19 Terms
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General astronomy
Industry: Astronomy
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General astronomy
artificial satellite
Astronomy; General astronomy
a satellite made by humans which is gravitationaly bound and in orbit of a larger physical object
ascending node
Astronomy; General astronomy
In the orbit of a solar-system body, the point where the body crosses the ecliptic from south to north: for a star, out of the plane of the sky toward the observer.
AI Velorum star
Astronomy; General astronomy
A class of dwarf Cepheids. They are all RR Lyrae stars with periods shorter than 0.25 days.
Aldebaran (alpha Tau, HR 1457)
Astronomy; General astronomy
A K5 III subgiant (a foreground star in the Hyades). It has a faint M2 V companion. It is now known to be slowly and irregularly variable.
Algol (beta Per, Demon star)
Astronomy; General astronomy
1) An eclipsing system of at least three components (B8 V, K0, Am). Period of components A and B is about 68.8 hours; period of components A, B, and C is about 1.9 years. Long term observations also ...
alpha Centauri (Rigil Kent, HR 5459)
Astronomy; General astronomy
A binary star whose components have G2 V and K5 V spectral types. The nearest star system to the Sun and the third brightest star in the night sky.
alpha Persei cluster
Astronomy; General astronomy
A young open cluster with a high mean rotational velocity.
