Precisely reduced meteoroid trajectories and orbits from the 1995 Leonid meteor outburst

Betlem, Hans; Kuile, Casper Ter; Leven, Jaap van't; Lignie, Marc de; Bellot, Luis R. Rubio; Koop, M.; Angelo, Chris; Wilson, Mike; Jenniskens, Peter

doi:10.1016/s0032-0633(96)00157-2

Cited by 20 publications

(4 citation statements)

References 6 publications

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“…Examples of radiant distributions for the Perseid, Leonid and alpha-Monocerotid outbursts are shown in Figs. 2-4 (Jenniskens et al, 1997a(Jenniskens et al, , 1998Betlem et al, 1997). For the first time, we can now distinguish between the dispersion in right ascension and that in declination.…”

Section: The Ejection Velocitiesmentioning

confidence: 86%

On the dynamics of meteoroid streams

Jenniskens

2014

Earth Planet Sp

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Zodiacal dust evolves from cometary debris through a stage called a meteoroid stream. Meteoroid streams produce meteor showers if a node of the stream is near 1 AU. On occasion, Earth encounters a stream of meteoroids that has not dispersed wide enough to be detected annually. A rare and often short lived enhancement of rates is observed during which the meteors typically have smaller radiant dispersion and sometimes anomalous fragmentation properties and end heights. Here, we summarize recent observations of these meteor outbursts and discuss how the results constrain our knowledge of the early stages of meteoroid stream formation. These stages tie meteoroid streams to cometary dust trails and are an important step in the dynamical evolution from cometary to zodiacal dust.

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Section: The Ejection Velocitiesmentioning

confidence: 86%

On the dynamics of meteoroid streams

Jenniskens

2014

Earth Planet Sp

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“…Kresák & Porubčan (1970) presented meteor shower radiant dispersions for nine showers using high-quality double-station photographic data, and found that the observed radiant spreads were broadly consistent with a 1 km s −1 velocity dispersion. Betlem et al (1997) presented meteor radiants from the 1995 Leonid outburst that appear to exhibit a dispersion much less than 1 • . compared Perseid radiant dispersions in typical and outburst years and found the latter was significantly tighter.…”

Section: Radiant Dispersionsmentioning

confidence: 99%

Realistic gravitational focusing of meteoroid streams

Moorhead

Clements

Vida

2020

Monthly Notices of the Royal Astronomical Society

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The number density and flux of a meteoroid stream is enhanced near a massive body due to the phenomenon known as gravitational focusing. The greatest enhancement occurs directly opposite the massive body from the stream radiant: as an observer approaches this location, the degree of focusing is unbound for a perfectly collimated stream. However, real meteoroid streams exhibit some dispersion in radiant and speed that will act to eliminate this singularity. In this paper, we derive an analytic approximation for this smoothing that can be used in meteoroid environment models and is based on real measurements of meteor shower radiant dispersion.

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“…The real possibility of a Leonid meteor storm in 1998 November was a strong motivation for continuing our ongoing effort to monitor the activity of the shower by visual, photographic, and video techniques (Jenniskens, 1996;Betlem et al, 1997;Langbroek, 1999). The effort was started in 1994, when the Leonid shower first showed enhanced activity in association with the 1998 return of parent comet 55P/TempeI--Tuttle (Jenniskens, 1996).…”

Section: Introductionmentioning

confidence: 99%

Very precise orbits of 1998 Leonid meteors

Betlem¹,

Jenniskens²,

Leven³

et al. 1999

Meteorit & Planetary Scien

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Abstract-Seventy-five orbits of Leonid meteors obtained during the 1998 outburst are presented. Thirtyeight are precise enough to recognize significant dispersion in orbital elements. Results from the nights of 1998 November 16/17 and 17/18 differ, in agreement with the dominant presence of different dust components. The shower rate profile of 1998 November 16/17 was dominated by a broad component, rich in bright meteors. The radiant distribution is compact. The semimajor axis is conjined to values close to that of the parent comet, whereas the distribution of inclination has a central condensation in a narrow range. On the other hand, 1998 November 17/18 was dominated by dust responsible for a more narrow secondary peak in the flux curve. The declination of the radiant and the inclination of the orbit are more widely dispersed. The argument of perihelion, inclination, and the perihelion distance are displaced. These data substantiate the hypothesis that trapping in orbital resonances is important for the dynamical evolution of the broad component.

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Precisely reduced meteoroid trajectories and orbits from the 1995 Leonid meteor outburst

Cited by 20 publications

References 6 publications

On the dynamics of meteoroid streams

On the dynamics of meteoroid streams

Realistic gravitational focusing of meteoroid streams

Very precise orbits of 1998 Leonid meteors

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