A high-resolution global basemap of (101955) Bennu

C. A. Bennett , D. N. Dellagiustina , K. J. Becker , T. L. Becker , K. L. Edmundson , D. R. Golish , R. J. Bennett , K. N. Burke , C. N. U. Cue , B. E. Clark , J. Contreras , J. D. P. Deshapriya (1) , C. Drouet d'Aubigny , G. Fitzgibbon , E. R. Jawin , T. Q. Nolan , N. A. Porter , M. M. Riehl , H. L. Roper , B. Rizk , Y. Tang , Z. Zeszut , R. W. Gaskell , E. E. Palmer , J. R. Weirich , M. M. Al Asad , L. Philpott , M. G. Daly , O. S. Barnouin , H. L. Enos , D. S. Lauretta

1 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics

In early 2019, NASA's OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission surveyed asteroid (101955) Bennu with a collection of instruments, including the OSIRIS-REx Camera Suite (OCAMS) PolyCam imager. Using PolyCam panchromatic images, we constructed a globally controlled basemap of Bennu at an approximate ground sample distance of 5 cm with a mean spatial accuracy of ~30 cm. The basemap was photometrically normalized using a Minneart phase angle correction. New mapping methods were developed to combine images of Bennu's irregular shape and extremely rough surface into a nearly seamless mosaic. Here we present the global basemap of Bennu and discuss the image processing techniques used to construct a high-resolution mosaic of an irregular small body.

Mots clés: Asteroids; Asteroid surfaces; Image processing; Near-earth objects

Domaines: Planète et Univers [physics]

C. A. Bennett, D. N. Dellagiustina, K. J. Becker, T. L. Becker, K. L. Edmundson, et al.. A high-resolution global basemap of (101955) Bennu. Icarus, 2021, 357, ⟨10.1016/j.icarus.2020.113690⟩. ⟨insu-03713794⟩