Cheruskia Occultation Dec 24, 2004

Observer: Richard Nolthenius (831) 479-6506, rinolthe at

Asteroid, Star: (568) Cheruskia occulted 2UCAC 32855047

Telescope: 10" Meade LX200 f/10, equatorial, 40mm eyepiece

Location: Pt. Reyes National Seashore hostel, W.Long= 122 51.68', N. Lat 38 02.65, elev 147ft, WGS84 coordinates from USGS map at

Method: Voice/WWV/tape recorder

Sky: clear, good seeing, star visibility: continuously visible but only a few tenths fainter and this would be very hard to keep in continuous view

Timings: Dec 24, 2004 UT

D: 09:54:58.35 acc=0.25sec, reaction time 0.8 sec

R: 09:54:59.82 acc=0.2sec, reaction time 0.4 sec

Comments: Began continuous observing at 09:53:00, end 09:56:55 UT. No satellite events of duration longer than 0.3 seconds. Otherwise, strong confidence in the timings above. Too faint to comment on any possible gradual or step-wise events. Asteroid might have been visible during D, but with only 1.5 second occultation, can't be sure. It would have been on the ragged edge of the magnitude limit. Expected duration 7.2 seconds, so I was evidently near one of the limits, although nominally quite close to the centerline.

Report: Notification of this web posting sent to David Dunham. No report to Manek yet.