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Glossary
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Altazimuth mount :
Two-axis mount for supporting and rotating an instrument about a
vertical and a horizontal axis.
Asteroid :
A small body made of rocks and metals with a size varying between cm and km.
Asteroids are the result of fragments of rocks that do not have to be agglomerated for an
ancient planet due to Jupiter’s infl uence and have an orbit around stars.
Barlow lens :
Modern Barlow lenses are used in astronomy and astrophotography as op-
tical elements to increase the magnifi cation of a telescope.
Bahtinov mask :
Device that facilitates the development of astronomical instruments. It
was named after its inventor Pavel Bahtinov.
Bortle scale :
Defi nes the sky brightness using 9 classes and quantifi es the astronomical
observability of celestial objects and the interference caused by light pollution (1 : very
dark & 9 : very bright).
Celestial :
Positioned in or relating to the sky, or outer space as observed in astronomy.
Collimation :
The process of aligning the optical axis of the mirror.
Comet :
Loosely packed balls of ice made out of gases, dust and rock that orbit the Sun.
Constellation :
Group of apparent stars forming a recognizable shape.
Diff raction :
Light diff raction is a physical phenomenon by which ray lights from a point
source are defl ected at the edge of a non transparent object.
Dwarf planets :
Astronomical astre orbiting around a sun which is not a moon. It has suf-
fi cient mass so that its internal pressure outweighs the cohesive forces of the solid body
and maintains it in hydrostatic equilibrium (in an almost spherical form).
Exoplanet :
Planet located outside the solar system.
Galaxy :
Set of stars, dust, interstellar gas and dark matter whose cohesion is ensured by
gravity.
Light year :
Astronomical units corresponding to the distance (and not the duration) trave-
led by the light in one year (9 461 billion km).
Magnitude :
Measure of the brightness of a star as it appears from Earth.
Messier’s objects :
The Catalog of Nebulae and Star Clusters, better known as the Messier
Catalog, is an astronomical catalog of 110 objects (with a diff use shape) created in 1774 by
Charles Messier. It lists the most beautiful deep sky objects accessible with the instru-
ments of amateur astronomers. The Messier catalog numbers, noted M1 to M110, continue
to be used for these objects, although other names are also widely used.
Near Earth Asteroid :
Asteroid whose orbit intersects that of the earth.
Nebulae :
gas and dust clusters formed by star explosion residue.
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Summary of Contents for eVscope 2
Page 1: ...User Guide eVscope 2 The Universe Awaits ...
Page 3: ...Summary User Guide ...
Page 5: ...User guide 5 English ...
Page 7: ...WARNING User guide 7 English ...
Page 40: ......