rososiris2isis

This program will import and convert a PDS-formatted Rosetta OSIRIS image into an ISIS cube. The input file can be in compressed or decompressed form, and can be from OSIRIS's Wide-Angle Camera (WAC) or its Narrow-Angle Camera (NAC.) Input PDS files are converted to 32-bit if they are not already 32-bit.

Requirements

• Input PDS file (.img) (FROM)
• Output ISIS file name (.cub) (TO)

Instrument Overview

OSIRIS contains a high-resolution Narrow-Angle Camera (NAC) and a Wide-Angle Camera (WAC) that share a common shutter, filter wheel, and detector. The detector is a custom backside-illuminated 2048 x 2048 CCD with a UV-antireflection coating. OSIRIS-NAC has an off-axis three mirror system that minimizes the stray light hitting the CCD, and a field of view of 2.20 x 2.22 degrees. OSIRIS-WAC has an off-axis two mirror system which is also designed to minimize stray light and has a wider field of view of 11.34 x 12.11 degrees. OSIRIS-NAC has 12 filters that cover wavelengths 250-1000 nm at a resolution of 18.6 microradians/pixel, and OSIRIS-WAC has 14 filters over 240 - 720 nm at a resolution of 101 microradians/pixel. More detailed filter specifications are provided in the tables below.

Narrow-Angle Filters

The following table provides the specifications for each of the 16 OSIRIS-NAC filters.

OSIRIS NAC Filter Specifications

Name	Wavelength (nm)	FWHM (nm)
FFP-UV	600	600
FFP-IR	600	600
Neutral	640	520
NFP-Vis	600	600
Far-UV	269.3	53.6
Near-UV	360.0	51.1
Blue	480.7	74.9
Green	535.7	62.4
FFP-Vis	600	600
Orange	649.2	84.5
Hydra	701.2	22.1
Red	743.7	64.1
Ortho	805.3	40.5
Near-IR	882.1	65.9
Fe203	931.9	34.9
IR	989.3	38.2

Wide-Angle Filters

The following table provides the specifications for each of the 14 OSIRIS-WAC filters. One of the filter wheels is always set to Empty because of hardware constraints. The wavelengths and full-width half maximums (FWHMs) for the Empty filters are set to 0 in the ISIS cube label.

OSIRIS WAC Filter Specifications

Name	Wavelength (nm)	FWHM (nm)
Empty - allow use of filter wheel 2	None (set to 0 in ISIS label )	None (set to 0 in ISIS label )
Empty - allow use of filter wheel 1	None (set to 0 in ISIS label )	None (set to 0 in ISIS label )
UV245	246.2	14.1
CS	259.0	10.9
UV295	295.9	10.9
OH-WAC	309.7	4.1
UV325	325.8	10.7
NH	335.9	4.1
UV375	375.6	9.8
CN	388.4	5.2
Green	537.2	63.2
NH2	572.1	11.5
Na	590.7	4.7
VIS610	612.6	9.8
OI	631.6	4.0
R	629.8	156.8

Data Archive

The Rosetta data are available from the NASA PDS Small Bodies Node.

The file-naming convention for OSIRIS images on the PDS archive is: {C}{YYYYMM DD}T{HHMMSSUUU}{FF}{L}{I}F{A}{B}.img, where: {C} is set to either N or W to indicate a NAC or WAC image, respectively, {YYYYMM DD} is the year, month, and day, of image acquisition; T is a separator that stands for "Time", and {HHMMSSUUU} is the hour, minute, second, and milli-second of acquisition. {FF} indicates the image file type: ID is a normal image, TH is a thumbnail image, and PA, PB, and OL indicate different kinds of calibration data; {L} is the processing level of the image; {I} is the instance id of the image, F is a separator that stands for "Filter", {A} indicates the position of filter wheel #1, and {B} indicates the position of filter wheel #2.

References

Hviid, Stubbe F. "Osiris Experiment Data Record and Software Interface Specification (EDR/SIS) " Issue 3, 04/04/2011
H. U. Keller et al. "OSIRIS - The Scientific Camera System Onboard Rosetta." Space Science Reviews. Volume 128, Issue 1-4, pp 433-506.