Castor (SR 2339) (system)

Castor Aa
Spectral	A1.5 IV/V
Type	Main Sequence/ Subgiant
Multiple	Sextenary (See Text)
Luminosity	LSol
Absolute magnitude	+0.986
Mag Terra	1.93
Temperature	10,280° K
Mass	2.7 MSol
Radius	2.4 RSol
Companion	Castor Ab (See Text)

Castor Ab
Spectral	M1 Ve
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	LSol
Absolute magnitude
Temperature	° K
Mass	< 0.5 MSol
Companion	Castor Aa (See Text)

Castor Ba
Spectral	A1 IV/Vm
Type	Main Sequence/ Subgiant
Multiple	Sextenary (See Text)
Luminosity	LSol
Absolute magnitude	+1.886
Mag Terra	2.97
Temperature	8840° K
Mass	2.98 MSol
Radius	3.3 RSol
Companion	Castor Bb (See Text)

Castor Bb
Spectral	M1 Ve
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	LSol
Absolute magnitude
Temperature	° K
Mass	< 0.5 MSol
Companion	Castor Ba (See Text)

Castor Ca (YY Geminorum)
Spectral	M0.5 Ve
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	0.0733 LSol
Absolute magnitude	+8.950
Mag Terra	9.83
Temperature	3820° K
Mass	0.5992 MSol
Radius	0.6191 RSol
Companion	Castor Cb (See Text)

Castor Cb (YY Geminorum)
Spectral	M0.5 Ve
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	0.0733 LSol
Absolute magnitude	+8.950
Mag Terra	9.83
Temperature	3820° K
Mass	0.5992 MSol
Radius	0.6191 RSol
Companion	Castor Ca (See Text)

The star Castor (otherwise known as Alpha Geminorum) is a sextenary star system which (along with the star Pollux) represent the two "twins" comprising the Terran-sky constellation of Gemini.

Description

The Castor star system is a sextuple system of stars comprised of three separate binary pairs.

• Castor A is comprised of a blue-white early subgiant star (Castor Aa) orbited by a pinkish-orange "red dwarf" main sequence star (Castor Ab). They orbit each other with a period of 9.213 days and an orbital eccentricity of e=0.5.
• Castor B is comprised of a blue-white early subgiant star (Castor Ba) orbited by a pinkish-orange "red dwarf" main sequence star (Castor Bb). They orbit each other with a period of 2.93 days.
• Castor C (otherwise known as the BY Draconis variable type star YY Gemninorum) orbits the Castor A/B pair with a period of about 14000 years. It is comprised of two nearly identical pinkish-orange "red dwarf" main sequence stars (Castor Ca and Castor Cb) that orbit each other once every 0.814 days.

The Castor star system lies approximately 15.6pc from Terra, and is located in a Rimward/Rimspinward direction from Terra at bearing 187.4^o Galactic Longitude and +22.5^o North Galactic Latitude.

History & Background (Dossier)

Castor is the primary star of the beltworld Castor/Gemini (Solomani Rim 2339).

Image Repository

TravellerMap (T5SS):
[1]

References & Contributors (Sources)

This article has metadata.

This page uses content from Wikipedia. The original article was at Castor_(star). 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 Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• John Harshman, Marc Miller. Solomani (Game Designers Workshop, 1986), TBD.
• Jon F. Zeigler. Rim of Fire (Steve Jackson Games, 2000), TBD.
• Paul Drye, Loren Wiseman, Jon F. Zeigler. Interstellar Wars (Steve Jackson Games, 2006), TBD.
• David L. Pulver. Solomani Rim (Mongoose Publishing, 2012), TBD.
• David L. Pulver. Solomani (Mongoose Publishing, 2012), TBD.
• EXTERNAL LINK: SIMBAD @ University of Strasbourg
• Traveller Wiki Editorial Team
• Author & Contributor: WHULorigan
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science