From spencer Mon Mar  8 18:23:38 1993
From spencer Mon Mar  8 18:23:38 1993
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Date: Mon, 8 Mar 93 18:23:35 MST
From: spencer (John R. Spencer)
To: spencer@sunkng
Subject: Io Volcano News
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Status: RO

                                                      March 8, 1993.

Last night, 1993/02/04 UT, Darren Depoy, Rick Pogge, Ray Bertram and I
obtained 2.36 micron images of Io's eclipse and occultation by
Jupiter, using the Ohio State infrared camera "OSIRIS" at the 72"
Perkins telescope at Lowell Observatory.  This the first observation
of a Jupiter occultation of Io's hot spots at this wavelength:
previous Jupiter occultations have always been observed with ProtoCAM
at the IRTF, at 3.5 or 3.8 micron wavelength.

The 2.36 micron magnitude of Io's volcanic emission in eclipse
indicated no major change in volcanic activity since K observations at
the IRTF in January and February.  Io was not directly resolved, but
photometry of the Jupiter occultation ingress lightcurve will provide
about eight resolution elements across Io perpendicular to Jupiter's
limb.