* Astronomy

Members Login
Post Info TOPIC: Asteroid (2867) Steins


L

Posts: 131433
Date:
RE: Asteroid (2867) Steins
Permalink  
 


Asteroid Steins' hidden gems

ESA's Rosetta spacecraft snapped images of asteroid Steins as it flew by the diamond-shaped asteroid on 5 September 2008, revealing a tiny world with a big history of collisions.
Read more



__________________


L

Posts: 131433
Date:
Permalink  
 



__________________


L

Posts: 131433
Date:
Permalink  
 

Title: The Cratering History of Asteroid (2867) Steins
Authors: S. Marchi (1), C. Barbieri (1), M. Kueppers (2), F. Marzari (1), B. Davidsson (3), H.U. Keller (4), S. Besse (5), P. Lamy (5), S. Mottola (6), M. Massironi (1), G. Cremonese (7) ((1) Padova University, (2) ESA-ESAC Madrid, (3) Uppsala University, (4) MPI Lindau, (5) LAM, (6) DLR Berlin, (7) INAF Padova)

The cratering history of main belt asteroid (2867) Steins has been investigated using OSIRIS imagery acquired during the Rosetta flyby that took place on the 5th of September 2008. For this purpose, we applied current models describing the formation and evolution of main belt asteroids, that provide the rate and velocity distributions of impactors. These models coupled with appropriate crater scaling laws, allow the cratering history to be estimated. Hence, we derive Steins' cratering retention age, namely the time lapsed since its formation or global surface reset. We also investigate the influence of various factors -like bulk structure and crater erasing- on the estimated age, which spans from a few hundred Myrs to more than 1Gyr, depending on the adopted scaling law and asteroid physical parameters. Moreover, a marked lack of craters smaller than about 0.6km has been found and interpreted as a result of a peculiar evolution of Steins cratering record, possibly related either to the formation of the 2.1km wide impact crater near the south pole or to YORP reshaping.

Read more (158kb, PDF)

__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard