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INTERNATIONAL JUPITER WATCH NEWSLETTER

Nov 25, 1996

Report of ground-based images of Jupiter taken in support of the Galileo Callisto-3 encounter.

Submitted by Glenn Orton.

(This is not intended to be an all-inclusive report, but a report on known observations.)

Pic-du-Midi observations related to the C3 or earlier observations. All were made with a Schott RG 780 filter between the following approximate times.
Nov. 1, 15:07 - 17:58 UT
Nov. 2, 15:32 - 18:00 UT
Nov. 3, 14:45 - 18:57 UT
Nov. 6, 13:45 - 19:06 UT
Nov. 8, 12:40 - 18:41 UT

Wyoming Infrared Observatory (WIRO) observations used the Denver University middle-infrared camera, TNTCAM. Wavelengths covered include the 5 - 20 micron range.
Nov. 4, 23:57 - 22:42; Nov. 4, 23:57 - Nov. 5, 00:55 UT
Nov. 6, 00:17 - 22:47; Nov. 7, 11:17 - 00:47 UT
Nov. 8, 00:46 - 01:02 (5, 7, 12 microns only, as a result of high winds)

University of Hawaii, 88-in telescope. CCD observations between 628 and 945 nm wavelength, coupled with a tip-tilt image stabilization system.
Nov. 5, 5:50 - 6:30 UT
Nov. 6, 5:30 - 6:30 UT
Nov. 7, 4:30 - 6:00 UT

NASA Infrared Telescope Facility (IRTF):
Note that afternoon observing conditions were extremely cloudy, together with high humidity conditions, many hours of our time were wiped out. None of this time was considered photometric/radiometric, and so no special efforts were made to observe standard stars.
1. 1.58, 2.30, 3.55, and 4.78-micron observations with facility camera NSFCAM:
  Nov. 6, 4:01 - 4:30 UT
  Nov. 7, 0:05 - 4:40 UT*
  Nov. 8, 1:15 - 1:52 UT
  Nov. 9, 2:43 - 3:20 UT
  Nov. 10, 1:15 - 1:25 UT**
  
  * Observations of Jupiter were made on this afternoon (Nov. 7, 0:17 - 0:50 UT) (with ~2% (CVF) spectral resolution between 1.58 and 5.30 microns, but many of these images were wiped out by clouds.
  ** 1.58, 3.78 and 4.78 microns only; holes between clouds were too short for the longer integtation times required by 2.30 microns. We were truly attempting to "ambush" Jupiter between clouds!
  Note that additional observations were made on Nov. 11 and 12, using the auspices of the Galileo support program. Data in compressed tar file format are available via ftp from irtf.ifa.hawaii.edu in /pub/galileo, arranged by date (yymmdd*.xx.tar.Z), where xx is a non-essential file number.
2. 4.8, 7.85, 8.57, 10.74, 13.20, 17.2, 17.9, 19.7, 20.3, 24.5-micron observations with JPL middle-infrared camera MIRLIN. Most "basic" observations were of 13.2 and 17.9 microns for tropospheric temperatures and 8.57 microns for NH3 cloud distribution.
  Additional observations were made, time and weather permitting, at
  4.8 microns to supplement NSFCAM coverage of vertical cloud structure),
  7.85 microns for stratospheric temperatures,
  10.74 microns to determine the distribution of tropospheric NH3 gas, and
  17.2, 20.3 and 24.5 microns to provide denser vertical coverage of the tropospheric temperature profile.
  Nov. 6, 5:03 - 6:05 UT: basic three + 7.85 microns
  Nov. 7, 5:00 - 6:05 UT: basic three + 7.85 microns
  Nov. 8, 3:30 - 5:54 UT: basic three + 4.8, 10.74, 17.2, 19.7 and 20.3 microns
  Nov. 9, 4:01 - 5:56 UT: basic three + 4.8, 17.2, 19.7, and 20.3 microns
  Nov. 10, 1:52 - 3:15 UT: 7.85, 10.74, 17.2, 19.7, 20.3 and 24.5 microns - essentially filling in missing longitudinal coverage

Don Parker reports:

Attached are more Saturn images showing activity in the EZ. All were taken with my 16-in f/6 Newtonian, eyepiece projection, Lynxx PC CCD camera.
Best,
Don

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