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 calibrated and linearized data acquired by the Rosetta Orbiter ALICE UV Spectrometer during the fly-by of the asteroid (2867) Steins, which occurred 2008-08-04 to 2008-10-05. Observations of Steins and calibration targets were made during this mission phase. 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 2867 Steins# 2008 September 1-8# Alice activity overview:# * 2008 Sep 01 09:00 - AL02 (decontamination; 25 hr, 22 hr heater + 3 hr cooldown)# * 2008 Sep 02 11:00 - AL07 (dark calibration; 3 hr)# * 2008 Sep 02 20:00 - AL13B, AL03B, AL06B (gam Gru cal; 4 hr)# * 2008 Sep 03 16:15 - AL13A, AL03A, AL06A (Vega cal; 4 hr)# * 2008 Sep 04 09:45 - AL08A (exosphere search; 19 hr)# * 2008 Sep 05 08:45 - AL08B (exosphere search; 4 hr)# * 2008 Sep 05 18:48 - AL09 (closest approach obs; 5 hr)# * 2008 Sep 06 16:45 - AL10 (closest approach bkg; 6 hr)# * 2008 Sep 07 00:45 - AL11 (exosphere bkg; 8 hr)# * 2008 Sep 07 06:45 - AL02 (decontamination; 25 hr, 22 hr heater + 3 hr cooldown) Processing :  The data in this data set are calibrated, CODMAC Level 4 data. As such, corrections for detector dead time, dark counts, flatfield, and effective area have generally been applied. In addition, the data have been 'linearized', that is resampled onto a common linear wavelength scale. The primary FITS header contains a list of which corrections have been applied to that file.  The CODMAC level 4 data product (LIN) differs from the CODMAC level 3 data product (SCI) in that the units of the data are photons s^-1 cm^-1 Angstrom^-1 (as opposed to photons s^-1 cm^-1) and the data have been resampled such that the wavelength scale is linear and common to all level 4 data.  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.

Confidence Level Overview :  Data confidence is nominal, meaning that all data have been validated by the Alice team and found as expected. Any exceptions are noted by the DATA_QUALITY field in the label files.   Review :    Data Coverage and Quality :  Data quality is good unless otherwise noted by the DATA_QUALITY keyword.   Limitations : These data have been calibrated and are in physical units