The morphology and surface processes of Comet 19/P Borrelly

Britt, D. T.; Boice, D. C.; Buratti, B. J.; Campins, H.; Nelson, Robert M.; Oberst, J.; Sandel, B. R.; Stern, S. A.; Soderblom, L. A.; Thomas, N.

doi:10.1016/j.icarus.2003.09.004

Cited by 98 publications

(69 citation statements)

References 15 publications

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“…Past studies on the geomorphology of cometary nuclei (1P/ Halley, 19P/Borrelly, 81P/Wild 2, 9P/Tempel 1, 103P/Hartley 2, and 67P/Churyumov-Gerasimenko) have revealed several types of terrains and geological features (Britt et al 2004;Brownlee et al 2004;Thomas et al 2007Thomas et al , 2013aThomas et al ,b, 2015bBasilevsky & Keller 2007;Sierks et al 2015). The variety of terrains includes smooth, mottled, pitted, and brittle terrains as well as terrains with exposed consolidated materials.…”

Section: Introductionmentioning

confidence: 97%

Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations

Auger

Groussin

Jordá

et al. 2015

A&A

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Context. Since August 2014, the OSIRIS Narrow Angle Camera (NAC) onboard the Rosetta spacecraft has acquired high spatial resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko, down to the decimeter scale. This paper focuses on the Imhotep region, located on the largest lobe of the nucleus, near the equator. Aims. We map, inventory, and describe the geomorphology of the Imhotep region. We propose and discuss some processes to explain the formation and ongoing evolution of this region. Methods. We used OSIRIS NAC images, gravitational heights and slopes, and digital terrain models to map and measure the morphologies of Imhotep. Results. The Imhotep region presents a wide variety of terrains and morphologies: smooth and rocky terrains, bright areas, linear features, roundish features, and boulders. Gravity processes such as mass wasting and collapse play a significant role in the geomorphological evolution of this region. Cometary processes initiate erosion and are responsible for the formation of degassing conduits that are revealed by elevated roundish features on the surface. We also propose a scenario for the formation and evolution of the Imhotep region; this implies the presence of large primordial voids inside the nucleus, resulting from its formation process.

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Section: Introductionmentioning

confidence: 97%

Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations

Auger

Groussin

Jordá

et al. 2015

A&A

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“…Deep Space 1 reached the comet 19P/Borrelly in 2001 and returned images with a maximum spatial scale of 47 m pixel -1 . This scale factor allowed the detection of different types of terrains on the basis of topography, morphology and albedo which were classified as dark spots, mottled terrain, mesas and smooth terrain (Britt et al 2004). Features such as ridges, troughs, pits and hills have also been detected.…”

mentioning

confidence: 99%

“…Features such as ridges, troughs, pits and hills have also been detected. Terrain units and features have been interpreted to be the different expressions of erosion by sublimation (Britt et al 2004).…”

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confidence: 99%

Geologic mapping of the Comet 67P/Churyumov–Gerasimenko's Northern hemisphere

Giacomini

Massironi

El‐Maarry

et al. 2016

Mon. Not. R. Astron. Soc.

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The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS), the scientific imaging system onboard the Rosetta mission, has been acquiring images of the nucleus of the comet 67P/Churyumov-Gerasimenko since 2014 August with a resolution which allows a detailed analysis of its surface. Indeed, data reveal a complex surface morphology which is likely the expression of different processes which occurred at different times on the cometary nucleus. In order to characterize these different morphologies and better understand their distribution, we performed a geologic mapping of comet's 67P Northern hemisphere in which features have been distinguished based on their morphological, textural and stratigraphic characteristics. For this purpose, we used narrow-angle camera images acquired in 2014 August and September with a spatial scale ranging from 1.2 to 2.4 m pixel -1 . Several different geologic units have been identified on the basis of their different surface textures, granulometry and morphology. Some of these units are distinctive and localized, whereas others are more common and distributed all over the Northern hemisphere. Moreover, different types of linear features have been distinguished on the basis of their morphology. Some of these lineaments have never been observed before on a comet and can offer important clues on the internal structures of the nucleus itself. The geologic mapping results presented here will allow us to better understand the processes which affected the nucleus' surface and thus the origin and evolutionary history of comet 67P/Churyumov-Gerasimenko.

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“…The collision may play a role to trigger off the formation of active regions on the surface. Britt et al (2004) and Basilevsky and Keller (2006) proposed that the formation of depression feature, which can be formed by impacts, is an important process on the surface of T1 to sublime the material below a dust mantle.…”

Section: Mass Loss Of Surface Materials From T1 Due To Impacts Of Astmentioning

confidence: 99%

Collisional process on Comet 9/P Tempel 1: Mass loss of its dust and ice by impacts of asteroidal objects and its collisional history

et al. 2010

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We have studied the collisional process on the nucleus of Comet 9/P Tempel 1 (T1) and estimated the mass loss of surface materials due to the impacts of asteroidal objects. The mass loss rate is around ∼2×10 5 kg yr −1 , which is smaller than that of water sublimation of ∼6×10 9 kg yr −1 . We then estimated the number density of craters formed by asteroid impacts to infer the collisional history of T1. We found that the time necessary to accumulate the crater population on T1 is as long as ∼ a few 10 4 years, suggesting that T1 crossed the asteroid belt region more than ∼ a few 10 4 years ago, though this estimated time may be reduced to several thousands of years by taking into account the influence of the sublimation process on the crater size. Alternatively, the total period of the recent orbit, in which the perihelion distance is small enough to cause significant sublimation by erasing a large number of small craters, may be less than ∼2×10 3 years.

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The morphology and surface processes of Comet 19/P Borrelly

Cited by 98 publications

References 15 publications

Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations

Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations

Geologic mapping of the Comet 67P/Churyumov–Gerasimenko's Northern hemisphere

Collisional process on Comet 9/P Tempel 1: Mass loss of its dust and ice by impacts of asteroidal objects and its collisional history

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