On the ambiguity of rotational periods of asteroids - The peculiar case of 52 Europa

Details On the ambiguity of rotational periods of asteroids - The peculiar case of 52 Europa On the ambiguity of rotational periods of asteroids - The peculiar case of 52 Europa

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...56..319z&link_type=abstract

Icarus (ISSN 0019-1035), vol. 56, Nov. 1983, p. 319-324.

Astronomy and Astrophysics

Astronomy

13

Asteroids, Astronomical Photometry, Europa, Light Curve, Planetary Rotation, Amplitudes, Magnitude, Maxima

Scientific paper

An analysis of the present data set on the rotational properties is made in order to select a number of asteroids, for which new observations should be performed to check the reliability of their adopted parameters. The most significant example is presented and it concerns the very large asteroid 52 Europa. Its lightcurve presented two maxima and two minima during 1976 opposition leading to a period of 11h.26. In 1983 the same number of extrema appeared in 5h.63 only. The amplitude was small in both oppositions (≡0m.08 and ≡0m.10, respectively) and suggests the possibility of surface irregularities which dominate the light variation. The period determination of asteroids is more difficult than previously believed.

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