Quantitative model of the release of sodium from meteoroids in the vicinity of the Sun: Application to Geminids

Čapek, D.; Borovička, J.

doi:10.1016/j.icarus.2009.02.034

Cited by 22 publications

(21 citation statements)

References 45 publications

(52 reference statements)

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“…The computation ofČapek & Borovička (2009) showed that Na can be lost from Geminids by thermal desorption provided that meteoroids are composed from grains not larger than several hundreds of microns and that the pores between the grains are interconnected. They suggested that variation of Na content in Geminids may be due to varying grain sizes.…”

Section: Resultsmentioning

confidence: 99%

Material properties of transition objects 3200 Phaethon and 2003 EH₁

et al. 2009

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Abstract. Asteroids 3200 Phaethon and 196256 (2003 EH1 ) are connected with two major meteoroid streams, Geminids and Quadrantids, respectively. We have modeled the observed light curves and decelerations of Geminid and Quadrantid meteors and studied their spectra. In both cases, we have found typical bulk densities of about 2600 kg m −3 , much larger than in cometary meteoroids. Sodium was partially lost from Geminids and Quadrantids due to solar heating. The Quadrantid material was therefore not hidden deep inside the parent body 1500 years ago, when the perihelion was low enough for sodium loss to occur.

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Section: Resultsmentioning

confidence: 99%

Material properties of transition objects 3200 Phaethon and 2003 EH₁

et al. 2009

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“…The Geminid meteoroids show extreme diversity in their Na abundance, from strong depletion to near Sun-like Na content (Harvey 1973;Borovička et al 2005;Kasuga et al 2005). Presumably, this compositional diversity reflects different thermal modification on Phaethon (or perhaps the larger sized precursor body) itself Kasuga et al 2006;Ohtsuka et al 2006;Kasuga & Jewitt 2008;Capek & Borovička 2009;Kasuga 2009;Ohtsuka et al 2009). For the Quadrantid meteoroids, the measured line intensity ratios show that Na is less depleted than in the majority of Geminid meteoroids (Koten et al 2006;Borovička et al 2010).…”

Section: Discussionmentioning

confidence: 99%

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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“…The only exception is the iron meteroidtype meteoroid SX001 mentioned earlier, which, nevertheless, does not contain Na either. This corresponds to the conlcusion of Borovička et al (2005), that frequent approaches to within ≈0.2 AU to the Sun lead to the loss of Na from meteoroids in the millimeter-size range, irrespective to their origin (see alsoČapek & Borovička 2009). …”

Section: Sun-approaching Meteoroidsmentioning

confidence: 96%

Catalogue of representative meteor spectra

Vojáček

Borovička

Koten

et al. 2015

A&A

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Aims. We present a library of low-resolution meteor spectra that includes sporadic meteors, members of minor meteor showers, and major meteor showers. These meteors are in the magnitude range from +2 to −3, corresponding to meteoroid sizes from 1 mm to 10 mm. Methods. Parallel double-station video observations allowed us to compute heliocentric orbits for all meteors. Most observations were performed during the periods of activity of major meteor showers in the years between 2006 and 2012. Spectra are classified according to relative intensities of the low-temperature emission lines of Mg, Na, and Fe. Results. Shower meteors were found to be of normal composition, except for Southern δ Aquariids and some members of the Geminid shower, neither of which have Na in the meteor spectra. Variations in Na content are typical for the Geminid shower. Three populations of Na-free mereoroids were identified. The first population are iron meteorites, which have an asteroidal-chondritic origin, but one meteoroid with low perihelion (0.11 AU) was found among the iron meteorites. The second population were Sun-approaching meteoroids in which sodium is depleted by thermal desorption. The third population were Na-free meteoroids of cometary origin. Long exposure to cosmic rays on the surface of comets in the Oort cloud and disintegration of this crust might be the origin of this population of meteoroids.

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Quantitative model of the release of sodium from meteoroids in the vicinity of the Sun: Application to Geminids

Cited by 22 publications

References 45 publications

Material properties of transition objects 3200 Phaethon and 2003 EH₁

Material properties of transition objects 3200 Phaethon and 2003 EH₁

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

Catalogue of representative meteor spectra

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Quantitative model of the release of sodium from meteoroids in the vicinity of the Sun: Application to Geminids

Cited by 22 publications

References 45 publications

Material properties of transition objects 3200 Phaethon and 2003 EH1

Material properties of transition objects 3200 Phaethon and 2003 EH1

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

Catalogue of representative meteor spectra

Contact Info

Product

Resources

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Material properties of transition objects 3200 Phaethon and 2003 EH₁

Material properties of transition objects 3200 Phaethon and 2003 EH₁