Ground and In-Flight Calibration of the OSIRIS-REx Camera Suite

Golish, D. R.; d’Aubigny, C. Drouet; Rizk, B.; DellaGiustina, D. N.; Smith, Peter H.; Becker, K. J.; Shultz, N.; Stone, Tom; Barker, M. K.; Mazarico, E.; Tatsumi, Eri; Gaskell, R. W.; Harrison, Lori; Merrill, Catherine; Fellows, C.; Williams, B.; O’Dougherty, Stefan; Whiteley, Mitch; Hancock, Jed J.; Clark, B. E.; Hergenrother, C. W.; Лауретта, Д. С.

doi:10.1007/s11214-019-0626-6

Cited by 61 publications

(48 citation statements)

References 24 publications

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“…We identified morphologic evidence of mass movement on Bennu by assessing images of the surface taken by the PolyCam instrument, which is part of the OSIRIS‐REx Camera Suite (OCAMS) (Golish et al, 2020; Rizk et al, 2018). PolyCam is a narrow‐angle adjustable‐focus (field of view, 13.8–14.3 mrad) panchromatic (~500–800 nm) Ritchey‐Chrétien camera designed to image the low‐reflectance surface of Bennu.…”

Section: Methods and Datasetsmentioning

confidence: 99%

Global Patterns of Recent Mass Movement on Asteroid (101955) Bennu

et al. 2020

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The exploration of near‐Earth asteroids has revealed dynamic surfaces characterized by mobile, unconsolidated material that responds to local geophysical gradients, resulting in distinct morphologies and boulder distributions. The OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security‐Regolith Explorer) mission confirmed that asteroid (101955) Bennu is a rubble pile with an unconsolidated surface dominated by boulders. In this work, we documented morphologies indicative of mass movement on Bennu and assessed the relationship to slope and other geologic features on the surface. We found globally distributed morphologic evidence of mass movement on Bennu up to ~70° latitude and on spatial scales ranging from individual boulders (meter scale) to a single debris flow ~100 m long and several meters thick. The apparent direction of mass movement is consistent with the local downslope direction and dominantly moves from the midlatitudes toward the equator. Mass movement appears to have altered the surface expression of large (≥30m diameter) boulders, excavating them in the midlatitudes and burying them in the equatorial region. Up to a 10 ± 1 m depth of material may have been transported away from the midlatitudes, which would have deposited a layer ~5 ± 1 m thick in the equatorial region assuming a stagnated flow model. This mass movement could explain the observed paucity of small (<50‐m diameter) craters and may have contributed material to Bennu's equatorial ridge. Models of changes in slope suggest that the midlatitude mass movement occurred in the past several hundred thousand years in regions that became steeper by several degrees.

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Section: Methods and Datasetsmentioning

confidence: 99%

Global Patterns of Recent Mass Movement on Asteroid (101955) Bennu

et al. 2020

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“…Impact craters on Bennu were found by examining images acquired by the OSIRIS‐REx Camera Suite (OCAMS) (Golish et al, 2020; Rizk et al, 2018) during the Approach, Preliminary Survey, and Detailed Survey phases of the OSIRIS‐REx mission (Lauretta et al, 2017). OCAMS imaged Bennu globally at a range of illumination and viewing geometries (DellaGiustina et al, 2019), and multiple OSIRIS‐REx team members searched the images for craters (Walsh et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

The Morphometry of Impact Craters on Bennu

Daly

Bierhaus

Barnouin

et al. 2020

Geophysical Research Letters

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Bennu is an~500-m-diameter rubble-pile asteroid that is the target of detailed study by the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission. Here we use data from the OSIRIS-REx Laser Altimeter to assess depth-to-diameter ratios (d/D) of 108 impact craters larger than 10 m in diameter. The d/D of craters on Bennu ranges from 0.02 to 0.19. The mean is 0.10 ± 0.03. The smallest craters show the broadest range in d/D, consistent with d/D measurements on other asteroids. A few craters have central mounds, which is interpreted as evidence that a more competent substrate lies a few meters beneath them. The range of d/D narrows as crater size increases, with craters larger than 80 m tending toward smaller d/D. At large scales, increases in target strength with depth, combined with target curvature, may affect crater morphometry.

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“…With a field of view five times that of PolyCam, MapCam images serve as context for PolyCam images acquired within the same observation. Golish et al (2020a) describe OCAMS pre-and in-flight calibration procedures. Ground calibrations were conducted for all three OCAMS cameras to characterize bias level, dark current rates, flat field response, stray light, and radiometric performance.…”

Section: Ocams: the Osiris-rex Camera Suitementioning

confidence: 99%

“…Principal point and radial distortion parameters in the PolyCam model vary as a function of focus position. Modelled differently from MapCam (Golish et al, 2020a), radial distortion is given as…”

Section: Polycam Distortion Modelmentioning

confidence: 99%

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Photogrammetric Processing of Osiris-Rex Images of Asteroid (101955) Bennu

Edmundson

Becker

et al. 2020

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. The principal objective of the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission is to retrieve a sample of the asteroid (101955) Bennu and return it to Earth. OSIRIS-REx arrived at Bennu in December 2018. Images of the asteroid by the OSIRIS-REx Camera Suite (OCAMS) were photogrammetrically controlled to produce a global basemap and site-specific image mosaics essential to the selection of a primary and backup sample site, which were announced in December 2019. In the control process, OCAMS images were registered to shape models created from OSIRIS-REx Laser Altimeter (OLA) data and from the process of stereophotoclinometry. This paper summarizes the photogrammetric control to date of images collected at Bennu. We briefly review the mission and the OCAMS imaging sensors. We then describe the photogrammetric control process for the global mapping campaign and targeted reconnaissance surveys of candidate sample sites. Finally, we discuss ongoing and future work.

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Ground and In-Flight Calibration of the OSIRIS-REx Camera Suite

Cited by 61 publications

References 24 publications

Global Patterns of Recent Mass Movement on Asteroid (101955) Bennu

Global Patterns of Recent Mass Movement on Asteroid (101955) Bennu

The Morphometry of Impact Craters on Bennu

Photogrammetric Processing of Osiris-Rex Images of Asteroid (101955) Bennu

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