Abstract
Simultaneous photometric and polarimetric observations of asteroid 3 Juno have been carried out with a low-resolution spectropolarimeter HBS at Okayama Astrophysical Observatory from 2000 August 4 to 8. The amplitude of the light curve was 0.14 mag with almost the same brightness maxima and 0.10 mag different minima. Polarimetric data showed one maximum and minimum in the absolute values of polarization degree |Pr |, and the difference attained 0.149% in the V band. The minimum of |Pr | appeared around the second minimum of the light curve, which means that a bright area exists on the surface of 3 Juno. We found that the values of |Pr | tend to increase 0.1%-0.2% with wavelength, and this result is consistent with the general tendency of S-type asteroids. In addition, we might find that the increase rate of |Pr | is steeper in wavelengths longer than 7000 A. From the variation of polarization degree with the rotation of 3 Juno, we estimated the albedo of the bright area with a simple model and obtained a range of 0.19-0.41.
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