3129 Bonestell is a main belt asteroid with an estimated diameter of about 10 km. It was discovered on June 25, 1979 by Helin, E. F. and Bus, S. J. at Siding Spring. The semi-major axis is 2.66 AU, the eccentricity is 0.218 and the inclination is 6.91 degrees.
Observations of this asteroid were made on five nights during April and May 2005. The resulting lightcurve was very asymmetric and indicated a period of only 2.978 hours.
Being uncertain of the result, I contacted Raoul Behrend in Geneva, Switzerland to see if he had any further data. Some additional data taken by René Roy from Blauvac, France were available. Raoul combined Roy's data with mine and came up with a similar result as shown below. With such a complex lightcurve, this would be an interesting target for further observation and shape modelling.