This causes aphelion collaps such that a circular orbit is soon attained thereafter the particle spirals slowly towards the Sun. See also: Limiting magnitude, Video observations Poynting-Robertson effect A dissipative force due to the anisotropic loss of momentum by a particle through re-radiation of solar energy. Multiple-station photography allows the determination of precise meteoroid orbits. Normal-lens photography is restricted to meteors brighter than about +1mag. The accuracy of the derived meteor coordinates is very high. See also: Fireball Photographic observations The meteors are captured on a photographic film or plate. Bright fireballs occasionally caused trains visible for several minutes. The intensity and duration depend on the meteoroid’s atmospheric entry velocity, its size, and its composition. See also: Apollo asteroids Persistent train Remaining glow due to ionization in the upper atmosphere after the passage of a meteoroid. Perihelion distance abbreviation q, distance of the least heliocentric separation for a body in an eccentric orbit q=a(1-e). Path The projection of the line of motion of the meteor on the celestial sphere, as seen by the observer. Micrometeorites found on the Earth’s surface are smaller than 1mm, those collected in the Stratosphere are rarely as large as 50 micro-m. The actual size is not rigorously constrained but is operationally defined by the collection procedure. See also: Asteroid, Comet, Meteoroid Micrometeorite A small extraterrestrial particle that has survived entry into the Earth’s atmosphere. Various ejection directions and velocities for individual meteoroids cause the width of a stream and the gradual distribution of meteoroids over the entire average orbit. See also: Fireball, Meteor, Meteorite, Meteoroid Stream Meteoroid Stream Stream of solid particles released from a parent body such as a comet or asteroid, moving on similar orbits. See also: Fireball, Meteor, Meteoroid, Micrometeorite Meteoroid A solid object moving in interplanetary space, of a size considerably smaller than a asteroid and considerably larger than an atom or molecule. See also: Meteor, Solar longitude, Trajectory Meteorite A natural object of extraterrestrial origin (meteoroid) that survives passage through the atmosphere and hits the ground. The meteors belonging to one shower appear to emanate from their radiant.
See also: Fireball, Meteor Shower, Meteorite, Meteoroid Meteor Shower A number of meteors with approximately parallel trajectories. Meteor In particular, the light phenomenon which results from the entry into the Earth’s atmosphere of a solid particle from space. See also: Apollo asteroids, Asteroid, Semimajor axis Apollo asteroids Asteroids having semimajor axes a>1.0 au, and perihelion distances q0.983 au.
Aphelion distance Abbreviation Q, distance of greatest heliocentric separation for a body in an eccentric orbit Q=a(1+e). Absolute magnitude The stellar magnitude any meteor would have if placed in the observer’s zenith at a height of 100 km.
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