NEAR MSI Deblurred Images

Originators

Golish, D.R., DellaGiustina, D.N., Bennett, C.A., Becker, K.J.

Publisher

USGS Astrogeology Science Center

Publication Date

2023-05-26

Abstract

he Near Earth Asteroid Rendezvous – Shoemaker (NEAR; Cheng et al., 1997) spacecraft orbited and studied the surface of asteroid (433) Eros for a year from 14 February 2000 to 12 February 2001. Eros is a near-Earth S-type asteroid; it is approximately 34 km long with an 11×11 km cross-section. NEAR was the first mission to observe an asteroid from orbit and provided a broad dataset characterizing Eros’s surface in unprecedented detail. Unfortunately, prior to these observations, during a failed orbit insertion maneuver on 20 December 1998, the NEAR thrusters expelled >28 kg of hydrazine fuel on to the spacecraft. Some fraction of this volume was deposited on to the outer optical surface of the NEAR Multispectral Imager (MSI), causing spectrally-dependent blurring for all of MSI’s filters. Due to contamination on the outer optic of the NEAR-Shoemaker MSI, all surface-resolved images of Eros acquired by MSI had wavelength-dependent degradation. The MSI team designed and implemented a preliminary correction for the blur during mission operations and archived the results with the original camera data. While extremely successful, the preliminary correction was less effective for the 450 and 1100 nm passbands. Here we implement a new correction, based on the MSI team’s original process, to improve the blur remediation for all MSI filters, particularly those at the extreme wavelengths. The new method improves the effective resolution of the deblurred images over the preliminary remediation for all filters. Moreover, for all filters, our method preserves the 21-39 percent of the pixels that were lost (or obscured by artifacts) with the preliminary remediation. We apply the new method to the complete MSI dataset of resolved Eros images and archive the results for future scientific use. DOI: 10.17189/sv8w-5125 Access instructions: currently this archive is available from an Amazon S3 bucket. To access that please find the listing for each file above (or from this index.html listing). Example Amazon aws command-line options for listing or downloading this archive Listing the archive: aws s3 ls --no-sign-request --recursive s3://asc-pds-individual-investigations/nearmsi.gbl_golish_2023/ to copy the whole archive (to test, add --dryrun to command-line): aws s3 sync --no-sign-request s3://asc-pds-individual-investigations/nearmsi.gbl_golish_2023/ /my/local/path/. References: Golish, D.R., DellaGiustina, D.N., Becker, K.J., Bennett, C.A., Robinson, M., Crombie, M.K., Blur remediation in NEAR MSI images, Icarus, Volume 400, 2023, 115536, ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2023.115536. Cheng, A.F., Santo, A.G., Heeres, K.J., Landshof, J.A., Farquhar, R.W., Gold, R.E., Lee, S.C., 1997. Near-Earth Asteroid Rendezvous: Mission overview. JGRE 102, 23695–23708.https://doi.org/10.1029/96JE03364.

Contact and Distribution

Format

Image, Raster Data, Remote-sensing Data

Access Constraints

None

Access Scope

PDS

Use Constraints

Please cite authors

Supplemental Information

https://doi.org/10.1016/j.icarus.2023.115536, https://pds-smallbodies.astro.umd.edu/data_sb/missions/near/index.shtml

Native Data Set Environment

Astrogeology Theme

Asteroids, Image Processing, Remote Sensing

Mission Names

NEAR

Online Package Link

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

External File Size

(Archive 99 GB)

Online File Link

https://asc-pds-individual-investigations.s3.us-west-2.amazonaws.com/nearmsi.gbl_golish_2023/index.html

Access Instructions

See S3 download instructions above

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)

2000-02-14

Time Period of Content (stop)

2001-02-12

Currentness Reference

Ground condition

Progress

Complete

Update Frequency

None planned

Lineage

Process Date

2022-08-08

Source Title

Near Earth Asteroid Rendezvous (NEAR) Data Archive

Source Online Linkage

https://pds-smallbodies.astro.umd.edu/data_sb/missions/near/index.shtml

PDS Status

PDS 4 Archived

Geospatial Information

Target

Eros

System

Small Bodies

Direct Spatial Reference Method

Raster

Object Type

Grid Cell

Bit Type (8, 16, 32)

32

Quad Name

Horizontal Coordinate System Units

Degrees