Three Periods in Asteroid 4197 Brightness Variations

Details Three Periods in Asteroid 4197 Brightness Variations Three Periods in Asteroid 4197 Brightness Variations

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sosyr..35..383p&link_type=abstract

Solar System Research, v. 35, Issue 5, p. 383-389 (2001).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

In 1996, photometric observations of the near-Earth asteroid NEA 4197 (1982 TA) were performed at the Crimean Astrophysical Observatory. More than 2000 brightness measurements in the V band were made. The harmonic data analysis at a fairly high significance level revealed two close periods, P_1 = 3^h_.5372 +/- 0^h_.0005 (amplitude 0^m_.4) and P_2 = 4^h_.367 +/- 0^h_.001 (amplitude 0^m_.2). The third period, P_3= 20^h_.26 +/- 0^h_.05 (amplitude about 0^m_.15), was found at a lower significance level. The conclusion was drawn that the asteroid is a binary system. Its components rotate with the periods P_1and P_2, and P_3is probably related to the orbital motion of the components. Assuming that the diameters of both components are equal to 2 km, the orbital radius equals 4.4 km.

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