DATA_SET_DESCRIPTION |
Required Reading
================
The format of all Alice data are described in detail by the EAICD
document located in the /DOCUMENT directory. In addition, the
Rosetta Alice logbook file, RA_LOGBOOK_NNN.ASC, also located in
the DOCUMENT directory provides observational details such as
observation target, commanded exposure time, etc., for all Alice
data. The Alice team strongly recommends reading this
documentation before using the data.
Data Set Overview
=================
This data set contains uncalibrated data acquired by the Rosetta
Orbiter ALICE UV Spectrometer during the Lutetia flyby mission
phase, which took place between 2010-06-07 and 2010-09-10. A
detailed listing of all Alice observations is given in the
observation log file located in the DOCUMENT directory.
The following Alice observations were made during the period
covered by this data set:
# Flyby of asteroid (21) Lutetia
# 2010 July 5-13
# Alice activity overview:
# * 2010-Jul-05 12:50:00 - AL02 (decontamination; 23 hr, 22 hr heater
+ 1 hr cooldown)
# * 2010-Jul-06 14:00:00 - AL07 (dark calibration; 1 hr)
# * 2010-Jul-06 15:00:00 - AL06B, AL03B, AL08B (stellar cal [zet Cas];
1 hr each boresight)
# * 2010-Jul-08 14:30:00 - AL21A (exosphere search, +26 deg roll; 8 hr
20 min)
# * 2010-Jul-09 03:45:00 - AL21B (exosphere search, nominal roll; 5 hr
15 min)
# * 2010-Jul-09 09:15:00 - AL21C (exosphere search, -26 deg roll; 9 hr
40 min)
# * 2010-Jul-10 06:45:00 - AL21D (exosphere search, nominal roll; 4 hr
40 min)
# * 2010-Jul-10 11:00:00 - AL07 (dark calibration; 1 hr)
# * 2010-Jul-10 11:00:00 - Breakpoint 2
# * 2010-Jul-10 12:16:03 - AL31 (closest approach obs; 3 hr 49 min)
# * 2010-Jul-10 12:44:53 - Asteroid Flyby Mode
# * 2010-Jul-10 15:26:41 - Zero Phase
# * 2010-Jul-10 15:44:55.5 - Closest Approach (3160 km)
# * 2010-Jul-10 18:30:00 - AL09 (boresight alignment, raster scan [lam
Aql]; 1 hr 45 min)
# * 2010-Jul-11 04:45:00 - AL32 (closest approach bkg; 6 hr)
# * 2010-Jul-11 10:45:00 - AL07 (dark calibration; 1 hr)
# * 2010-Jul-11 12:45:00 - AL22A,B,C (exosphere bkg; 7.5 hr, 2.5 hr at
each roll angle: 0,+/-26 deg)
# * 2010-Jul-11 22:45:00 - AL06A, AL03A, AL08A (stellar cal [Vega]; 1
hr each boresight)
# * 2010-Jul-12 03:15:00 - AL02 (decontamination; 23 hr, 22 hr heater
+ 1 hr cooldown)
Processing
==========
The data in this data set are uncalibrated, CODMAC Level 2 data. As
such, corrections for detector dead time, dark counts, flatfield,
and effective area have not been applied. The primary FITS header
contains a list of which corrections have been applied to that
file.
Data
====
The data are in FITS format and text format. Each FITS file has a
detached PDS label so that they can be read either by FITS or PDS
tools. A detailed description of the data format is given in the
ALICE EAICD document located in the DOCUMENT directory of this
data set.
Ancillary Data
==============
No ancillary data included in this data set.
Coordinate System
=================
The geometry items SC_SUN_POSITION_VECTOR,
SC_TARGET_POSITION_VECTOR and SC_TARGET_VELOCITY_VECTOR provided in
the label of the data product are relative to the Earth Mean
Equator frame of J2000.
SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in the
PLANETOGRAPHIC coordinate system. These parameters are computed at
time t=START_TIME. Distances are given in km, angles in degrees.
Software
========
All FITS readers should be able to successfully read the data.
|