PDS_VERSION_ID = PDS3
/* FILE CHARACTERISTICS DATA ELEMENTS */
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 2880 /* FITS standard record length */
FILE_RECORDS = 10
FILE_NAME = "RA_WAVE_009.FIT"
DATA_FORMAT = FITS
/* INSTRUMENT AND MISSION DESCRIPTIVE DATA ELEMENTS */
INSTRUMENT_ID = "ALICE"
INSTRUMENT_NAME = "ALICE"
INSTRUMENT_TYPE = "ULTRAVIOLET SPECTROMETER"
INSTRUMENT_HOST_ID = "RO"
INSTRUMENT_HOST_NAME = "ROSETTA-ORBITER"
MISSION_ID = "ROSETTA"
MISSION_NAME = "INTERNATIONAL ROSETTA MISSION"
/* DATA OBJECT POINTERS IDENTIFICATION DATA ELEMENTS */
^PRIMARY_HEADER = ("RA_WAVE_009.FIT",1)
^WAVELENGTH_SOLUTION_TABLE = ("RA_WAVE_009.FIT",2)
^QUADRATIC_SOLUTION_HEADER = ("RA_WAVE_009.FIT",5)
^QUADRATIC_SOLUTION_TABLE = ("RA_WAVE_009.FIT",6)
^LINEAR_SOLUTION_HEADER = ("RA_WAVE_009.FIT",7)
^LINEAR_SOLUTION_TABLE = ("RA_WAVE_009.FIT",8)
^ROW_OFFSET_HEADER = ("RA_WAVE_009.FIT",9)
^ROW_OFFSET_TABLE = ("RA_WAVE_009.FIT",10)
/* PRODUCT, DATA SET, AND VOLUME DATA ELEMENTS */
PRODUCT_ID = "RA_WAVE_009"
PRODUCT_CREATION_TIME = 2016-03-28T16:49:00
DATA_SET_ID = "RO-C/CAL-ALICE-2-EXT2-V2.0"
PRODUCER_ID = "ROSETTA_ALICE"
PRODUCER_FULL_NAME = "ANDREW J. STEFFL"
PRODUCER_INSTITUTION_NAME = "SOUTHWEST RESEARCH INSTITUTE"
/* DATA OBJECT DEFINITIONS */
OBJECT = PRIMARY_HEADER
BYTES = 2880 /* RECORD_BYTES x RECORDS */
HEADER_TYPE = FITS
INTERCHANGE_FORMAT = ASCII
RECORDS = 1
DESCRIPTION = "
FITS (Flexible Image Transport System) format is defined in 'Astronomy and
Astrophysics', volume 376, page 359; bibcode 2001A&A...376..359H
This file contains the wavelength solution for the Alice UV
Spectrograph on the Rosetta spacecraft. The wavelength solution is
derived from a piece-wise linear fit to the locations of known spectral
features in observations of comet 67/P Churyumov-Gerasimenko.
Note that the actual wavelength range covered by the Alice UV spectrometer
is 700-2050 Angstroms. When a charge pulse strikes the readout anodes, the
detector electronics assigns it a 10-bit X value and a 5-bit Y-value. The
mapping of physical space on the detector to data space does not use the
full 10-bit X range. Instead, events on the detector are mapped into
columns 130-900 (approximately) in data space. The regions in data space
on either side of this range do not have any physical meaning, and are
conceptually similar to overscan areas found in CCD data."
END_OBJECT = PRIMARY_HEADER
OBJECT = WAVELENGTH_SOLUTION_TABLE
INTERCHANGE_FORMAT = BINARY
ROWS = 1024
COLUMNS = 1
ROW_BYTES = 8
DESCRIPTION = "
The 1024-element wavelength vector for data in the Alice common
reference frame."
OBJECT = COLUMN
NAME = "WAVELENGTH SOLUTION"
DATA_TYPE = IEEE_REAL /* 64-bit floating point */
BYTES = 8
START_BYTE = 1
END_OBJECT = COLUMN
END_OBJECT = WAVELENGTH_SOLUTION_TABLE
OBJECT = QUADRATIC_SOLUTION_HEADER
BYTES = 2880 /* RECORD_BYTES x RECORDS */
HEADER_TYPE = FITS
INTERCHANGE_FORMAT = ASCII
RECORDS = 1
DESCRIPTION = "
Polynomial coefiencients for the quadratic fit to the R-Alice wavelength
solution used for columns 0-89 and 917-1023."
END_OBJECT = QUADRATIC_SOLUTION_HEADER
OBJECT = QUADRATIC_SOLUTION_TABLE
INTERCHANGE_FORMAT = BINARY
ROWS = 3
COLUMNS = 1
ROW_BYTES = 8
DESCRIPTION = "
This extension contains polynomial coefficents used for columns 0-89 and
917-1023 of the wavelength solution. This is outside the active area of
the detector, and therefore beyond the actual wavelength range of the
data. This low-order fit is used at the ends of the wavelength solution to
avoid the wavelength solution going negative or rolling over and for
better results with auto-scaled plots."
OBJECT = COLUMN
NAME = "QUADRATIC WAVELENGTH SOLUTION"
DATA_TYPE = IEEE_REAL /* 64-bit floating point */
BYTES = 8
START_BYTE = 1
END_OBJECT = COLUMN
END_OBJECT = QUADRATIC_SOLUTION_TABLE
OBJECT = LINEAR_SOLUTION_HEADER
BYTES = 2880 /* RECORD_BYTES x RECORDS */
HEADER_TYPE = FITS
INTERCHANGE_FORMAT = ASCII
RECORDS = 1
DESCRIPTION = "
Polynomial coefiencients for the linear fit to the R-Alice wavelength
solution used for columns 0-89 and 917-1023."
END_OBJECT = LINEAR_SOLUTION_HEADER
OBJECT = LINEAR_SOLUTION_TABLE
INTERCHANGE_FORMAT = BINARY
ROWS = 2
COLUMNS = 1
ROW_BYTES = 8
DESCRIPTION = "
This extension contains the parameters for the best-fit linear wavelength
solution for R-Alice. It is used in the linearized data product"
OBJECT = COLUMN
NAME = "LINEAR WAVELENGTH SOLUTION"
DATA_TYPE = IEEE_REAL /* 64-bit floating point */
BYTES = 8
START_BYTE = 1
END_OBJECT = COLUMN
END_OBJECT = LINEAR_SOLUTION_TABLE
OBJECT = ROW_OFFSET_HEADER
BYTES = 2880 /* RECORD_BYTES x RECORDS */
HEADER_TYPE = FITS
INTERCHANGE_FORMAT = ASCII
RECORDS = 1
DESCRIPTION = "
FITS Header for the row offset extension."
END_OBJECT = ROW_OFFSET_HEADER
OBJECT = ROW_OFFSET_TABLE
INTERCHANGE_FORMAT = BINARY
ROWS = 32
COLUMNS = 1
ROW_BYTES = 4
DESCRIPTION = "
Optical distortion in the instrument (primarily coma) causes the image of
the entrance slit on the detector to appear somewhat curved. This
extension contains the offset (in pixels) of the centroid of a spectral
feature in a particular row from it's location in row 15, the center of
the detector. The offset is applied in the following manner:
lambda(X, Y) = lambda(X + offset(y), 15)"
OBJECT = COLUMN
NAME = "ROW OFFSET"
DATA_TYPE = IEEE_REAL /* 32-bit floating point */
BYTES = 4
START_BYTE = 1
END_OBJECT = COLUMN
END_OBJECT = ROW_OFFSET_TABLE
END