Coordinated observations of asteroids 1219 Britta and 1972 Yi Xing

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asteroids, Astronomical Spectroscopy, Electrophotometry, Light Curve, Flyby Missions, Galileo Spacecraft, Interstellar Extinction, Asteroids, Britta, Yi Xing, Earth-Based Observations, Physical Properties, Characteristics, Rotation Period, Retrograde Motion, Lightcurves, Albedo, Amplitude, Classification, Spectra, Optical Properties, Magnitude, Data, S Asteroids, Color, Telescope Methods, Photoelectric Methods, Period, Reflectance, Orbital Elements, Astronomy

Scientific paper

Britta's sidereal rotation period is found to be 5.57497±0.00013 hr and its rotation is retrograde. The lightcurve amplitude ranged from 0.60 to 0.70 mag, depending on phase angle. Britta can be classified as an S-type asteroid based on its measured spectra and albedo. The absolute magnitude and slope parameter derived from the lightcurve maxima are H0 = 11.67±0.03 and G0 = 0.30±0.04. A 0.002 mag deg-1 phase reddening in B-V was also measured. 1972 Yi Xing was less well observed but a unique synodic period of 14.183±0.003 hr was determined. The observed lightcurve amplitude was 0.18 mag. Five-color measurements are consistent with an S-type classification. For an assumed slope parameter G = 0.25, Yi Xing's (lightcurve maximum) absolute magnitude H0 = 13.32±0.01.

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