SwePub
Sök i LIBRIS databas

  Utökad sökning

onr:"swepub:oai:DiVA.org:uu-302673"
 

Sökning: onr:"swepub:oai:DiVA.org:uu-302673" > The global shape, d...

The global shape, density and rotation of Comet 67P/Churyumov-Gerasimenko from preperihelion Rosetta/OSIRIS observations

Jorda, L. (författare)
Univ Aix Marseille, Lab Astrophys Marseille, UMR7326, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Gaskell, R. (författare)
Planetary Sci Inst, 1700 East Ft Lowell,Suite 106, Tucson, AZ 85719 USA.
Capanna, C. (författare)
Univ Aix Marseille, Lab Astrophys Marseille, UMR7326, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
visa fler...
Hviid, S. (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany.
Lamy, P. (författare)
Univ Aix Marseille, Lab Astrophys Marseille, UMR7326, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Durech, J. (författare)
Charles Univ Prague, Fac Math & Phys, Astron Inst, V Holesovickch 2, CR-18000 Prague, Czech Republic.
Faury, G. (författare)
AKKA Technol, 6 Rue Roger Camboulives, F-31100 Toulouse, France.
Groussin, O. (författare)
Univ Aix Marseille, Lab Astrophys Marseille, UMR7326, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Gutierrez, P. (författare)
CSIC, Inst Astrofis Andalucia, Aptd 3004, E-18080 Granada, Spain.
Jackman, C. (författare)
KinetX Aerosp Inc, 21 W Easy St, Simi Valley, CA 93065 USA.
Keihm, S. J. (författare)
CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA.
Keller, H. U. (författare)
Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.
Knollenberg, J. (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany.
Kuehrt, E. (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany.
Marchi, S. (författare)
Southwest Res Inst, 1050 Walnut St, Boulder, CO 80302 USA.
Mottola, S. (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany.
Palmer, E. (författare)
Planetary Sci Inst, 1700 East Ft Lowell,Suite 106, Tucson, AZ 85719 USA.
Schloerb, F. P. (författare)
Univ Massachusetts, 619 Lederle Grad Res Tower, Amherst, MA 01003 USA.
Sierks, H. (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Vincent, J. -B (författare)
A'Hearn, M. F. (författare)
Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
Barbieri, C. (författare)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Rodrigo, R. (författare)
CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain.;Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland.
Koschny, D. (författare)
ESA RSSD, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk, Netherlands.
Rickman, Hans (författare)
Uppsala universitet,Teoretisk astrofysik,PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland.
Barucci, M. A. (författare)
Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Obs Paris, 5 Pl J Janssen, F-92195 Meudon, France.
Bertaux, J. L. (författare)
CNRS UVSQ IPSL, LATMOS, 11 Blvd Alembert, F-78280 Guyancourt, France.
Bertini, I. (författare)
Univ Padua, Ctr Ateneo Studi & Attivita Spaziali Giuseppe Col, Via Venezia 15, I-35131 Padua, Italy.
Cremonese, G. (författare)
Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy.
Da Deppo, V. (författare)
CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.
Davidsson, B. (författare)
PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland.
Debei, S. (författare)
Univ Padua, Dept Ind Engn, Via Venezia 1, I-35131 Padua, Italy.
De Cecco, M. (författare)
Univ Trento, Via Mesiano 77, I-38100 Trento, Italy.
Fornasier, S. (författare)
Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Obs Paris, 5 Pl J Janssen, F-92195 Meudon, France.
Fulle, M. (författare)
INAF, Osservatorio Astron, Via Tiepolo 11, I-34014 Trieste, Italy.
Guettler, C. (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Ip, W. -H (författare)
Natl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan
Kramm, J. R. (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Kueppers, M. (författare)
ESA ESAC, POB 78, Villanueva De La Caliada 28691, Spain.
Lara, L. M. (författare)
CSIC, Inst Astrofis Andalucia, Aptd 3004, E-18080 Granada, Spain.
Lazzarin, M. (författare)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Lopez Moreno, J. J. (författare)
CSIC, Inst Astrofis Andalucia, Aptd 3004, E-18080 Granada, Spain.
Marzari, F. (författare)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Naletto, G. (författare)
Univ Padua, Ctr Ateneo Studi & Attivita Spaziali Giuseppe Col, Via Venezia 15, I-35131 Padua, Italy.;CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.;Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy.
Oklay, N. (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Thomas, N. (författare)
Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
Tubiana, C. (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Wenzel, K-P (författare)
ESA SSO, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk, Netherlands
visa färre...
Univ Aix Marseille, Lab Astrophys Marseille, UMR7326, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France Planetary Sci Inst, 1700 East Ft Lowell,Suite 106, Tucson, AZ 85719 USA. (creator_code:org_t)
2016
2016
Engelska.
Ingår i: Icarus (New York, N.Y. 1962). - 0019-1035 .- 1090-2643. ; 277, s. 257-278
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • The Rosetta spacecraft reached Comet 67P/Churyumov-Gerasimenko (hereafter 67P/C-G) in August 2014 at an heliocentric distance of 3.6 a.u. and was then put in orbit around its nucleus to perform detailed observations. Among the collected data are the images acquired by the OSIRIS instrument up to the perihelion passage of the comet in August 2015, which allowed us to map the entire nucleus surface at high-resolution in the visible. Stereophotoclinometry methods have been used to reconstruct a global high-resolution shape model and to monitor its rotational parameters using data collected up to perihelion. The nucleus has a conspicuous bilobate shape with overall dimensions along its principal axes of (4.34 +/- 0.02) x (2.60 +/- 0.02) x (2.12 +/- 0.06) km. The best-fit ellipsoid dimensions of the individual lobes along their principal axes of inertia are found to be 4.10 x 3.52 x 1.63 km and 2.50 x 2.14 x 1.641cm. Their volume amounts to 66% and 27% of the total volume of the nucleus. The two lobes are connected by a "neck" whose volume has been estimated to represent similar to 7% of the total volume of the comet. Combining the derived volume of 18.8 +/- 0.3 km(3) with the mass of 9.982 +/- 0.003 x 10(12) kg determined by the Rosetta/RSI experiment, we obtained a bulk density of the nucleus of 532 +/- 7 kg m(-3). Together with the companion value of 535 35 kg m-3 deduced from the stereophotogrammetry shape model of the nucleus (Preusker et al. [2015] Astron. Astrophys. 583, A33), these constitute the first reliable and most accurate determination of the density of a cometary nucleus to date. The calculated porosity is quite large, ranging approximately from 70% to 75% depending upon the assumed density of the dust grains and the dust-to-ice mass ratio. The nature of the porosity, either micro or macro or both, remains unconstrained. The coordinates of the center of gravity are not compatible with a uniform nucleus density. The direction of the offset between the center of gravity and the center of figure suggests that the big lobe has a slightly higher bulk density compared to the small one. the center of mass position cannot be explained by different, but homogenous densities in the two lobes. The initial rotational period of 12.4041 +/- 0.0001 h of the nucleus persisted until October 2014. It then slightly increased to a maximum of 12.4304h reached on 19 May 2015 and finally dropped to 12.305 h just before perihelion on August 10, 2015. A periodogram analysis of the (RA, Dec) direction of the Z-axis of the comet obtained in parallel with the shape reconstruction exhibits a highly significant minima at 11.5 +/- 0.5 day clearly indicating an excited rotational state with an amplitude of 0.15 +/- 0.03 degrees.

Ämnesord

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Comets
nucleus
Comets
dynamics
Comets
origin
Image processing
Data reduction techniques

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

Hitta via bibliotek

Till lärosätets databas

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy