Assessing the physical nature of near-Earth asteroids through their dynamical histories

Fernández, Julio A.; Sosa, Andrea; Gallardo, Tabaré; Gutiérrez, Jorge N.

doi:10.1016/j.icarus.2014.04.048

Cited by 25 publications

(30 citation statements)

References 39 publications

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“…Phaethon is essentially a "rock comet" and the activity is caused by the production of small dust particles with radii ∼1 μm due to thermal fracture and decomposition cracking of hydrated minerals (not sublimation of ice). Since 2003 EH1 recently possessed similarly small perihelia (Nesluśan et al 2013a;Fernández et al 2014), thermal fracture and surface desiccation may likewise be expected. At its smallest perihelion, q ∼ 0.12 AU, we estimate surface temperatures of 800 K T 1200 K on 2003 EH1.…”

Section: Discussionmentioning

confidence: 98%

“…The semimajor axis lies close to the 2:1 mean-motion resonance with Jupiter at 3.27 AU, causing strong orbital variations that drive 2003 EH1 into a Sun-approaching dynamical state (Wiegert & Brown 2005;Nesluśan et al 2013a;Fernández et al 2014). Numerical integrations show that the perihelion distance has increased approximately linearly with time from 0.2 AU 1000 years ago to the present-day value of 1.2 AU.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical integrations show that the perihelion distance has increased approximately linearly with time from 0.2 AU 1000 years ago to the present-day value of 1.2 AU. The minimum q ∼ 0.12 AU (e ∼ 0.96) occurred only ∼1500 year ago (Nesluśan et al 2013a;Fernández et al 2014). As a result, it is reasonable to expect that the surface layers should have been devolatilized at the high temperatures reached at past perihelia, leading to the present, apparently inert state.…”

Section: Introductionmentioning

confidence: 99%

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Physical Observations of (196256) 2003 Eh1, Presumed Parent of the Quadrantid Meteoroid Stream

Kasuga

Jewitt

2015

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The near-Earth asteroid (196256) 2003 EH1 has been suggested to have a dynamical association with the Quadrantid meteoroid stream. We present photometric observations taken to investigate the physical character of this body and to explore its possible relation to the stream. We find no evidence for ongoing mass loss. A model fitted to the point-like surface brightness profile at 2.1 AU limits the fractional contribution to the integrated brightness by the near-nucleus coma to 2.5%. Assuming an albedo equal to those typical of cometary nuclei (p R = 0.04), we find that the effective nucleus radius is r e = 2.0 ± 0.2 km. Time-resolved R-band photometry can be fitted by a two-peaked light curve having a rotational period of 12.650 ± 0.033 hr. The range of the light curve, Δm R = 0.44 ± 0.01 mag, is indicative of an elongated shape having an axis ratio of ∼1.5 projected into the plane of the sky. The asteroid shows colors slightly redder than the Sun, being comparable with those of C-type asteroids. The limit to the mass loss rate set by the absence of the resolved coma is 2.5 × 10 −2 kg s −1 , corresponding to an upper limit on the fraction of the surface that could be sublimating water ice f A  10 −4 . Even if sustained over the 200-500 year dynamical age of the Quadrantid stream, the total mass loss from 2003 EH1 would be too small to supply the reported stream mass (10 13 kg), implying either that the stream has another parent or that mass loss from 2003 EH1 is episodic.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical Observations of (196256) 2003 Eh1, Presumed Parent of the Quadrantid Meteoroid Stream

Kasuga

Jewitt

2015

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“…The orbital elements of these clone particles are created based on the covariance matrix provided by JPL Small-Body Data Base which are in a Gaussian distribution within one-sigma uncertainty for each of the given orbital elements. The total integration time is 100 000 yr for each case because the average physical lifetime of shortperiod comets limited by either the buildup of a dust mantle or explosive disruption -has been derived to be only several thousand years by a number of studies (Fernández et al 2002(Fernández et al , 2014Brasser & Wang 2015). ordering is based on the following analysis of the surface erosion histories :…”

Section: Comparison Of Orbital Historiesmentioning

confidence: 99%

Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko

Lai

Lee

et al. 2016

A&A

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Aims. We aim to characterize the circular depressions of comet 67P/Churyumov-Gerasimenko and investigate whether such surface morphology of a comet nucleus is related to the cumulative sublimation effect since becoming a Jupiter family comet (JFC). Methods. The images from the Rosetta/OSIRIS science camera experiment are used to construct size frequency distributions of the circular depression structures on comet 67P and they are compared with those of the JFCs 81P/Wild 2, 9P/Tempel 1, and 103P/Hartley 2. The orbital evolutionary histories of these comets over the past 100 000 yr are analyzed statistically and compared with each other. Results. The global distribution of the circular depressions over the surface of 67P is charted and classified. Descriptions are given to the characteristics and cumulative size frequency distribution of the identified features. Orbital statistics of the JFCs visited by spacecraft are derived. Conclusions. The size frequency distribution of the circular depressions is found to have a similar power law distribution to those of 9P/Tempel 1 and 81P/Wild 2. This might imply that they could have been generated by the same process. Orbital integration calculation shows that the surface erosion histories of 81P/Wild 2, and 9P/Tempel 1 could be shorter than those of 67P, 103 P/Hartley 2 and 19P/Borrelly. From this point of view, the circular depressions could be dated back to the pre-JFC phase or the transneptunian phase of these comets. The north-south asymmetry in the distribution of the circular depressions could be associated with the heterogeneous structure of the nucleus of comet 67P and/or the solar insolation history.

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“…This evidence should not be considered as undoubted confirmation of any cometary nature of the object 2007CA19. On the basis of investigations of the dynamical evolution of NEAs, Fernandez et al (2014) suggest that some of them, including 2007CA19, that move on stable orbits must be classified as primordial asteroids. Following their suggestion, comets Machholz, Encke, and many others are "real" asteroids according to their orbital evolution.…”

Section: Discussionmentioning

confidence: 99%

The potentially hazardous asteroid 2007CA19 as the parent of theη-Virginids meteoroid stream

Бабаджанов

Кохирова

Obrubov

2015

A&A

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The orbit of the potentially hazardous near-Earth asteroid 2007CA19 is classified as comet-like according to the Tisserand parameter with a value of T j = 2.8, therefore the object can be empirically considered as an extinct or dormant Jupiter-family comet. If 2007CA19 is really a former comet, it could have formed a meteoroid stream in the past in the period of its cometary activity. Investigation of the asteroid's orbital evolution shows that 2007CA19 is a quadruple-crosser of the Earth's orbit. Consequently, the meteoroid stream that is supposedly associated with the object can produce four meteor showers if, as expected, the perihelia arguments of the meteoroids are very distributed over the orbit. Theoretical radiants of the predicted showers were calculated using elements of the 2007CA19 osculating orbit that correspond to the positions of intersections with the Earth's orbit. A search for the predicted night-time showers has shown that the Northern and Southern η-Virginids can be associated to 2007CA19. Using the MOID IAU database, we identify two other daytime showers that can be associated with this asteroid. Thus, we confirm that 2007CA19 has an associated meteoroid stream that produces four active meteor showers in the Earth's atmosphere. This relationship supports the dynamical classification of the object and also points to the possibility of its cometary origin.

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Assessing the physical nature of near-Earth asteroids through their dynamical histories

Cited by 25 publications

References 39 publications

Physical Observations of (196256) 2003 Eh1, Presumed Parent of the Quadrantid Meteoroid Stream

Physical Observations of (196256) 2003 Eh1, Presumed Parent of the Quadrantid Meteoroid Stream

Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko

The potentially hazardous asteroid 2007CA19 as the parent of theη-Virginids meteoroid stream

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