Double star

Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.
Artist's impression of the discs around the young stars HK Tauri A and B.

Pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes.

- Double star
Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.

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Alpha

Von Struve

Friedrich Georg Wilhelm von Struve

Friedrich Georg Wilhelm von Struve (Василий Яковлевич Струве, trans.

Friedrich Georg Wilhelm von Struve (Василий Яковлевич Струве, trans.

Von Struve
Friedrich Georg Wilhelm von Struve

He is best known for studying double stars and for initiating a triangulation survey later named Struve Geodetic Arc in his honor.

Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.

Winnecke 4

Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.

Winnecke 4 (also known as Messier 40 or WNC 4) is an optical double star consisting of two unrelated stars in a northerly zone of the sky, Ursa Major.

The Roman Empire at its greatest extent

Alpha1 Capricorni

Distant, binary star system dominated by a highly luminous star in the constellation of Capricornus, north of the ecliptic.

Distant, binary star system dominated by a highly luminous star in the constellation of Capricornus, north of the ecliptic.

The Roman Empire at its greatest extent

Three other faint visual companion stars lie within one arc-minute, so are unresolveable in small telescopes.

southern

Theta Muscae

Multiple star system in the constellation Musca ("the Fly") with an apparent magnitude of 5.5.

Multiple star system in the constellation Musca ("the Fly") with an apparent magnitude of 5.5.

southern

To small telescopes, Theta Muscae appears as a double star, with a blue-cream brighter star and an O9III companion of magnitude 7.3 some 5.3 arcseconds away.