Results 51 to 60 of about 15,403 (216)

Dynamics, Origin, and Activation of Main Belt Comets [PDF]

, 2009
The discovery of Main Belt Comets (MBCs) has raised many questions regarding the origin and activation mechanism of these objects. Results of a study of the dynamics of these bodies suggest that MBCs were formed in-situ as the remnants of the break-up of
Haghighipour, Hsieh, Nader Haghighipour, Nesvorný   +3 more
core   +1 more source

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

Mass, Density, and Radius of Asteroid (16) Psyche from High-precision Astrometry

The Astronomical Journal
We characterize asteroid (16) Psyche using high-precision astrometry, including the recent Gaia Focused Product Release. The gravitational perturbations of Psyche on other asteroids can be observable in the case of mutual encounters.
Davide Farnocchia, Oscar Fuentes-Muñoz, Ryan S. Park, James Baer, Steven R. Chesley   +4 more
doaj   +1 more source

Active Asteroids: Main-Belt Comets and Disrupted Asteroids [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractThe study of active asteroids has attracted a great deal of interest in recent years since the recognition of main-belt comets (which orbit in the main asteroid belt, but exhibit comet-like activity due to the sublimation of volatile ices) as a new class of comets in 2006, and the discovery of the first disrupted asteroids (which, unlike MBCs ...
openaire   +2 more sources

A Panspermia Origin for Venus Cloud Life

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Decades of study have hinted at the astrobiological potential of Venus's cloud layers. This potential is often cast as stemming from the idea that the Venusian surface was clement in the past. As the climate changed, life then remained in, or perhaps evolved and migrated to, the last habitable niche: the altitudes above ∼50 km with Earth‐like ...
E. Guinan, T. J. Austin, J. G. O’Rourke, N. G. Izenberg, E. A. Silber, E. Trembath‐Reichert   +5 more
wiley   +1 more source

A photometric search for active Main Belt asteroids

, 2014
It is well known that some Main Belt asteroids show comet-like features. A representative example is the first known Main Belt comet 133P/(7968) Elst-Pizarro. If the mechanisms causing this activity are too weak to develop visually evident comae or tails,
Cikota, A., Cikota, S., Morales, N., Ortiz, J. L., Tancredi, G.   +4 more
core   +1 more source

The impact of main belt asteroids on infrared--submillimetre photometry and source counts [PDF]

, 2007
> Among the components of the infrared and submillimetre sky background, the closest layer is the thermal emission of dust particles and minor bodies in the Solar System.
A. Pál, Belton, Cs. Kiss, Fazio, Harris, Jeong, Jeong, Kenyon, Kiss, Kiss, Lagache, Lagache, Lebofsky, Meadows, Müller, Negrello, P. Ábrahám, Pilbratt, Rieke, Roques, T. G. Müller, Tauber, Tedesco, Tedesco, Werner, Ábrahám   +25 more
core   +2 more sources

The Efficient Delivery of Highly Siderophile Elements to the Core Creates a Mass Accretion Catastrophe for the Earth

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract The excess abundance of highly siderophile elements (HSEs), as inferred for the terrestrial planets and the Moon, is thought to record a “late veneer” of impacts after the giant impact phase of planet formation. Estimates for total mass accretion during this period typically assume all HSEs delivered remain entrained in the mantle.
Richard J. Anslow, Maylis Landeau, Amy Bonsor, Jonathan Itcovitz, Oliver Shorttle   +4 more
wiley   +1 more source

JWST Spectroscopy of (142) Polana: Connection to NEAs (101955) Bennu and (162173) Ryugu

The Planetary Science Journal
The new Polana collisional family is the hypothesized origin of the near-Earth asteroids (101955) Bennu, which was the target of the NASA OSIRIS-REx mission, and (162173) Ryugu, which was the target of the JAXA Hayabusa2 mission.
Anicia Arredondo, Tracy M. Becker, Maggie M. McAdam, Andrew S. Rivkin, Stephanie Jarmak, Ian Wong   +5 more
doaj   +1 more source

Gaia and IRTF abundance of A-type main-belt asteroids

Astronomy & Astrophysics
Context. The so-called missing-mantle problem is a long-standing issue in planetary science. It states that olivine-rich asteroids should be abundant in the main belt, while this is observationally found not to be the case by dedicated surveys ...
Delbo M., Avdellidou C., Galinier M., Bhat U., Dyer T., Bolin B. T., Galluccio L.   +6 more
doaj   +1 more source