Results 111 to 120 of about 15,403 (216)
Brownian Motion of Main-belt Asteroids on Human Timescales
The Planetary Science JournalHigh-precision astrometric data on main-belt asteroids (MBAs) enable new inferences on the gravitational and nongravitational forces present in this region.
Gary M. Bernstein
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Narrow band photometry of selected asteroids [PDF]
The CCD photometry of selected asteroids was carried out to check for possible cometary activity in them. To distinguish the asteroids with possible cometary activity from those of the main belt, each object of interest was observed in two filters; one ...
Bhargavi, S. G., Rajamohan, R.
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Testing the Icy Pebble Accretion Hypothesis with Primordial Main-belt Asteroids
The Astrophysical JournalLarge main-belt asteroids (diameter D ≳ 120 km) exhibit a surface composition gradient as a function of heliocentric distance, ranging from anhydrous bodies to those rich in hydrated and, possibly, ammoniated materials. Their primordial nature holds key
Jinfei Yu +2 more
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The Lifetime of Ice on Main Belt Asteroids
The Astrophysical Journal, 2008 We theoretically estimate the loss rate of buried ice from spherical bodies 2-3.3 AU from the Sun. The loss rate is explored as a function of about a dozen parameters. We introduce the concept of a "buried snow line," where the loss of ice is sufficiently slow over the age of the solar system.
openaire +1 more source
Three Fast-spinning Medium-sized Hilda Asteroids Uncovered by TESS
The Astrophysical Journal LettersHilda asteroids, which orbit in a 3:2 resonance with Jupiter, serve as key indicators of dynamical processes in the early solar system. Their spin rates, an important probe of these mechanisms, can constrain their density and collisional evolution ...
Nóra Takács +10 more
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3 μm Phase Curves of Main-belt Asteroids from NEOWISE Photometry
The Planetary Science JournalThe shapes of asteroid phase curves are influenced by the physical properties of asteroid surfaces. The variation of an asteroid’s brightness as a function of the solar phase angle can tell us about surface properties such as grain size distribution ...
Matthew Varakian +3 more
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Occultation-based Size and Shape of (269) Justitia
The Planetary Science JournalWe present results from an occultation of a star by the asteroid (269) Justitia on 2023 August 31 UT using a deployment of 34 stations. Of the deployed stations, 29 were successful in collecting useful data and 19 recorded a positive occultation event ...
Marc W. Buie +34 more
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Earth-Approaching Asteroids as Targets for Exploration [PDF]
A mission strategy focused on the earth approaching asteroids is presented. The opportunities for sample return and manned visits favor the closer Apollos and Amors over the main belt ...
Helin, E. F., Shoemaker, E. M.
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Precise Orbit Determination of Mars-crossing Asteroids
The Astronomical JournalThis study investigates the orbit determination of the Mars-crossing asteroids (MCAs) with a focus on the possibility of detecting their Yarkovsky signals. We analyze the influences of force model uncertainties on MCA orbits, including the uncertainty of
Xin Liu +6 more
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Surface Ages for the Sample Return Asteroids Bennu, Ryugu, and Itokawa
The Planetary Science JournalThe OSIRIS-REx, Hayabusa2, and Hayabusa missions have returned samples from three near-Earth asteroids (NEAs), namely Bennu, Ryugu, and Itokawa, respectively.
William F. Bottke +8 more
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