Nebula (M42), along with surrounding regions in Orion, in conjunction with upcoming observations with the MOST Satellite.  All AAVSO observers are encouraged to participate in this project, and we are requesting observations for a number of different targets from both instrumental and visual observers.

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