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  • Pajola, MaurizioNASA, Ames Res Ctr, Moffett Field, CA 94035 USA.;Univ Padua, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy. (author)

The southern hemisphere of 67P/Churyumov-Gerasimenko : Analysis of the preperihelion size-frequency distribution of boulders >= 7m

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-07-14
  • EDP Sciences,2016
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-308790
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308790URI
  • https://doi.org/10.1051/0004-6361/201628887DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Aims. We calculate the size-frequency distribution of the boulders on the southern hemisphere of comet 67P Churyumov-Gerasimenko (67P), which was in shadow before the end of April 2015. We compare the new results with those derived from the northern hemisphere and equatorial regions of 67P, highlighting the possible physical processes that lead to these boulder size distributions. Methods. We used images acquired by the OSIRIS Narrow Angle Camera (NAC) on 2 May 2015 at a distance of 125 km from the nucleus. The scale of this dataset is 2.3 m/px; the high resolution of the images, coupled with the favorable observation phase angle of 62 degrees, provided the possibility to unambiguously identify boulders >= 7 m on the surface of 67P and to manually extract them with the software ArcGIS. We derived the size-frequency distribution of the illuminated southern hemisphere. Results. We found a power-law index of -3.6 +/- 0.2 for the boulders on the southern hemisphere with a diameter range of 7-35 m. The power-law index is equal to the one previously found on northern and equatorial regions of 67P, suggesting that similar boulder formation processes occur in both hemispheres. The power-law index is related to gravitational events triggered by sublimation and/or thermal fracturing causing regressive erosion. In addition, the presence of a larger number of boulders per km(2) in the southern hemisphere, which is a factor of 3 higher with respect to the northern hemisphere, suggests that the southernmost terrains of 67P are affected by a stronger thermal fracturing and sublimating activity, hence possibly causing larger regressive erosion and gravitational events.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Lucchetti, AliceINAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy. (author)
  • Vincent, Jean-BaptisteMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Oklay, NildaMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • El-Maarry, Mohamed R.Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland. (author)
  • Bertini, IvanoUniv Padua, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy. (author)
  • Naletto, GiampieroUniv Padua, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.;Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy.;CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy. (author)
  • Lazzarin, MonicaUniv Padua, Dept Phys & Astron G Galilei, Vic Osservatorio 3, I-35122 Padua, Italy. (author)
  • Massironi, MatteoUniv Padua, Dept Geosci, Via G Gradenigo 6, I-35131 Padua, Italy. (author)
  • Sierks, HolgerMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Barbieri, CesareUniv Padua, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.;Univ Padua, Dept Phys & Astron G Galilei, Vic Osservatorio 3, I-35122 Padua, Italy. (author)
  • Lamy, PhilippeAix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France. (author)
  • Rodrigo, RafaelCSIC INTA, Ctr Astrobiol, Madrid 28850, Spain.;Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland. (author)
  • Koschny, DetlefEuropean Space Res & Technol Ctr ESA, Sci Support Off, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk ZH, Netherlands. (author)
  • Rickman, HansUppsala universitet,Teoretisk astrofysik,PAS Space Reserch Ctr, Bartycka 18A, PL-00716 Warsaw, Poland.(Swepub:uu)hansrick (author)
  • Keller, Horst U.TU Braunschweig, Inst Geophys & Extraterrestrial Phys, D-38106 Braunschweig, Germany. (author)
  • Agarwal, JessicaMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • A'Hearn, Michael F.Univ Maryland, Dept Astron, College Pk, MD 20742 USA. (author)
  • Barucci, Maria A.Univ Paris Diderot, Univ Paris 06, CNRS, LESIA Observ Paris, 5 Pl J Janssen, F-92195 Meudon, France.;Univ Paris Diderot, Sorbonne Paris Cite, 4 Rue Elsa Morante, F-75205 Paris 13, France. (author)
  • Bertaux, Jean-LoupCNRS UVSQ IPSL, LATMOS, 11 Blvd Alembert, F-78280 Guyancourt, France. (author)
  • Boudreault, SteveMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Cremonese, GabrieleINAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy. (author)
  • Da Deppo, VaniaCNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy. (author)
  • Davidsson, BjornNASA, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA. (author)
  • Debei, StefanoUniv Padua, Dept Mech Engn, Via Venezia 1, I-35131 Padua, Italy. (author)
  • De Cecco, MariolinoUniv Trento, UNITN, Via Mesiano 77, I-38100 Trento, Italy. (author)
  • Deller, JakobMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Fornasier, SoniaUniv Paris Diderot, Univ Paris 06, CNRS, LESIA Observ Paris, 5 Pl J Janssen, F-92195 Meudon, France.;Univ Paris Diderot, Sorbonne Paris Cite, 4 Rue Elsa Morante, F-75205 Paris 13, France. (author)
  • Fulle, MarcoINAF, Osservatorio Astron Trieste, Via Tiepolo 11, I-34143 Trieste, Italy. (author)
  • Gicquel, AdelineMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Groussin, Olivier (author)
  • Gutierrez, Pedro J.CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain. (author)
  • Guetler, CarstenMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Hofmann, MarcMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Hoefner, SebastianMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Hviid, Stubbe F.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Ip, Wing-HuenNatl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan. (author)
  • Jorda, LaurentAix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France. (author)
  • Knollenberg, JoergDeutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Kramm, J. -RainerMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • Kuehrt, EkkehardDeutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Kuppers, MichaelESA, European Space Astron Ctr, Operat Dept, POB 78, Madrid 28691, Spain. (author)
  • La Forgia, FiorangelaUniv Padua, Dept Phys & Astron G Galilei, Vic Osservatorio 3, I-35122 Padua, Italy. (author)
  • Lara, Luisa M.CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain. (author)
  • Lee, Jui-ChiNatl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan. (author)
  • Lin, Zhong-YiNatl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan. (author)
  • Lopez Moreno, Jose J.CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain. (author)
  • Marzari, FrancescoUniv Padua, Dept Phys & Astron G Galilei, Vic Osservatorio 3, I-35122 Padua, Italy. (author)
  • Michalik, HaraldTU Braunschweig, Inst Datentech & Kommunikat Snetze, Hans Sommer Str 66, D-38106 Braunschweig, Germany. (author)
  • Mottola, StefanoDeutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Preusker, FrankDeutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Scholten, FrankDeutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany. (author)
  • Thomas, NicholasUniv Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland. (author)
  • Toth, ImreAix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France.;Hungarian Acad Sci, Observ, POB 67, H-1525 Budapest, Hungary. (author)
  • Tubiana, CeciliaMax Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (author)
  • NASA, Ames Res Ctr, Moffett Field, CA 94035 USA.;Univ Padua, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.INAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy. (creator_code:org_t)

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  • In:Astronomy and Astrophysics: EDP Sciences5920004-63611432-0746

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