Alpha Centauri

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Alpha Centauri is the closest independent gravitational system to Sol, as it does technically host Proxima Centauri. The main system is a binary, composed of the G2V star Rigil Kentaurus (α Cen A) and the K1V star Toliman (α Cen B). The system has several planets around each star and a circumbinary cloud of cometary debris, as well as a vast number of skgri ruins and one of the largest human-built citystations in known space: Chiron. It is one of the most high-traffic hub systems at the heart of human space.
The Alpha Centauri system is governed by the Centauri Republic, a founding member of the United Nations of Humanity. Humans populate the system in abundance, some eighteen billion strong; in some cases introducing minor genetic modifications into their populations to assist in adaptation to their adoptive worlds.

Astrography

Location

Alpha Centauri lies just over 4 lightyears from Sol, placing it very close to the approximate center of known space. It has jump links to seven other systems: Luhman 16, Sol, Helios, Wolf 359, Chaos, Ross 154, Sirius, Qaytaral, and Proxima Normae - the last one by way of a rogue planet stopover.

Structure

Alpha Centauri is a binary system with wide separation, composed of two primary stars (Rigil Kentaurus and Toliman) and their respective planets as well as a circumbinary disk of cometary debris (the Centauri Halo). The pair orbit about a common center with an orbital period of just under 80 years, with the distance between the two ranging from 35.6 AU to 11.2 AU.

Alpha Centauri

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The Alpha Centauri system, minus Proxima.

SYSTEM OUTLINE

Rigil Kentaurus

• Fornax* (s)
• Epona* (d)
• Silvanus^Δ* (i)
  • Feronia^Δ* (e)
• Fortuna^Δ* (tr)
  • Pax* (s)
  • Concordia^Δ* (tr)
  • Sors* (mp)
  • Spero* (mp)
  • Chiron (station)
• {Rigil Kent Belt}
  • Mellona* (s)
  • Bubona* (mp)
• Fontus* (n)
  • Venelia* (e)
  • Volturnus* (e)
  • Juturna* (e)

Toliman

• Vulcan (v)
• {Toliman Belt}
  • Tiberinus* (s)
    • Tibertus* (mp)
  • Acis* (mp)
  • Elernus* (mp)
  • Tellus Ring^Δ* (megastructure)
• Minerva (j)
  • Pietas* (s)
  • Honos* (e)
  • Virtus* (e)
  • Veritas* (e)
  • Victoria^Δ* (tr)
  • Vacuna^Δ* (tr)
  • Justitia* (c) + Aequitas* (e)
• Juno (j)
  • Prorsa* (d)
  • Aegeria* (e)
  • Carmenta* (e)
  • Porima* (e)
  • Juventas* (q)
  • Moneta Archive (megastructure)
• Bacchus* (n)
  • Liber* (e)

{Centauri Halo}

• Quirinus* (d)
  • Hora* (e)
• Mantus* (d)
  • Mania* (e)
• Viduus* (e)
• Libitina* (e)

Ecology

Several worlds in the Rigil Kent subsystem bear native life. There are two separate, unique trees of life present in the subsystem: Silvanigenia, present on Silvanus and its moon Feronia; and Fortunagenia, present on Fortuna and its cobinary planet Concordia. The Toliman subsystem, however, is host to three transplanted branches of Hemeragenid life: one on the moon Victoria, one on its neighboring moon Veritas, and one on the Tellus Ring construct.

Maps

• 

  Alpha Centauri

  The Alpha Centauri system, minus Proxima.

Archive Data

DESIGNATIONS

Bayer designation

α Centauri

Sun names

1. Rigil Kent
2. Toliman

UNAC Local Star Catalogue designation

USC 002

Other designations

• GJ 559
• HIP 71681 / 71683
• ^Opamu/_Uwari
• OH^SE 26
• Veqhnasi Zaal
• AM 126
• 3 Pirrzne
• EZN 77
• Amh Gebor ikh'Bakhur
• KAZ 150

SYSTEM CHARACTERISTICS

Location

Local Interstellar Cloud, Local Bubble, Orion–Cygnus Arm, Milky Way, Virgo Supercluster

Sol-relative coordinates

RA 14h 39m 36.5s
DEC -60° 50' 02"
DIST 4.36 ly

Proximal system

Proxima Centauri (0.12 ly)

System diameter (farthest orbit)

1.68e+10 km (Libitina)

System diameter (heliopause)

1.89e+10 km

System mass

2.01 M_Sol

Semi-major axis

23.3 AU

Eccentricity

0.52

Period

79.762 years

Circumbinary stability limit

88.24 AU

Major planets

15

Biotic planetoids

6

Inhabited planetoids

136

STELLAR CHARACTERISTICS

Component stars

1. Rigil Kentaurus (α Cen A)
2. Toliman (α Cen B)

Stellar type

1. G2V
2. K1V

Mass

1. 1.079 M_Sol
2. 0.909 M_Sol

Temperature

1. 5790 K
2. 5260 K

Luminosity

1. 1.506 L_Sol
2. 0.5 L_Sol

Age

5.3 Gyr

HABITATION INFORMATION

Total population

12.45 billion

Species demographics

• 95% human
• 2% Calypsian
• 2% shyxaure
• 1% Other

Demonym

Centauri

Administrated by

Centauri Republic

Member of

United Nations of Humanity

ERPA Restriction Level

III

Related Historical Events

• Sept. 19 2078 CE - Present
  SAMCO Project

Reality Check

The real Alpha Centauri system has no confirmed planets, but it does have one unconfirmed planet candidate: a possible ice giant orbiting in the habitable zone of Rigil Kentaurus.