Results 61 to 70 of about 681,612 (216)

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Constraints from Comets on the Formation and Volatile Acquisition of the Planets and Satellites [PDF]

Space Science Reviews, 2015
Comets play a dual role in understanding the formation and evolution of the solar system. First, the composition of comets provides information about the origin of the giant planets and their moons because comets formed early and their composition is not expected to have evolved significantly since formation.
Mandt, K. E., Mousis, O., Marty, B., Cavalié, T., Harris, W., Hartogh, P., Willacy, K.   +6 more
openaire   +4 more sources

X‐ray computed tomography study of terrestrial analog cores in preparation for Mars sample return

Meteoritics &Planetary Science, EarlyView.
Abstract Mars Sample Return (MSR) is expected to transform planetary science by providing unprecedented access to pristine Martian material. Initial characterization in the sample receiving facility (SRF) will rely on nondestructive techniques such as X‐ray computed tomography (XCT) to document the condition, distribution, and internal features of ...
Sophie Benaroya, Christopher D. K. Herd, David T. Flannery, Nicolas Randazzo   +3 more
wiley   +1 more source

The Composition of Comet C/2012 K1 (PanSTARRS) and the Distribution of Primary Volatile Abundances Among Comets

The Astronomical Journal, 2017
Abstract On 2014 May 22 and 24 we characterized the volatile composition of the dynamically new Oort cloud comet C/2012 K1 (PanSTARRS) using the long-slit, high resolution (λ/Δλ ≈ 25,000) near-infrared echelle spectrograph (NIRSPEC) at the 10 m Keck II telescope on Maunakea, Hawaii.
Nathan X. Roth, Erika L. Gibb, Boncho P. Bonev, Michael A. DiSanti, Michael J. Mumma, Geronimo L. Villanueva, Lucas Paganini   +6 more
openaire   +1 more source

Boulder Migration in the Khonsu Region of Comet 67P/Churyumov–Gerasimenko

The Astrophysical Journal
The European Space Agency's Rosetta mission is the only space mission that has performed long-term monitoring of a comet at close distances. For over two years, Rosetta rendezvoused with comet 67P/Churyumov–Gerasimenko, which revealed diverse ...
Xiang Tang, Xian Shi, Mohamed Ramy El-Maarry   +2 more
doaj   +1 more source

Small‐scale elemental abundance variations in Ryugu particles from touchdown 1

Meteoritics &Planetary Science, EarlyView.
Abstract Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...
Karina López García, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai   +6 more
wiley   +1 more source

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

The Astrophysical Journal Letters
Ejection of large boulder-like debris is a vigorous form of cometary activity that is unlikely induced by water ice out-gassing alone but rather associated with the sublimation of super-volatile ices.
Xian Shi, Xuanyu Hu, Jessica Agarwal, Carsten Güttler, Martin Rose, Horst Uwe Keller, Marco Fulle, Jakob Deller, Holger Sierks   +8 more
doaj   +1 more source

Early Stages of Galilean Moon Formation in a Water-depleted Environment

The Astrophysical Journal Letters, 2023
A key feature of the Galilean satellite system is its monotonic decrease in bulk density with growing distance from Jupiter, indicating an ice mass fraction that is zero in the innermost moon Io and about half in the outer moons Ganymede and Callisto ...
Olivier Mousis, A. Schneeberger, Jonathan I. Lunine, Christopher R. Glein, Alexis Bouquet, Steven D. Vance   +5 more
doaj   +1 more source

Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images [PDF]

Astronomy & Astrophysics, 2019
Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox.
S. Fornasier, C. Feller, P. Hasselmann, M. Barucci, J. Sunshine, J. Vincent, Xian Shi, H. Sierks, G. Naletto, P. Lamy, R. Rodrigo, R. Rodrigo, D. Koschny, B. Davidsson, J. Bertaux, I. Bertini, D. Bodewits, G. Cremonese, V. Deppo, S. Debei, M. Cecco, J. Deller, S. Ferrari, M. Fulle, P. Gutiérrez, C. Güttler, W. Ip, L. Jorda, H. Keller, L. Lara, M. Lazzarin, J. Lopez‐Moreno, A. Lucchetti, F. Marzari, S. Mottola, M. Pajola, I. Tóth, C. Tubiana   +37 more
semanticscholar   +1 more source

Activity of Halley-type Comets 12P/Pons–Brooks and 13P/Olbers from SOHO/SWAN Observations

The Planetary Science Journal
The Solar Wind ANisotropies (SWAN) all-sky hydrogen Ly α camera on the Solar and Heliosphere Observatory (SOHO) observed the hydrogen coma of Halley-type comet (HTC) 12P/Pons–Brooks from SOHO’s halo orbit around L1 throughout its 2023–2024 apparition ...
M. R. Combi, T. Mäkinen, J.-L. Bertaux, E. Quémerais, S. Ferron   +4 more
doaj   +1 more source