An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



Number of Results: 11 Search : belt
asteroid belt
  کمربند ِ سیارکها   
kamarband-e sayyârakhâ

Fr.: ceinture des astéroïdes   

The region of the → solar system located between → Mars and → Jupiter where over a million objects bigger than 1 km across orbit the Sun. Another region populated by minor bodies lies beyond the orbit of → Neptune, the → Kuiper belt.

asteroid; → belt.

Kamarband, → belt; sayyârakhâ plural of sayyârak, → asteroid.

kamarband (#)

Fr.: ceinture   

A strip of leather or cloth worn around the waist. Something that resembles this type of band, e.g. → Gould's Belt, → Belt of Venus.

O.E. belt, from P.Gmc. *baltjaz, from L. balteus "girdle;" → Orion.

Kamarband "belt," from kamar "waist" (Mid.Pers. kamar "waist; belt, girdle," Av. kamarâ- "belt") + band "a band, tie, belt."

Belt of Orion
  کمربند ِ شکارگر، ~ اریون   
kamarband-e Šekârgar, ~ Orion

Fr.: Baudrier d'Orion   

The three stars Delta (δ, → Mintaka), Epsilon (ε, → Alnilam), and Zeta (ζ, → Alnitak) Orionis which form the belt of the mythological figure of the constellation → Orion. See also: → Orion's Belt.

belt; → Orion.

Belt of Venus
  کمربند ِ ناهید   
kamarband-e Nâhid

Fr.: Ceinture de Vénus   

A pink to brownish border above the horizon separating the Earth's dark shadow on the sky from the sky above it. The Belt of Venus appears during a cloudless twilight just before sunrise or after sunset. It is due to scattered red sunlight in the atmosphere. Also called anti-twilight arc.

belt, → Venus.

Gould's Belt
  کمربند ِ گولد   
kamarband-e Gould (#)

Fr.: ceinture de Gould   

A band of hot, young stars (O and B types) and molecular clouds that stretches around the sky. It is tilted by about 20 degrees with respect to the Galactic plane, and has a diameter of about 3000 light-years.

Named after the American astronomer Benjamin A. Gould (1824-1896), who discovered it in 1879 by studying the distribution of the nearest luminous stars in space; → belt.

Kuiper belt
  کمربند ِ کویپر   
kamarband-e Kuiper (#)

Fr.: ceinture de Kuiper   

A region of the → Solar System extending roughly from the orbit of → Neptune, or 30 → astronomical units (AU), to 50 AU from the Sun that contains many small icy bodies. The Kuiper belt is now considered to be the source of the → short-period comets.

Named after Gerard Peter Kuiper (1905-1973), a Dutch-born American astronomer, who predicted the belt in 1951. He is also considered the father of modern planetary science for his contributions to the study of our solar system; → belt.

Kuiper belt object (KBO)
  بر‌آخت ِ کمربند ِ کویپر   
barâxt-e kamarband-e Kuiper

Fr.: objet de la ceinture de Kuiper   

A → Solar System object belonging to the → Kuiper belt. The largest known objects of this type are → Pluto and its moon → Charon, → Quaoar, → Sedna, and → Orcus. See also → trans-Neptunian object.

Kuiper belt; → object.

main belt
  کمربند ِ فریست   
kamarband-e farist

Fr.: ceinture principale   

The area between → Mars and → Jupiter where most of the → asteroids in our → solar system are found.

main; → belt.

Orion's Belt
  کمربندِ شکارگر، ~ اُریون   
kamarband-e Šekârgar, ~ Orion

Fr.: Ceinture d'Orion   

Three prominent stars in the central regions of the constellation → Orion that align to form the "belt" of the mythological Hunter. They are → Alnitak, → Alnilam, and → Mintaka. The easternmost star Alnitak is separated from the middle one, Alnilam, by 1°.36, and the westernmost Mintaka has an angular distance of 1°.23 from Alnilam. Their distance is between 800 and 1,300 light-years from Earth. They probably formed inside the same molecular cloud less than 10 million years ago.

Orion; → belt.

radiation belt
  کمربند ِ تابش، ~ تابشی   
kamarband-e tâbeš (#), ~ tâbeši (#)

Fr.: ceinture de radiations   

A ring-shaped region in the → magnetosphere of a planet in which charged particles are trapped by the planet's magnetic field. The radiation belts surrounding Earth are known as the → Van Allen belts.

radiation; → belt.

Van Allen belts
  کمربندهای ِ وان آلن   
kamarbandhâ-ye Van Allen

Fr.: ceintures de Van Allen   

The ring-shaped regions of charged particles surrounding the Earth from 1 to 6 Earth radii into space. The charged particles are trapped in by the Earth's magnetic field. The inner belt is between 1.2 and 4.5 Earth radii and contains high-energy electrons and protons which originate mainly from interactions between cosmic rays and the upper atmosphere. The outer belt, located between 4.5 and 6.0 Earth radii, contains lower-energy charged particles mainly coming from the solar wind.

Named after James Van Allen (1914-2006), who discovered the belts in 1958 based on measurements made by Explorer 1, the USA's first successful artificial satellite; → belt.