Astrophysics (index)about

Asteroid

(minor planet without comet characteristics)

The term Asteroid is sometimes used to mean Planetoid, (Minor Planets that are not Comets), and sometimes used only to mean the originally-known objects, in the Asteroid Belt, within Jupiter's orbit.

The term's use has evolved as more minor planets are found and studied. Some objects have shown a comet-like structure but without comet-like orbits.

The first discovered asteroids were Ceres and Pallas in 1801, with the 15th discovered in 1851, and were termed asteroids which means star-like since they appeared as points (but moved like planets). Now 100,000 have been identified, many by computer, and the estimated population is millions.

Generally, 10 meters diameter is taken as the line between asteroid and meteroid. The largest asteroids are close to 1,000 km across. Asteroids are generally classified by type of orbit and by spectrum.


(minor planets,solar system,object type)
http://en.wikipedia.org/wiki/Asteroid

Referenced by:
Asteroid Belt
Asteroid Family
Axisymmetric
101955 Bennu
Centaur
Chondrite
Circumstellar Disk
Corotation Resonance (CR)
Catalina Sky Survey (CSS)
Galileo
Kilometer Size Barrier
Kirkwood Gap
Kozai Mechanism
Kuiper Belt (K Belt)
Lagrangian Point
Late Heavy Bombardment (LHB)
LINEAR
LONEOS
Mass Extinction
Mass Spectrometer
Maxwell-Boltzmann Distribution
Meteoroid
Minor Planet
Minor Planet Center (MPC)
Near-Earth Object (NEO)
Nearby Supernova Factory (NSNF)
Occultation Observations
Orbital Resonance
OSIRIS-REx
Planetary Embryo
Planetesimal
Planetoid
Protoplanet
Psyche
Palomar Transient Factory (PTF)
SPACEWATCH
Wide-Field Infrared Survey Explorer (WISE)
Yarkovsky Effect
Yarkovsky-O'Keefe-Radzievskii-Paddack Effect

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