2015
DOI: 10.1051/0004-6361/201525975
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Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko

Abstract: Aims. We derive for the first time the size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from the images taken by the Rosetta/OSIRIS imaging system. We highlight the possible physical processes that lead to these boulder size distributions. Methods. We used images acquired by the OSIRIS Narrow Angle Camera, NAC, on 5 and 6 August 2014. The scale of these images (2.44−2.03 m/px) is such that boulders ≥7 m can be identified and manually extracted from the datasets with… Show more

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Cited by 118 publications
(93 citation statements)
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References 48 publications
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“…The fitting regression line used to obtain the power-law index does not consider those points that are equally cumulatively repeated above 6 m because they represent a poor statistic that has not to be considered by the fit. This effect has previously been observed for larger boulder sizes as presented in Pajola et al (2015b) and Michikami et al (2008).…”
Section: On the Hatmehit Depression We Confirm The Results Ofmentioning
confidence: 61%
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“…The fitting regression line used to obtain the power-law index does not consider those points that are equally cumulatively repeated above 6 m because they represent a poor statistic that has not to be considered by the fit. This effect has previously been observed for larger boulder sizes as presented in Pajola et al (2015b) and Michikami et al (2008).…”
Section: On the Hatmehit Depression We Confirm The Results Ofmentioning
confidence: 61%
“…1, that has a gravitational source, and it could be interpreted as rockfall material deposit that originated from erosion, as supported by high slopes ranging from 20 • to 50 • . We compared the powerlaw index obtained in this work (−4.0 + 0.3/−0.4) to the results of global and local boulders distribution of Pajola et al (2015b), who classified the different size-frequency distribution on the basis of the possible acting formation processes. In addition, we pointed out that similar geomorphological settings on 67P comet show a similar power-slope distribution, suggesting that similar activity processes, pit formation or gravitational collapses and thermal fracturing events, most likely occurred in different areas of the comet and are responsible for the size-frequency distribution we see today (Pajola et al 2015b).…”
Section: Discussionmentioning
confidence: 99%
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“…Similar to many other regions on 67P Pajola et al 2015), Imhotep shows many boulders, with sizes (diameter) from 2 m (lower limit with our images) to 90 m. We counted 2207 boulders in Fig. 2.…”
Section: Bouldersmentioning
confidence: 99%
“…Their fall is guided by the gravitational attraction and is then oriented toward the nearest gravitational low. However, this transport mechanism is limited to boulders smaller than the meter scale because larger boulders are too big to be lifted (Groussin & Lamy 2003;Kelley et al 2013;Pajola et al 2015;Thomas et al 2015a). Since many boulders larger than one meter are visible on Imhotep, including some on smooth terrains, air-fall deposits cannot account for all of them.…”
Section: Smooth Terrainsmentioning
confidence: 99%