General astronomy

General astronomy

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General astronomy

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 ...

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 ...

53 Arietis

Astronomy; General astronomy

Runaway star which diverges from a comparatively small area in Orion.

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.

4N nucleus (even-even nucleus)

Astronomy; General astronomy

Nuclei possessing equal and even numbers of neutrons and protons. 4N nuclei are formed in supernova envelopes at temperatures of at least 2 × 109 K and are very stable.

Achilles

Astronomy; General astronomy

Trojan asteroid (60° ahead of Jupiter. It was the first Trojan to be discovered.

Comet Hartley 2

Astronomy; General astronomy

Comet Hartley 2 was discovered in 1986 by Malcolm Hartley, an Australian astronomer. Comet Hartly 2's circuit around the sun takes about 6.46 years Also known as Comet 103P, the comet was close ...