Jupiter family comets in near-Earth orbits: Are some of them interlopers from the asteroid belt?

Fernández, Julio A.; Sosa, Andrea

doi:10.1016/j.pss.2015.07.010

Cited by 37 publications

(68 citation statements)

References 41 publications

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“…Thus, the object is unpredictable on relatively short timescales compared to other small bodies in the Solar System. This is to be expected for an object on a JFC-like orbit that originated from the trans-Neptunian region [Fernández and Sosa, 2015]. As seen in Fig.…”

Section: Short-term Simulationssupporting

confidence: 57%

“…Traditionally, the MBOs were considered asteroidal and inner Solar System in origin, and NEOs primarily evolved from the MBO space after entering an orbital resonance [Bottke Jr et al, 2002, Granvik et al, 2018. However, with the identifications of Main-Belt Comets (MBCs) [Hsieh and Jewitt, 2006] and dry asteroidal material in the Kuiper Belt [Meech et al, 2016], we have realized that the material in the Solar System is more mixed than previously believed [Fernández and Sosa, 2015]. Additionally, the starkly drawn lines between asteroidal and cometary material have since faded with the identification of active asteroids, extinct comets, and mixing between populations [Fernández et al, 2001, Kim et al, 2014, Jewitt, 2012.…”

Section: Small Inner Solar System Bodiesmentioning

confidence: 99%

“…This is likely due to the initial post-grazing orbit, which has an aphelion very near the orbit of Jupiter. However, bodies in JFC orbits that display cometary features are more likely to have multiple ≤ 0.1 AU encounters with Jupiter, reducing the orbital stability compared to asteroidal interlopers within the population [Fernández and Sosa, 2015]. Therefore, the JFC-orbit dynamical lifetime for the meteoroid is indistinguishable from a JFC from a more "traditional" source region.…”

Section: Long-term Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Where Did They Come From, Where Did They Go: Grazing Fireballs

Shober

Jansen‐Sturgeon

Sansom

et al. 2020

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For centuries extremely-long grazing fireball displays have fascinated observers and inspired people to ponder about their origins. The Desert Fireball Network (DFN) is the largest single fireball network in the world, covering about one third of Australian skies. This expansive size has enabled us to capture a majority of the atmospheric trajectory of a spectacular grazing event that lasted over 90 seconds, penetrated as deep as ∼ 58.5 km, and traveled over 1,300 km through the atmosphere before exiting back into interplanetary space. Based on our triangulation and dynamic analyses of the event, we have estimated the initial mass to be at least 60 kg, which would correspond to a 30 cm object given a chondritic density (3500 kg m −3 ). However, this initial mass estimate is likely a lower bound, considering the minimal deceleration observed in the luminous phase. The most intriguing quality of this close encounter is that the meteoroid originated from an Apollo-type orbit and was inserted into a Jupiter-family comet (JFC) orbit due to the net energy gained during the close encounter with the Earth. Based on numerical simulations, the meteoroid will likely spend ∼ 200 kyrs on a JFC orbit and have numerous encounters with Jupiter, the first of which will occur in January-March 2025. Eventually the meteoroid will likely be ejected from the Solar System or be flung into a trans-Neptunian orbit.

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Section: Short-term Simulationssupporting

confidence: 57%

Section: Small Inner Solar System Bodiesmentioning

confidence: 99%

Section: Long-term Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Where Did They Come From, Where Did They Go: Grazing Fireballs

Shober

Jansen‐Sturgeon

Sansom

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, they also showed that such implanted objects would not be stable for more than 100 Myr. These dynamical pathways appear to work both ways, with a non-negligible possibility that some JFCs could originate from the MB (Fernández and Sosa 2015).…”

Section: Dynamical Evolutionmentioning

confidence: 99%

The Main Belt Comets and ice in the Solar System

Snodgrass

Agarwal

Combi

et al. 2017

Astron Astrophys Rev

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We review the evidence for buried ice in the asteroid belt; specifically the questions around the so-called Main Belt Comets (MBCs). We summarise the evidence for water throughout the Solar System, and describe the various methods for detecting it, including remote sensing from ultraviolet to radio wavelengths. We review progress in the first decade of study of MBCs, including observations, modelling of ice survival, and discussion on their origins. We then look at which methods will likely be most effective for further progress, including the key challenge of direct detection of (escaping) water in these bodies.

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“…For reference, an additional ∼500 currently inactive asteroids with dynamically JFC-like orbits within this semimajor axis range are also catalogued by JPL. Notably, 210P/Christensen is the only active JFC among these objects that overlaps with the list of JFCs with potential asteroidal origins identified by Fernández & Sosa (2015). Given that we cannot say how many of the Themis family objects found to evolve onto JFC-like orbits in our integrations will actually become active and for how long from our dynamical results alone (Section 3.2), we emphasize that we cannot currently say whether any known JFCs may actually be from the Themis family or how many active JFCs with Themis family origins that we should expect to find in general at any given time.…”

Section: Implications For Currently Known Jfcsmentioning

confidence: 89%

Potential Themis-family Asteroid Contribution to the Jupiter-family Comet Population

Hsieh

Novaković

Walsh

et al. 2020

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Recent dynamical analyses suggest that some Jupiter family comets (JFCs) may originate in the main asteroid belt instead of the outer solar system. This possibility is particularly interesting given evidence that icy main-belt objects are known to be present in the Themis asteroid family. We report results from dynamical analyses specifically investigating the possibility that icy Themis family members could contribute to the observed population of JFCs. Numerical integrations show that such dynamical evolution is indeed possible via a combination of eccentricity excitation apparently driven by the nearby 2:1 mean-motion resonance with Jupiter, gravitational interactions with planets other than Jupiter, and the Yarkovsky effect. We estimate that, at any given time, there may be tens of objects from the Themis family on JFC-like orbits with the potential to mimic active JFCs from the outer solar system, although not all, or even any, may necessarily be observably active. We find that dynamically evolved Themis family objects on JFC-like orbits have semimajor axes between 3.15 au and 3.40 au for the vast majority of their time on such orbits, consistent with the strong role that the 2:1 mean-motion resonance with Jupiter likely plays in their dynamical evolution. We conclude that a contribution from the Themis family to the active JFC population is plausible, although further work is needed to better characterize this contribution.

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Jupiter family comets in near-Earth orbits: Are some of them interlopers from the asteroid belt?

Cited by 37 publications

References 41 publications

Where Did They Come From, Where Did They Go: Grazing Fireballs

Where Did They Come From, Where Did They Go: Grazing Fireballs

The Main Belt Comets and ice in the Solar System

Potential Themis-family Asteroid Contribution to the Jupiter-family Comet Population

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