The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS): Spectral Maps of the Asteroid Bennu

Reuter, Dennis C.; Simon-Miller, A. A.; Hair, Jason; Lunsford, Allen; Manthripragada, Sridhar S.; Bly, Vincent T.; Bos, Brent J.; Brambora, Cliff; Caldwell, Erskine Preston; Casto, Gordon; Dolch, Z.; Finneran, Paul; Jennings, D.; Jhabvala, M.; Matson, Elizabeth A.; McLelland, M.; Roher, Wayne D.; Sullivan, Terry; Weigle, E.; Wen, Yuanyun; Wilson, D.; Лауретта, Д. С.

doi:10.1007/s11214-018-0482-9

Cited by 91 publications

(70 citation statements)

References 13 publications

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“…Because these laboratory spectra have the typical high signal‐to‐noise ratio of laboratory instruments, we also created a second library of noise‐added spectra with 5% random noise added at all wavelengths, which is consistent with the upper limit of noise observed in OVIRS spectra and is within the expected noise for the OVIRS instrument (Reuter et al. ). We generated 1000 random noise profiles and added them to each spectrum to determine how noise affects band depths and errors.…”

Section: Methodsmentioning

confidence: 96%

“…OVIRS will collect >450,000 spectra (resampled to 1393 channels) at spatial resolutions of ~20 m during global spectral mapping and ~4 m during reconnaissance mapping (Reuter et al. ). We will use spectral indices to reduce the hyperspectral data to single values that direct the science team to regions of interest on Bennu and that can be mapped to evaluate mineral and chemical presence and distribution.…”

Section: Introductionmentioning

confidence: 99%

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Visible–near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS‐REx

Kaplan

Hamilton

Howell

et al. 2020

Meteorit & Planetary Scien

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The primary objective of the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission is to return to Earth a pristine sample of carbonaceous material from the primitive asteroid (101955) Bennu. To support compositional mapping of Bennu as part of sample site selection and characterization, we tested 95 spectral indices on visible to near infrared laboratory reflectance data from minerals and carbonaceous meteorites. Our aim was to determine which indices reliably identify spectral features of interest. Most spectral indices had high positive detection rates when applied to spectra of pure, single-component materials. The meteorite spectra have fewer and weaker absorption features and, as a result, fewer detections with the spectral indices. Indices targeting absorptions at 0.7 and 2.7-3 lm, which are attributable to hydrated minerals, were most successful for the meteorites. Based on these results, we identified a set of 17 indices that are most likely to be useful at Bennu. These indices detect olivines, pyroxenes, carbonates, water/OH-bearing minerals, serpentines, ferric minerals, and organics. Particle size and albedo are known to affect band depth but had a negligible impact on interpretive success with spectral indices. Preliminary analysis of the disk-integrated Bennu spectrum with these indices is consistent with expectations given the observed absorption near 3 lm. Our study prioritizes spectral indices to be used for OSIRIS-REx spectral analysis and mapping and informs the reliability of all index-derived data products, including a science value map for sample site selection.

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Section: Methodsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Visible–near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS‐REx

Kaplan

Hamilton

Howell

et al. 2020

Meteorit & Planetary Scien

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show abstract

“…The spectrum shown in Figures 1 and 2 is the average of 17,061 radiance factor (RADF) or I/F spectra where Bennu filled approximately 40% of the FOV; the excursions in the spectra are representative of the point-to-point scatter in the data. The OVIRS calibrated radiance spectra were obtained according to methods described by 2,45 . In brief, OVIRS raw data are converted from counts/second to absolute radiance units using an automated calibration pipeline.…”

Section: Ovirs Instrument Calibration and Data Processingmentioning

confidence: 99%

Evidence for widespread hydrated minerals on asteroid (101955) Bennu

Barucci¹,

Highsmith²,

Small³

et al. 2019

Nat Astron

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“…The OSIRIS-REx Camera Suite (OCAMS [2]) PolyCam panchromatic camera confirmed the top-like shape of the asteroid [3] and imaged the surface at scales down to 0.33 m/pixel, while the MapCam instrument imaged at scales down to 1.1 m/pixel in four colors and a panchromatic filter. The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS [4]) and the OSIRIS-REx Thermal Emission Spectrometer (OTES [5]) measured disk-integrated spectra covering a full asteroid rotation before Bennu filled their respective fields of view.…”

mentioning

confidence: 99%

Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis

et al. 2019

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Christensen, P. R.; Drouet d'Aubigny, C. Y.; Hamilton, V. E.; Reuter, D. C.; Rizk, B.; Simon, A. A.; Asphaug, E.; Bandfield, J. L.; Barnouin, O. S.; Barucci, M. A.; Bierhaus, E. B.; Binzel, R. P.; Bottke, W. F.; Bowles, N. E.; Campins, H.; Clark, B. C.; Clark, B. E.; Connolly, H. C.; Daly, M. G.; Leon, J. de; Delbo', M.; Deshapriya, J. D. P.; Elder, C. M.; Fornasier, S.; Hergenrother, C. W.; Howell, E. S.; Jawin, E. R.; Kaplan, H. H.; Kareta, T. R.; Le Corre, L.; Li, J.-Y.; Licandro, J.; Lim, L. F.; Michel, P.; Molaro, J.; Nolan, M. C.; Pajola, M.; Popescu, M.; Garcia, J. L. Rizos; Ryan, A.; Schwartz, S. R.; Shultz, N.; Siegler, M. A.; Smith, P. H.; Tatsumi, E.; Thomas, C. A.; Walsh, K. J.; Wolner, C. W. V.; Zou, X.-D. and Lauretta, D. S. (2019). Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis. Nature Astronomy, 3 pp. 341-351. For guidance on citations see FAQs.Length of main text: 2956 words Length of methods: 3605 words Length of legends: 565 words Number of references: 53 main text, 69 including methods and supplementary information (refs 67 to 69 are cited in the SI only) , we show that asteroid (101955) Bennu's surface is globally rough, dense with boulders and low in albedo. The number of boulders is surprising given Bennu's moderate thermal inertia, suggesting that simple models linking thermal inertia to particle size do not adequately capture the complexity relating these properties. At the same time, we find evidence for a wide range of particle sizes with distinct albedo characteristics. Our findings imply that ages of Bennu's surface particles span from the disruption of the asteroid's parent body (boulders) to recent in situ production (micron-scale particles).

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The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS): Spectral Maps of the Asteroid Bennu

Cited by 91 publications

References 13 publications

Visible–near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS‐REx

Visible–near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS‐REx

Evidence for widespread hydrated minerals on asteroid (101955) Bennu

Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis

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