The Active Asteroids

@article{Jewitt2011TheAA,
  title={The Active Asteroids},
  author={David C. Jewitt and Henry H. Hsieh and Jessica Agarwal},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2011}
}
Some asteroids eject dust, unexpectedly producing transient, comet-like comae and tails. First ascribed to the sublimation of near-surface water ice, mass losing asteroids (also called "main-belt comets") can in fact be driven by a surprising diversity of mechanisms. In this paper, we consider eleven dynamical asteroids losing mass, in nine of which the ejected material is spatially resolved. We address mechanisms for producing mass loss including rotational instability, impact ejection… Expand
Main-belt comets: sublimation-driven activity in the asteroid belt
  • H. Hsieh
  • Physics, Geology
  • Proceedings of the International Astronomical Union
  • 2015
Abstract Our knowledge of main-belt comets (MBCs), which exhibit comet-like activity likely due to the sublimation of volatile ices, yet orbit in the main asteroid belt, has increased greatly sinceExpand
Super-catastrophic disruption of asteroids at small perihelion distances
TLDR
It is found that low-albedo asteroids are more likely to be destroyed farther from the Sun, which explains the apparent excess of high- albedo near-Earth objects and suggests thatLow-al Bedrock asteroids break up more easily as a result of thermal effects. Expand
Potential Jupiter-Family Comet Contamination of the Main Asteroid Belt
Abstract We present the results of “snapshot” numerical integrations of test particles representing comet-like and asteroid-like objects in the inner Solar System aimed at investigating theExpand
Thermal fatigue as the origin of regolith on small asteroids
TLDR
It is reported that thermal fatigue, a mechanism of rock weathering and fragmentation with no subsequent ejection, is the dominant process governing regolith generation on small asteroids and that thermal fragmentation induced by the diurnal temperature variations breaks up rocks larger than a few centimetres more quickly than do micrometeoroid impacts. Expand
Sublimation-induced orbital perturbations of extrasolar active asteroids and comets: application to white dwarf systems
The metal budgets in some white dwarf (WD) atmospheres reveal that volatile-rich circumstellar bodies must both exist in extrasolar systems and survive the giant branch phases of stellar evolution.Expand
Episodes of particle ejection from the surface of the active asteroid (101955) Bennu
TLDR
The properties and behavior of particles ejected from Bennu are analyzed to determine the possible mechanisms of ejection and provide understanding of the broader population of active asteroids. Expand
CASTALIA PROPOSAL: EXPLOITING A SCIENCE MISSION FOR ASTEROID DEFLECTION
The Castalia mission aims to explore and characterize the Main Belt Comet (MBC) 133P/Elst-Pizarro. MBCs are a new class of solar system objects that span the divide between the tradition definitionExpand
Active Asteroids: Main-Belt Comets and Disrupted Asteroids
  • H. Hsieh
  • Physics, Geology
  • Proceedings of the International Astronomical Union
  • 2015
Abstract The 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-likeExpand
Localized sources of water vapour on the dwarf planet (1) Ceres
TLDR
The detection of water vapour around Ceres is reported, with at least 1026 molecules being produced per second, originating from localized sources that seem to be linked to mid-latitude regions on the surface. Expand
Landslides and Mass shedding on spinning spheroidal asteroids
Abstract Conditions for regolith landslides to occur on spinning, gravitating spheroidal asteroids and their aftermath are studied. These conditions are developed by application of classical granularExpand
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References

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The Active Asteroids
Some asteroids eject dust, unexpectedly producing transient, comet-like comae and tails. First ascribed to the sublimation of near-surface water ice, mass-losing asteroids (also called main-beltExpand
A recent disruption of the main-belt asteroid P/2010 A2
TLDR
Observations of P/2010 A2, a previously unknown inner-belt asteroid with a peculiar, comet-like morphology, are reported, concluding that it is most probably the remnant of a recent asteroidal disruption in February/March 2009, evolving slowly under the action of solar radiation pressure. Expand
LARGE PARTICLES IN ACTIVE ASTEROID P/2010 A2*
The previously unknown asteroid P/2010 A2 rose to prominence in 2010 by forming a transient, comet-like tail consisting of ejected dust. The observed dust production was interpreted as the result ofExpand
Contamination of the asteroid belt by primordial trans-Neptunian objects
TLDR
It is shown that the violent dynamical evolution of the giant-planet orbits required by the so-called Nice model leads to the insertion of primitive trans-Neptunian objects into the outer belt, implying that the observed diversity of the asteroid belt is not a direct reflection of the intrinsic compositional variation of the proto-planetary disk. Expand
Collisional Excavation of Asteroid (596) Scheila
We observed asteroid (596) Scheila and its ejecta cloud using the Swift UV–optical telescope. We obtained photometry of the nucleus and the ejecta, and for the first time measured the asteroid’sExpand
Linking the collisional history of the main asteroid belt to its dynamical excitation and depletion
Abstract The main belt is believed to have originally contained an Earth mass or more of material, enough to allow the asteroids to accrete on relatively short timescales. The present-day main belt,Expand
A collision in 2009 as the origin of the debris trail of asteroid P/2010 A2
TLDR
It is determined that this was an asteroid collision that occurred around 10 February 2009 and can be explained by an initial impact ejecting large clumps of debris that disintegrated and dispersed almost immediately. Expand
Thermal alteration of asteroids: evidence from meteorites
Abstract The world's meteorite collections contain meteorites from at least ∼27 primitive, chondritic and ∼108 partially or totally melted asteroids. Detailed studies of these meteorites have shownExpand
OPTICAL AND DYNAMICAL CHARACTERIZATION OF COMET-LIKE MAIN-BELT ASTEROID (596) SCHEILA ∗
We present observations and a dynamical analysis of the comet-like main-belt object, (596) Scheila. V-band photometry obtained on UT 2010 December 12 indicates that Scheila's dust cloud has aExpand
RECURRENT PERIHELION ACTIVITY IN (3200) PHAETHON
We present a study of planet-crossing asteroid (3200) Phaethon at three successive perihelia in 2009, 2010, and 2012, using the NASA STEREO spacecraft. Phaethon is clearly detected in 2009 and 2012,Expand
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