I report the synodic period of  (888) Parysatis to be
5.933 +/- 0.001hrs with an amplitude of 0.242mag +/- 0.010mag
 

Fig. 1

Volunteer Observatory's 0.35m SCT operating at f/6.4  was used for observations of MPL 888 during four nights in December 2006. 30 sec exposures were used with  an R band filter and an  SBIG ST10XME CCD, binned 2x2 operating at -30C. This asteroid was selected from the CALL website's "List of Potential Lightcurve Targets" for 4Q 2006. ( B. Warner, Dr. Allan Harris,  2006). Observations were started while the asteroid was < 30 degrees elevation. The R band filter limited the first order effects of atmospheric extinction and magnitude errors were ~0.010 mag for the entire data set.

ACP ver 4.2 is used for observatory automation with Maxim DL 4.53 for CCD control and acquistion. The temperature tracking feature was also enabled in Maxim permitting the temp compensation feature of the Optec TCF-s focuser. CCD image calibration was performed utilizing master bias, darks and flat frames. Images were calibrated as well as plate solved immediately after acquisition using ACP /Maxim. AIP4Win version 2.1.10 was used to perform differential photometry of the calibrated data and an initial period determination of ~5.93 hrs was determined with a maximum amplitude of 0.242mag +/- 0.010mag using spreadsheet analysis ( Fig. 1). MPO Canopus 9.1.0.2 was utilized for differential photometry  to refine the period determination. The results of the analysis are graphically displayed below in  Fig. 2.

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Last Updated 2007.01.09