Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Comet nuclei"'
Autor:
Mingming Zhang, Michael E. Zolensky, Kohei Fukuda, Daisuke Nakashima, Michael K. Weisberg, Noriko T. Kita
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 12 (2024)
Comet 81P/Wild 2 is a ∼4.5 km-sized primordial object that almost has not been modified by internal heating by ^26 Al decay. Its nucleus could have been formed by hierarchical agglomeration or gravitational collapse of pebble swarms concentrated by
Externí odkaz:
https://doaj.org/article/3749b5a3d4af41c6b67fefad4a399fb8
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 7, p 162 (2024)
The Legacy Survey of Space and Time (LSST) at Vera C. Rubin Observatory will deliver high-quality, temporally sparse observations of millions of solar system objects on an unprecedented scale. Such data sets will likely enable the precise estimation
Externí odkaz:
https://doaj.org/article/5e219bc96330490e98656bfb5283c8aa
Autor:
Mohammad Saki, Dennis Bodewits, Boncho P. Bonev, Neil Dello Russo, Adrienn Luspay-Kuti, John W. Noonan, Michael. R. Combi, Yinsi Shou
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 3, p 70 (2024)
Comets, as remnants of the solar system’s formation, vary in volatile-refractory content. In situ comet studies, such as the Rosetta mission to 67P/Churyumov–Gerasimenko, provide detailed volatile composition insights, while ground-based studies
Externí odkaz:
https://doaj.org/article/613f6d90664642d29940df6654915879
Autor:
Aurélie Guilbert-Lepoutre, Selma Benseguane, Laurine Martinien, Jérémie Lasue, Sébastien Besse, Björn Grieger, Arnaud Beth
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 11, p 220 (2023)
Large and deep depressions, also known as pits, are observed at the surface of all Jupiter-family comets (JFCs) imaged by spacecraft missions. They offer the opportunity to glimpse the subsurface characteristics of comet nuclei and study the complex
Externí odkaz:
https://doaj.org/article/cb8616081b3e4af7840cb75a4fbfcc69
Autor:
Hideyo Kawakita, Neil Dello Russo, Ronald J. Vervack Jr., Michael A. DiSanti, Boncho P. Bonev, Hitomi Kobayashi, Daniel C. Boice, Yoshiharu Shinnaka
Publikováno v:
The Astronomical Journal, Vol 166, Iss 5, p 207 (2023)
Ammonia (NH _3 ), likely the most abundant nitrogen-bearing molecule in cometary ices followed by hydrogen cyanide, is believed to be stored in the nucleus predominantly as a parent ice. However, spatial profiles of NH _3 observed in comet C/2014 Q2
Externí odkaz:
https://doaj.org/article/d2fed5de8e9b4255bac4f832b065d3a6
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 5, p 85 (2023)
The release of volatiles from comets is usually from direct sublimation of ices on the nucleus, but for very or hyperactive comets other sources have to be considered to account for the total production rates. In this work, we present new near-IR (NI
Externí odkaz:
https://doaj.org/article/fd9e36d51ce9484fa5d3ad8c4c3c5f10
Publikováno v:
The Astrophysical Journal, Vol 942, Iss 2, p 92 (2023)
It was recently proposed that there exists a “gateway” in the orbital parameter space through which Centaurs transition to Jupiter-family comets (JFCs). Further studies have implied that the majority of objects that eventually evolve into JFCs sh
Externí odkaz:
https://doaj.org/article/70916d185b7840faba226d0ab98eec56
Publikováno v:
The Astronomical Journal, Vol 165, Iss 2, p 67 (2023)
One of the common approximations in long-term evolution studies of small bodies is the use of circular orbits averaging the actual eccentric ones, facilitating the coupling of processes with very different timescales, such as the orbital changes and
Externí odkaz:
https://doaj.org/article/186362093447492884d7284ca728e1ec
Publikováno v:
The Astronomical Journal, Vol 165, Iss 3, p 122 (2023)
We present imaging observations of the disintegrating long-period comet C/2021 A1 (Leonard). High-resolution observations with the Hubble Space Telescope show no evidence for surviving fragments, and place a 3 σ upper limit on their possible radius
Externí odkaz:
https://doaj.org/article/158ff720481442479c19561d648255ca
Autor:
Erica Bufanda, Karen J. Meech, Jan T. Kleyna, Olivier R. Hainaut, James M. Bauer, Haynes Stephens, Peter Veres, Marco Micheli, Jacqueline V. Keane, Robert Weryk, Richard Wainscoat, Devendra K. Sahu, Bhuwan C. Bhatt
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 1, p 2 (2023)
The perihelion of the trans-Neptunian object (TNO) 2009 MS9 brings it close to the distance where some long-period comets are seen to become active. Knowing this, and the fact that this object appears to brighten in excess of its predicted nucleus br
Externí odkaz:
https://doaj.org/article/64294d4381054f19ac7bcf7540c48491