Derivation of the final OSIRIS-REx OVIRS in-flight radiometric calibration

Amy A. Simon; Dennis C. Reuter; Dante S. Lauretta

doi:10.1117/1.JATIS.7.2.020501

Derivation of the final OSIRIS-REx OVIRS in-flight radiometric calibration

Amy A. Simon, Dennis C. Reuter, Dante S. Lauretta

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS) operates over the 1/40.4- to 4.3-μm wavelength range. Radiometric calibration over this broad range requires the use of multiple calibration sources. Initial OVIRS in-flight calibration coefficients were previously computed using ground calibration from visible integrating sphere and IR blackbody sources, cross-calibrated with Earth-observing satellites for visible wavelengths, and adjusted using the spectrum of the OSIRIS-REx mission's target body, asteroid (101955) Bennu. As part of the final in-flight calibration, we determined that the best calibration method removes out-of-band IR signal leakage prior to radiometric calibration and updated the calibration coefficients accordingly. These final calibration coefficients work well for data where the field of view is filled, and we document the possible artifacts in underfilled spots.

Original language	English (US)
Article number	020501
Journal	Journal of Astronomical Telescopes, Instruments, and Systems
Volume	7
Issue number	2
DOIs	https://doi.org/10.1117/1.JATIS.7.2.020501
State	Published - Apr 1 2021

Keywords

OSIRIS-Rex
calibration
optics
pipeline
radiometry
spectrometer

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Control and Systems Engineering
Instrumentation
Astronomy and Astrophysics
Mechanical Engineering
Space and Planetary Science

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10.1117/1.JATIS.7.2.020501

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title = "Derivation of the final OSIRIS-REx OVIRS in-flight radiometric calibration",

abstract = "The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS) operates over the 1/40.4- to 4.3-μm wavelength range. Radiometric calibration over this broad range requires the use of multiple calibration sources. Initial OVIRS in-flight calibration coefficients were previously computed using ground calibration from visible integrating sphere and IR blackbody sources, cross-calibrated with Earth-observing satellites for visible wavelengths, and adjusted using the spectrum of the OSIRIS-REx mission's target body, asteroid (101955) Bennu. As part of the final in-flight calibration, we determined that the best calibration method removes out-of-band IR signal leakage prior to radiometric calibration and updated the calibration coefficients accordingly. These final calibration coefficients work well for data where the field of view is filled, and we document the possible artifacts in underfilled spots. ",

keywords = "OSIRIS-Rex, calibration, optics, pipeline, radiometry, spectrometer",

author = "Simon, {Amy A.} and Reuter, {Dennis C.} and Lauretta, {Dante S.}",

note = "Funding Information: We are grateful to the entire OSIRIS-REx Team for making the encounter with Bennu possible and especially thank Victoria Hamilton, Ellen Howell, and Beth Clark for feedback on the OVIRS data and calibration quality. We also acknowledge Allen Lunsford for initial pipeline development, Nicolas Gorius for code assistance, and Richard Cosentino for data trending. This material is based on work supported by NASA under Contract NNM10AA11C issued through the New Frontiers Program. Disclosures: The authors declare no relevant financial interests in the manuscript and have no other potential conflicts of interest to disclose. Publisher Copyright: {\textcopyright} The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.",

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Derivation of the final OSIRIS-REx OVIRS in-flight radiometric calibration

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