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General astronomy
Industry: Astronomy
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General astronomy
61 Cygni
Astronomy; General astronomy
The first star other than the Sun to have its parallax, and hence distance, measured. The star is a double orange dwarf.
A band
Astronomy; General astronomy
One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's atmosphere. (originally ...
A star
Astronomy; General astronomy
Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are present; in late A stars ...
Achilles
Astronomy; General astronomy
Trojan asteroid (60° ahead of Jupiter. It was the first Trojan to be discovered.
active Sun
Astronomy; General astronomy
The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.
AE Aurigae
Astronomy; General astronomy
Runaway star which diverges from a comparatively small area in Orion.
