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Å

Å   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Symbol for *angstrom.

AAO

AAO   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *Australian Astronomical Observatory.

AAS

AAS   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *American Astronomical Society.

AAT

AAT   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *Anglo-Australian Telescope.

AAVSO

AAVSO   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *American Association of Variable Star Observers.

Abell clusters

Abell clusters   Reference library

The Oxford Companion to Cosmology

Reference type:
Subject Reference
Current Version:
2008

George Abell is best remembered for his catalogue of clusters of galaxies, a result of his PhD work at the

Abell Catalogue

Abell Catalogue   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

A catalogue of 2712 rich clusters of galaxies published in 1958 by the American astronomer George Ogden Abell (1927–83

Abell cluster

Abell cluster   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

A cluster of galaxies listed in the *Abell Catalogue. To appear in the catalogue, a cluster must satisfy

Abell radius

Abell radius   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

A radius of about 2 megaparsecs within which at least 50 galaxies of a particular range of brightness must be

aberration, optical

aberration, optical   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

An imperfection or error in the image produced by a lens, mirror, or optical system. There are six types of

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