Rotation Rates In The Koronis Family, Complete To H≈11.2

Details Rotation Rates In The Koronis Family, Complete To H≈11.2 Rotation Rates In The Koronis Family, Complete To H≈11.2

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5916s&link_type=abstract

American Astronomical Society, DPS meeting #38, #59.16; Bulletin of the American Astronomical Society, Vol. 38, p.596

Astronomy and Astrophysics

Astronomy

Scientific paper

We summarize the results of an observational survey of rotation lightcurves for members of the Koronis asteroid family that we conducted during the period 1998 to 2005 using CCD imaging cameras at seven different observatories. Our goals were to reduce the selection biases among known rotation lightcurve parameters for Koronis family members, and to lay the foundation for future spin vector and shape determinations. A total of 375 individual lightcurves yield new or refined rotation periods for the 24 survey objects. Our results complete the Koronis family rotation rate sample down to H≈11.2. For those objects with sufficient coverage in solar phase angle we also determined Lumme-Bowell solar phase parameters, and for four objects we obtained V-R colors. The distribution of rotation rates in the available sample of 41 Koronis member objects is non-Maxwellian at a confidence level of 99%. It also seems qualitatively consistent with the effects of long-term thermal YORP torques, as proposed by Vokrouhlický et al. (2003) to explain the distribution of the ten Koronis member spin vectors that have already been determined (Slivan, 2002 and Slivan et al., 2003).

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