Alcyone (star)

Alcyone A1 (25 Tauri)
Spectral	B7 IIIe
Type
Multiple	(See Text)
Luminosity	2030 LSol
Absolute magnitude	-2.62
Mag Terra	2.87
Temperature	12250° K
Mass	3.5 MSol
Radius	8.2 RSol
Companion	(See Text)

Alcyone A2 (25 Tauri)
Spectral	?
Type
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Temperature	° K
Mass	(Very Low Mass) MSol
Companion	(See Text)

Alcyone A3 (25 Tauri)
Spectral	?
Type
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Temperature	° K
Mass	~1.8M MSol
Companion	(See Text)

Alcyone B (24 Tauri)
Spectral	A0 V
Type	Main Sequence
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Mag Terra	6.28
Temperature	° K
Companion	(See Text)

Alcyone C (V647 Tauri)
Spectral	A7 V
Type	Main Sequence
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Mag Terra	8.27
Temperature	° K
Companion	(See Text)

Alcyone D1
Spectral	F3 V
Type	Main Sequence
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Mag Terra	9.15
Temperature	° K
Companion	(See Text)

Alcyone D2
Spectral	F3 V
Type	Main Sequence
Multiple	(See Text)
Luminosity	LSol
Absolute magnitude
Mag Terra	9.15
Temperature	° K
Companion	(See Text)

The star Alcyone (otherwise known as 25 Tauri or Eta Tauri) is a multiple star system of many components, the largest of which is a B7 type giant star. There are also a number of fainter stars that are located very close to Alcyone, all of which are likely members of the same cluster.

• This star is the brightest member of the Pleiades Cluster.

Description (Specifications)

Alcyone is a multiple star system of significant size. It is a triple star orbited by 3 additional stars, one of which is itself a double star.

• The primary star Alcyone A is itself a triple star system. The central star of Alcyone A (Alcyone A¹) is a blue-white B7 IIIe type star that has a high rotational velocity (~ 149 km/s), which has created an orbiting gaseous disk around the star's equator.

• The closest companion (Alcyone A²) has a very low mass and orbits very close to the primary, with a likely orbital period of just over four days.
• The second companion (Alcyone A³) is about half the mass of Alcyone A¹ and lies at a distance of about 5 AU, orbiting Alcyone A¹ in about 830 days.

• Alcyone B (also known as 24 Tauri) is a blue-white A0 V type main sequence star.
• Alcyone C (also known as V647 Tauri) is a bluish-white A7 V type Delta Scuti variable star.
• Alcyone D is itself a double star composed of a pair of white F3 V type main sequence stars.

The Alcyone star system lies approximately 123.6pc from Terra, and is located in a Rimspinward/Spinward direction from Terra at bearing 166.7^o Galactic Longitude and -23.5^o South Galactic Latitude.

History & Background (Dossier)

Despite the similarity in name, Alcyone is NOT the primary star of the world Alcyone/Delos (Neworld 1023), which orbits a G8 V main sequence star. The primary star of the world "Alcyone" does lie close to the actual location of the star named Alcyone as seen in the sky from Terra's surface, however (though it lies at about half the distance from Terra of the actual star Alcyone), and likely lends the world its name.

• Alcyone is one of the "Seven Sisters" of the Pleiades Cluster (M45), and is located in the Subaru Subsector of the Seven Sisters Sector (a.k.a. Ahkiweahi' Sector) rimward of the Aslan Hierate.

Image Repository

TravellerMap (T5SS):
[1]

References & Contributors (Sources)

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This page uses content from Wikipedia. The original article was at Eta_Tauri. The list of authors can be seen in the page history. The text of Wikipedia is available under the Commons Attribution-ShareAlike 3.0 Unported License.

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• EXTERNAL LINK: SIMBAD @ University of Strasbourg: [2]
• Author & Contributor: WHULorigan