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Introducing the asteroid (2154) Underhill | ||||||||||
This main-belt asteroid was named for the late Anne B. Underhill, astrophysicist and Life Member of the Royal Astronomical Society of Canada. IAU number 2154 was issued to this 21-kilometre rock after it was discovered by C.J. van Houten, I. van Houten-Groeneveld, and T. Gehrels in 1960. I met Anne only once, during a ceremony at Vancouver recognizing her long membership in the Society. Anne worked at NASA Goddard SFC, managing the very successful Copernicus and IUE space telescope programs. Her professional interest was hot stars, which she studied using the ultraviolet instruments in those satellites. My image (inset) was acquired using the camera and telescope seen here. The CCD image is superimposed on a Digital Sky Survey image with the image's dimensions indicated by the tilted box. Because the telescope was tracking the stars, the asteroid left a trail. The small square (with date) shows the position of the asteroid at the beginning of the exposure, as computed by JPL Horizons. I used SIMBAD to find the stars' magnitudes. The image obviously reached stars much fainter than the one marked 16.07 because Horizons computed the asteroid's magnitude as 16.5. The CCD image is a stack of seventeen 30-second exposures. To view them as a movie, click here (528K GIF). |
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Source for Underhill portrait: CASCA | ||||||||||