AAVSO Alert Notice 429: Photometry Requested For Three Vestoid Near-Earth

AAVSO Alert Notice 429: Photometry Requested For Three Vestoid Near-Earth Objects

AAVSO Alert Notice 427

Photometry requested for three Vestoid Near-Earth Objects
January 7, 2011

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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.

The three objects are 1981 Midas (1973 EA), 4688 (1980 WF), and 137052 (1998 VO33). Hicks and collaborators are hoping to obtain photometry at the 0.1-magnitude level or better of all three objects during some or all of the first three months of 2011. All are fainter than 16th magnitude throughout their apparitions during this time frame. All will move perceptibly during the course of an observing run; observers with mounts that track sidereally should keep exposure times short (30s or less is likely) to make sure the asteroid does not move outside their photometric aperture during each exposure. Multiple exposures will likely be required to reach the required signal to noise for most observers, and 4688 (1980 WF) will likely be beyond the capabilities of most telescopes by early March 2011.

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