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written by
Laurence Marschall, Glenn Snyder, P. Richard Cooper, Michael Hayden, and Rhonda Good
educational validator:
HelenMarie Hofman
This exercise incorporates software designed to find asteroids using digital images of the sky taken at different times, along with software designed to measure the precise positions of stars on images. In the first part of the exercise, students view pairs of images on the sky, align them so the stars overlap, and "blink" them to highlight moving asteroids. The software can then proceed to determine the astronomical coordinates of the asteroid. In the second part of the exercise, students analyze two images of the same asteroid taken at the same time from sites several thousand kilometers apart. Using parallax, the distance and tangential velocity of the asteroid can be found.
This is part of a larger collection of simulations, Project CLEA.
Please note that this resource requires
at least version 95 of MS-Windows.
<a href="https://www.compadre.org/astronomy/items/detail.cfm?ID=7809">Marschall, L, G. Snyder, P. Cooper, M. Hayden, and R. Good. CLEA: Astrometry of Asteroids. August 5, 2008.</a>
L. Marschall, G. Snyder, P. Cooper, M. Hayden, and R. Good, CLEA: Astrometry of Asteroids (2006), <http://public.gettysburg.edu/~marschal/clea/astlab.html>.
Marschall, L., Snyder, G., Cooper, P., Hayden, M., & Good, R. (2008, August 5). CLEA: Astrometry of Asteroids. Retrieved March 14, 2026, from http://public.gettysburg.edu/~marschal/clea/astlab.html
Marschall, L, G. Snyder, P. Cooper, M. Hayden, and R. Good. CLEA: Astrometry of Asteroids. August 5, 2008. http://public.gettysburg.edu/~marschal/clea/astlab.html (accessed 14 March 2026).
Marschall, Laurence, Glenn Snyder, P. Richard Cooper, Michael Hayden, and Rhonda Good. CLEA: Astrometry of Asteroids. 2006. 5 Aug. 2008. 14 Mar. 2026 <http://public.gettysburg.edu/~marschal/clea/astlab.html>.
@misc{
Author = "Laurence Marschall and Glenn Snyder and P. Richard Cooper and Michael Hayden and Rhonda Good",
Title = {CLEA: Astrometry of Asteroids},
Volume = {2026},
Number = {14 March 2026},
Month = {August 5, 2008},
Year = {2006}
}
%A Laurence Marschall %A Glenn Snyder %A P. Richard Cooper %A Michael Hayden %A Rhonda Good %T CLEA: Astrometry of Asteroids %D August 5, 2008 %U http://public.gettysburg.edu/~marschal/clea/astlab.html %O application/exe
%0 Electronic Source %A Marschall, Laurence %A Snyder, Glenn %A Cooper, P. Richard %A Hayden, Michael %A Good, Rhonda %D August 5, 2008 %T CLEA: Astrometry of Asteroids %V 2026 %N 14 March 2026 %8 August 5, 2008 %9 application/exe %U http://public.gettysburg.edu/~marschal/clea/astlab.html
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