N. Oklay
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View article: CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko Open
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov–Gerasimenko. This…
Outcome of Collisions in the Early Outer Solar System Open
The processes leading to the formation of planetary systems leave behind a significant mass of small bodies - up to 35 Earth masses depending on the model [1] - orbiting at large heliocentric distance, and observed around 20% of Sun-like s…
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko Open
\nAims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time.\nMethods. The dust jet source regions were traced by the comprehensive imaging data set provided b…
View article: The Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenko
The Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenko Open
Landslides have been identified on several solar system bodies, and different mechanisms have been proposed to explain their runout length. We analyze images from the Rosetta mission and report the global characterization of such features …
Migrating Scarps as a Significant Driver for Cometary Surface Evolution Open
Rosetta observations of 67P/Churyumov‐Gerasimenko (67P) reveal that most changes occur in the fallback‐generated smooth terrains, vast deposits of granular material blanketing the comet's northern hemisphere. These changes express themselv…
Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov–Gerasimenko Open
By using the Rosetta/OSIRIS-NAC data set taken in 2014 August, we focus on the neck \nregion, called Hapi, located on 67P Churyumov–Gerasimenko’s Northern hemisphere. The \ngravitational potential and slopes of Hapi, coupled with the geolo…
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko Open
Aims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time. Methods. The dust jet source regions were traced by the comprehensive imaging data set provided by t…
Studying surface morphologies of comet 67P/C-G using discrete element simulations Open
We use the discrete element method (DEM) to numerically simulate the surface layer regolith dynamics of comet 67P/Churyumov-Gerasimenko (hereafter 67P/C-G) in order to infer mechanical properties of the surface material.
View article: The big lobe of 67P/Churyumov–Gerasimenko comet: morphological and spectrophotometric evidences of layering as from OSIRIS data
The big lobe of 67P/Churyumov–Gerasimenko comet: morphological and spectrophotometric evidences of layering as from OSIRIS data Open
Between 2014 and 2016, ESA's Rosetta OSIRIS cameras acquired multiple-filters images of the layered nucleus of comet 67P/Churyumov-Gerasimenko, ranging from ultraviolet to near-infrared wavelengths. No correlation between layers dispositio…
Tensile strength of 67P/Churyumov-Gerasimenko nucleus material from overhangs (<i>Corrigendum</i>) Open
After publication several small errors in the labelled positions of the features described in this paper were found. Correcting these errors results in changes to Table 1 and Figs. 4, 5, and 6. These changes are: the latitude and longitude…
On deviations from free-radial outflow in the inner coma of comet 67P/Churyumov-Gerasimenko Open
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) onboard the European Space Agency's Rosetta spacecraft acquired images of comet 67P/Churyumov–Gerasimenko (67P) and its surrounding dust coma starting from May 2014 un…
Exposed bright features on the comet 67P/Churyumov–Gerasimenko: distribution and evolution Open
Context. Since its arrival at the comet 67P/Churyumov–Gerasimenko in August 2014, the Rosetta spacecraft followed the comet as it went past the perihelion and beyond until September 2016. During this time there were many scientific instrum…
Tensile strength of 67P/Churyumov–Gerasimenko nucleus material from overhangs Open
We directly measured twenty overhanging cliffs on the surface of comet 67P/Churyumov–Gerasimenko extracted from the latest shape model and estimated the minimum tensile strengths needed to support them against collapse under the comet’s gr…
The global meter-level shape model of comet 67P/Churyumov-Gerasimenko Open
We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images of comet 67P/Churyumov-Gerasimenko (67P). The images with pixel scales in the range 0.2-3.0 m/pixel were acquired between August 2014 and Febr…
Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko Open
Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain. \n \nAims. Fracture formation, evolu…
The primordial nucleus of comet 67P/Churyumov-Gerasimenko Open
Context. We investigate the formation and evolution of comet nuclei and other trans-Neptunian objects (TNOs) in the solar nebula and primordial disk prior to the giant planet orbit instability foreseen by the Nice model. \n \nAims. Our goa…
Long-term survival of surface water ice on comet 67P Open
Numerous water-ice-rich deposits surviving more than several months on comet 67P/Churyumov-Gerasimenko were observed during the Rosetta mission. We announce the first-time detection of water-ice features surviving up to 2 yr since their fi…
Seasonal mass transfer on the nucleus of comet 67P/Chuyumov–Gerasimenko Open
Keller, H.U. et al.-- Full list of authors: Keller, H. U.; Mottola, S.; Hviid, S. F.; Agarwal, J.; Kührt, E.; Skorov, Y.; Otto, K.; Vincent, J. -B.; Oklay, N.; Schröder, S. E.; Davidsson, B.; Pajola, M.; Shi, X.; Bodewits, D.; Toth, I.; Pr…
View article: Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 03
Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 03 Open
On 2016 July 03, several instruments onboard ESA's Rosetta spacecraft detected signs of an outburst event on comet 67P, at a heliocentric distance of 3.32 au from the Sun, outbound from perihelion. We here report on the inferred properties…
Constraints on cometary surface evolution derived from a statistical analysis of 67P’s topography Open
Vincent, J.B. et al.-- Full list of the authors:Vincent, J. -B.; Hviid, S. F.; Mottola, S.; Kuehrt, E.; Preusker, F.; Scholten, F.; Keller, H. U.; Oklay, N.; de Niem, D.; Davidsson, B.; Fulle, M.; Pajola, M.; Hofmann, M.; Hu, X.; Rickman, …
The scattering phase function of comet 67P/Churyumov–Gerasimenko coma as seen from the Rosetta/OSIRIS instrument Open
The study of dust, the most abundant material in cometary nuclei, is pivotal in understanding the original materials forming the Solar system. Measuring the coma phase function provides a tool to investigate the nature of cometary dust. Ro…
The opposition effect of 67P/Churyumov–Gerasimenko on post-perihelion Rosetta images Open
High-resolution OSIRIS/Rosetta images of 67P/Churyumov-Gerasimenko acquired on the night run of 2016 April 9-10 show, at large scale, an opposition effect (OE) spot sweeping across Imhotep as the phase angle ranges from 0° to 17°. In this …