Bennu OSIRIS-REx OCAMS Global ALBEDO Mosaic 6.25cm

Primary Authors

Lunar and Planetary Laboratory, University of Arizona

Originators

Golish, D. R., Shultz, N. K., Becker, T. L., Becker, K. J., Edmundson, K. L., DellaGiustina, D. N., et al.

Publisher

USGS Astrogeology Science Center

Publication Date

2021-06-26

Abstract

In 2019, NASA's OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security and Regolith Explorer) mission globally surveyed asteroid (101955) Bennu with a collection of instruments, including the OSIRIS-REx Camera Suite (OCAMS) PolyCam imager. Using PolyCam panchromatic images acquired at low phase angles (~8°), we constructed a near-global albedo map of Bennu with a ground sample distance of 6.25 cm/pixel (Golish et al. 2021a). The images were photometrically normalized using the published ROLO phase function and Lommel-Seeliger disk function for Bennu (Golish et al., 2021b) and orthorectified using the v20 global shape model (Barnouin, et al. (2020); Daly et al. (2020), produced by the OSIRIS-Rex Laser Altimeter (OLA; Daly et al. (2017)), with a ground sample distance of 88 cm. Mapping and global control methods were adapted from Bennett et al. (2021) and Edmundson et al. (2020). Highlights:

• We produced a near-global albedo map of asteroid Bennu at a ground sample distance of 6.25 cm, covering ±55° latitude.
• Images were rectified to a 3D digital terrain model with a mean facet size of 88 cm.
• Images were photometrically normalized to 0° phase angle using a ROLO phase function.

This download is an 8bit version of the original mosaic. The mapping used to convert to 8bit was a linear stretch from 0.002 - 0.007 to 1 - 254, maintaining 0 as NoDATA. The original 32bit version is also available for download from:

• Bennu_global_ShapeV20_GndControl_ROLOphase_ALBEDO_v6 - Albedo mosaic in 32bit floating point.

References: Barnouin, O. S., Daly, M. G., Palmer, E. E., Johnson, C. L., Gaskell, R. W., Al Asad, M., et al., (2020). Digital terrain mapping by the OSIRIS-REx mission. Planetary and Space Science, 180(October 2018), 104764. https://doi.org/10.1016/j.pss.2019.104764 Bennett, C. A., DellaGiustina, D. N., Becker, K. J., Becker, T. L., Edmundson, K. L., Golish, D. R., et al., (2021). A high-resolution global basemap of (101955) Bennu. Icarus, 357(October 2019), 113690. https://doi.org/10.1016/j.icarus.2020.113690 Daly, M. G., Barnouin, O. S., Dickinson, C., Seabrook, J., Johnson, C. L., Cunningham, G., et al., (2017). The OSIRIS-REx Laser Altimeter (OLA) Investigation and Instrument. Space Science Reviews, 212(1-2), 899-924. https://doi.org/10.1007/s11214-017-0375-3 Daly, M. G., Barnouin, O. S., Seabrook, J. A., Roberts, J., Dickinson, C., Walsh, K. J., et al., (2020). Hemispherical differences in the shape and topography of asteroid (101955) Bennu. Science Advances, 6(41), eabd3649. https://doi.org/10.1126/sciadv.abd3649 Edmundson, K. L., Becker, K. J., Becker, T. L., Bennett, C. A., Dellagiustina, D. N., Golish, D. R., et al., (2020). PHOTOGRAMMETRIC PROCESSING of OSIRIS-REX IMAGES of ASTEROID (101955) BENNU. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 5(3), 587-594. https://doi.org/10.5194/isprs-Annals-V-3-2020-587-2020 Golish, D. R., DellaGiustina, D. N., Li, J.-Y., Clark, B. E., Zou, X.-D., Smith, P. H., et al., (2021). Disk-resolved photometric modeling and properties of asteroid (101955) Bennu. Icarus, 357, 113724. https://doi.org/10.1016/j.icarus.2020.113724 Golish, D. R., Shultz, N. K., Becker, T. L., Becker, K. J., Edmundson, K. L., DellaGiustina, D. N., et al., (2021). A high-resolution normal albedo map of asteroid (101955) Bennu. Icarus, 355, 114133. https://doi.org/10.1016/j.icarus.2020.114133 Lauretta, D. S., Enos, H., Polit, A. T., Roper, H. L., & Wolner, C. W. V. (2021). OSIRIS-REx at Bennu: Overcoming challenges to collect a sample of the early Solar System. In A. Longobardo (Ed.), Sample Return Missions (pp. 163-194). Amsterdam, Netherlands: Elsevier.

Purpose

construction a near-global albedo map of Bennu with a ground sample distance of 6.25 cm/pixel (Golish et al. 2021a)

Contact and Distribution

Format

Global Mosaic

Access Constraints

please cite authors

Access Scope

PDS

Use Constraints

public domain

Series Id

6

Supplemental Information

https://doi.org/10.1016/j.icarus.2020.114133, https://sbn.psi.edu/pds/resource/orex/ocams.html, https://www.asteroidmission.org/

Native Data Set Environment

GDAL, ISIS v3

Astrogeology Theme

Asteroids, Cartography, Image Processing, Photogrammetry, Remote Sensing, Sampling and analysis

Mission Names

OSIRIS-REx

Instrument Names

OCAMS

Online Package Link

https://astrogeology.usgs.gov/search/map/bennu_osiris_rex_ocams_global_albedo_mosaic_6_25cm

External File Size

300 MB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Bennu/Bennu_global_ShapeV20_GndControl_ROLOphase_ALBEDO_8bit_v6.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Data Status and Quality

Time Period of Content (start)

2019-03-07

Time Period of Content (stop)

2019-03-07

Currentness Reference

Ground condition

Progress

Complete

Update Frequency

As needed

Completeness Report

See: Golish, D. R., Shultz, N. K., Becker, T. L., Becker, K. J., Edmundson, K. L., DellaGiustina, D. N., et al. (2021). A high-resolution normal albedo map of asteroid (101955) Bennu. Icarus, 355, 114133. https://doi.org/10.1016/j.icarus.2020.114133

Process Description

The mapping used to convert to 8bit was a linear stretch from 0.002 - 0.007 to 1 - 254, maintaining 0 as NoDATA. See: Golish, D. R., Shultz, N. K., Becker, T. L., Becker, K. J., Edmundson, K. L., DellaGiustina, D. N., et al. (2021). A high-resolution normal albedo map of asteroid (101955) Bennu. Icarus, 355, 114133. https://doi.org/10.1016/j.icarus.2020.114133

Source Title

OSIRIS-REx PDS archive

Source Online Linkage

https://sbn.psi.edu/pds/resource/orex/

PDS Status

PDS 3 Compatible

Attribute Accuracy Report

Best Effort

Horizontal Positional Accuracy Report

Accurate to Control Net

Geospatial Information

Target

Bennu

System

Small Bodies

Minimum Latitude

-90

Maximum Latitude

90

Minimum Longitude

0

Maximum Longitude

360

Direct Spatial Reference Method

Raster

Object Type

Grid Cell

Raster Row Count (lines)

12568

Raster Column Count (samples)

25134

Bit Type (8, 16, 32)

8

Quad Name

Radius A

250

Radius C

250

Control Net

OLA v20

Bands

1

Pixel Resolution (meters/pixel)

0.0625

Scale (pixels/degree)

69.81388

Map Projection Name

Equirectangular

Latitude Type

Planetocentric

Longitude Direction

Positive East

Longitude Domain

0 to 360