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Golish DR, Simon AA, Reuter DC, Ferrone S, Clark BE, Li JY, DellaGiustina DN, Drouet d’Aubigny C, Rizk B, Lauretta DS. Cross-Instrument Comparison of MapCam and OVIRS on OSIRIS-REx. Space Sci Rev 2022; 218:5. [PMID: 35250103 PMCID: PMC8885487 DOI: 10.1007/s11214-022-00873-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Two of the instruments onboard the OSIRIS-REx spacecraft, the MapCam color imager and the OVIRS visible and infrared spectrometer, observed the surface of asteroid (101955) Bennu in partially overlapping wavelengths. Significant scientific advances have been enabled by using data from these two instruments in tandem, but a robust statistical understanding of their relationship is needed for future analyses to cross-compare their data as accurately and sensitively as possible. Here we present a cross-instrument comparison of data acquired by MapCam and OVIRS, including methods and results for all global and site-specific observation campaigns in which both instruments were active. In our analysis, we consider both the absolute radiometric offset and the relative (normalized) variation between the two instruments; we find that both depend strongly on the photometric and instrumental conditions during the observation. The two instruments have a large absolute offset (>15%) due to their independent radiometric calibrations. However, they are very consistent (relative offset as low as 1%) when each instrument's response is normalized at a single wavelength, particularly at low phase angles where shadows on Bennu's rough surface are minimized. We recommend using the global datasets acquired at 12:30 pm local solar time for cross-comparisons; data acquired at higher phase angles have larger uncertainties.
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Affiliation(s)
- D. R. Golish
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - A. A. Simon
- NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - D. C. Reuter
- NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - S. Ferrone
- Department of Physics and Astronomy, Ithaca College, Ithaca, NY USA
| | - B. E. Clark
- Department of Physics and Astronomy, Ithaca College, Ithaca, NY USA
| | - J.-Y. Li
- Planetary Science Institute, Tucson, AZ USA
| | | | | | - B. Rizk
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - D. S. Lauretta
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
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Golish DR, Drouet d'Aubigny C, Rizk B, DellaGiustina DN, Smith PH, Becker K, Shultz N, Stone T, Barker MK, Mazarico E, Tatsumi E, Gaskell RW, Harrison L, Merrill C, Fellows C, Williams B, O'Dougherty S, Whiteley M, Hancock J, Clark BE, Hergenrother CW, Lauretta DS. Ground and In-Flight Calibration of the OSIRIS-REx Camera Suite. Space Sci Rev 2020; 216:12. [PMID: 32025061 DOI: 10.1007/s11214-017-0460-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 11/27/2019] [Indexed: 05/29/2023]
Abstract
The OSIRIS-REx Camera Suite (OCAMS) onboard the OSIRIS-REx spacecraft is used to study the shape and surface of the mission's target, asteroid (101955) Bennu, in support of the selection of a sampling site. We present calibration methods and results for the three OCAMS cameras-MapCam, PolyCam, and SamCam-using data from pre-flight and in-flight calibration campaigns. Pre-flight calibrations established a baseline for a variety of camera properties, including bias and dark behavior, flat fields, stray light, and radiometric calibration. In-flight activities updated these calibrations where possible, allowing us to confidently measure Bennu's surface. Accurate calibration is critical not only for establishing a global understanding of Bennu, but also for enabling analyses of potential sampling locations and for providing scientific context for the returned sample.
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Affiliation(s)
- D R Golish
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | | | - B Rizk
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - D N DellaGiustina
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - P H Smith
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - K Becker
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - N Shultz
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - T Stone
- United States Geological Survey Astrogeology Science Center, Flagstaff, AZ USA
| | - M K Barker
- 3Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - E Mazarico
- 3Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - E Tatsumi
- 4Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
| | - R W Gaskell
- 5Planetary Science Institute, Tucson, AZ USA
| | - L Harrison
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - C Merrill
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - C Fellows
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - B Williams
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - S O'Dougherty
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - M Whiteley
- 6Space Dynamics Laboratory, Utah State University, Logan, UT USA
| | - J Hancock
- 6Space Dynamics Laboratory, Utah State University, Logan, UT USA
| | - B E Clark
- 7Department of Physics and Astronomy, Ithaca College, Ithaca, NY USA
| | - C W Hergenrother
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - D S Lauretta
- 1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
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Golish DR, Drouet d’Aubigny C, Rizk B, DellaGiustina DN, Smith PH, Becker K, Shultz N, Stone T, Barker MK, Mazarico E, Tatsumi E, Gaskell RW, Harrison L, Merrill C, Fellows C, Williams B, O’Dougherty S, Whiteley M, Hancock J, Clark BE, Hergenrother CW, Lauretta DS. Ground and In-Flight Calibration of the OSIRIS-REx Camera Suite. Space Sci Rev 2020; 216:12. [PMID: 32025061 PMCID: PMC6979463 DOI: 10.1007/s11214-019-0626-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 11/27/2019] [Indexed: 05/18/2023]
Abstract
The OSIRIS-REx Camera Suite (OCAMS) onboard the OSIRIS-REx spacecraft is used to study the shape and surface of the mission's target, asteroid (101955) Bennu, in support of the selection of a sampling site. We present calibration methods and results for the three OCAMS cameras-MapCam, PolyCam, and SamCam-using data from pre-flight and in-flight calibration campaigns. Pre-flight calibrations established a baseline for a variety of camera properties, including bias and dark behavior, flat fields, stray light, and radiometric calibration. In-flight activities updated these calibrations where possible, allowing us to confidently measure Bennu's surface. Accurate calibration is critical not only for establishing a global understanding of Bennu, but also for enabling analyses of potential sampling locations and for providing scientific context for the returned sample.
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Affiliation(s)
- D. R. Golish
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | | | - B. Rizk
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | | | - P. H. Smith
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - K. Becker
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - N. Shultz
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - T. Stone
- United States Geological Survey Astrogeology Science Center, Flagstaff, AZ USA
| | - M. K. Barker
- Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - E. Mazarico
- Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - E. Tatsumi
- Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
| | | | - L. Harrison
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - C. Merrill
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - C. Fellows
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - B. Williams
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - S. O’Dougherty
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
| | - M. Whiteley
- Space Dynamics Laboratory, Utah State University, Logan, UT USA
| | - J. Hancock
- Space Dynamics Laboratory, Utah State University, Logan, UT USA
| | - B. E. Clark
- Department of Physics and Astronomy, Ithaca College, Ithaca, NY USA
| | | | - D. S. Lauretta
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ USA
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