From: cj@frostrus.jpl.nasa.gov
Date: Thu, 29 Jun 2000 16:12:09 -0700 (PDT)
To: larry.esposito@lasp.colorado.edu, alain.jouchoux@lasp.colorado.edu
Subject: UVIS config for satellite observations
Cc: amanda.hendrix@lasp.colorado.edu
Mime-Version: 1.0
Hi,
Attached is my recommendation for the UVIS configuration for the Jovian
satellite observations. The Callisto observations in Block 3 are included, so
that answers my action item also.
The attached file is just text. I will get to work on getting it into the CAR
format.
See you soon!
Candy
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Content-Description: jsatuvisconfig.txt
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UVIS Configuration for Satellite Observations
All satellite observations are unresolved, i.e. the target is smaller than a
pixel. Other than integration time, the UVIS configuration can be the same
for every observation:
1. Optical channels: Use only the EUV and FUV
2. Slit Width: 8 mR FUV and EUV
3. Spatial Binning: Do not bin any pixels. Window such that only the
center 6 pixels are returned. (Depending on the offset from the NAC, the
actual pixels selected might change, but for now select center 6.)
4. Spectral Binning: No spectral binning
5. Integration times:
Integration times will vary depending on the duration and goals of the
observation. There are three main types of observation: a) opposition surge,
b) longitude coverage, and c) eclipse observations. Himalia is a special
case.
Himalia. The Himalia observation duration is 6 hours, incl. turn time. The
goal (for ISS and VIMS) is to determine the rotation rate. Use 6 hr minus turn
time divided by 5 for the integration time. This will give us on the order of 5
one-hour integrations on Himalia.
A. Opposition Surge. Opposition surge observations are scheduled for Callisto
and Europa. The Callisto observations are short and are imbedded in UVIS's
Block 3 in Phase C. The integration time should equal the duration spent on
Callisto, which is approximately 10 minutes. The Europa observation is a 2.5 hr
uninterrupted chunk of time. For this observation use 20 min integration times.
B. Longitude Coverage. For the longitude coverage integration durations, use
the duration of the observation minus slew time (typically 4 - 8 minutes) and 20
sec instrument setup:
Observation Satellite ObservationApprox. Integration
TimeDuration (incl. Time x repetitions
turn time)(minutes)
356T02:00Ganymede00:2015
356T02:20Europa00:2015
356T02:40Callisto00:2015
358T01:20Europa00:4035
361T04:00Callisto00:4035
361T04:40Europa00:4035
361T05:20Ganymede00:5525 x 2
362T16:30Callisto00:3530
362T17:05Ganymede00:5525 x 2
363T10:20Europa00:4035
364T06:45Ganymede00:35 30
364T07:20Callisto00:3530
364T07:55Europa01:0530 x 2
366T06:10Europa00:5020 x 2
002T11:15Europa00:4030
002T11:55Ganymede01:0525 x 2
006T12:00Callisto00:4540
006T12:45Ganymede00:4540
010T09:45Ganymede00:4540
C. Eclipse Observations. Some observations are of the satellite totally
in eclipse, others include ingress or egress. In the case that the ingress
or egress is included we will need an extra trigger to change the integration
time. Integration times should be optimized when turn times are known.
Observation Satellite ObservationApprox. Integration
Start TimeDuration (incl. Time x repetitions
turn time)(minutes)
351T23:40Io00:42 (in)35
358T16:00Europa00:17 (out)10
01:33 (in)30 x 3
362T14:00Io00:36 (out)30
01:54 (in)25 x 4
363T07:30Ganymede00:16 (out)10
02:44 (in)20 x 8
364T09:00Io02:20 (in)20 x 7
00:10 (out)6
366T03:00Io02:20 (in)26 x 5
00:10 (out)6
001T22:00Io01:37 (in)30
00:18 (out)15
005T11:00Io02:15 (in)25 x 5
00:15 (out)10
010T10:30Europa 00:19 (out)15
02:45 (in)20 x 8
00:06 (out)3
011T15:30Ganymede00:16 (out)12
02:37 (in)30 x 5
01:07 (out)30 x 2