Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002em%26p...91...95g&link_type=abstract
Earth, Moon, and Planets, v. 91, Issue 2, p. 95-105 (2002).
Astronomy and Astrophysics
Astronomy
1
Apparent Motion, Asteroid, Asteroid Physical Observation
Scientific paper
The astrometric observations of asteroids are often performed near their opposition, where they have faster apparent motions and brighter visual magnitudes. However, the physical observations of asteroids (photometric and spectral) often require longer exposure times as well as brighter magnitudes for better signal-to-noise ratio, which are combined effects of both apparent moving speeds and visual magnitudes. We derive the equations of the apparent motion of asteroid in geocentric ecliptic coordinates. Comparison of the apparent magnitudes of asteroid at opposition and at stationary shows that the magnitude differences in the two cases are around 1 magnitude in average for most main belt asteroids, but are much larger for Near Earth Asteroids. Combining with comparison of asteroid apparent motion, the proper time for asteroid physical observation in different cases are discussed.
Gao Jian-Jian
Zhu Jin
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