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IAU Circular No. 8570
OCCULTATION BY PLUTO I (CHARON)
L. A. Young, C. B. Olkin, and E. F. Young, Southwest ResearchInstitute; and R. G. French, Wellesley College, report theirobservations of an occultation on July 11 of the star 2UCAC26257135 by Pluto I (Charon). E. F. Young and K. Shoemakerobserved with 0.2-s integration times using the visitor instrumentPHOT (unfiltered) on the 4.2-m SOAR telescope at Cerro Pachon. C.Olkin, C. Ruhland, and L. A. Young observed via a 240-s I-bandexposure trailed at 1".5/s with the 4-m Blanco telescope (+ MosaicII camera) at Cerro Tololo. R. French, B. Gregory, L. A. Young,and R. Galvez observed via 0.5-s I-band exposures using the 0.9-mSMARTS telescope (+ Tek2K No. 3 CCD camera) at Cerro Tololo. Allthree sites report durations of 55.3 +/- 0.2 s. The chord lengthis 1179 +/- 4 km, which serves as a lower limit on the diameterfrom these telescopes. No obvious atmosphere was detected.
