Alpha Centauri System

Terran Alliance Grid Square: 2, -3, 0

Other Names: HakA (Proximans)

Native Sentient Species: None

Non-Native Sentient Species: Humans (H. Sapiens sapiens, H. Sapiens magii, H. Sapiens mentis), Teuthidoids (Xenoanimalis Solis Carbonicus Teuthidus majoris)

Alpha Centauri A (G2 V Spectral)

Alpha Centauri A a (Hot Zone)

Terrestrial
Small (5483 Km Diameter)
Very Low Gravity (0.4g)
Very Thin Poisonous Atmosphere (0.6 Atmospheres, Hydrogen Sulfide primary component)
Flat Geology
Dead Volcanism
No Hydrosphere
No Biosphere
No Moons or Moonlets

Alpha Centauri A b (Hot Zone)

Terrestrial
Small (3959 Km Diameter) [Highly Dense]
Low Gravity (0.75g)
Vacuum Atmosphere
Rugged Geology
Stable Volcanism
No Hydrosphere
No Biosphere
2 Moons, 3 Moonlets
- Alpha Centauri A b A
  - Terrestrial
  - Tiny (1133 Km Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A b B
  - Terrestrial
  - Small (4328 Km Diameter)
  - Very Low Gravity (0.3g)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A b C
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A b D
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A b E
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere

Alpha Centauri A c (Habitable Zone) – “Alpha Prime”

Alpha Prime is the location of the Terran Alliance’s first extrasolar colony. The Alpha Prime Colony as it is still known is located on the largest archipelago of islands on this watery planet, which teems with native plant and animal life. The combination of high gravity, dense atmosphere, and limited land surface limits the possibility for large-scale colonization at this time, but the colony is steadily becoming a popular tourist destination – at least for those who can afford the cost of the interstellar trip.
Terrestrial Medium (18874 Km Diameter)
High Gravity (1.5g)
Dense Breathable Atmosphere (~2 Atmospheres (202 Kilospascals, 1520 mmHg), 22% Oxygen, 70% Nitrogen, 8% Other (mostly inert) Gasses)
- BOON [Oxygen-Breathers] – HIGH OXYGEN CONTENT: Once acclimated to the environment (see HAZARD [Oxygen-Breathers] – NITROGEN NARCOSIS, below), Oxygen-breathing species find it extremely easy to adapt to the gravity of this world thanks to the higher amount of oxygen in the air – effectively this gives them the benefits that normally require months of training in low-oxygen environments provide. Characters originating from a world with between 0.5 and 1.49g gravity suffer none of the normal penalties they would suffer on a higher-gravity world. Characters originating from a world whose gravity is 1.5g or higher instead receive a +5 bonus to Climb, Endurance, Jump, and Strength checks.
- HAZARD [Oxygen-Breathers] – NITROGEN NARCOSIS: For the first few days after arriving at Alpha Prime, oxygen-breathing species essentially suffer from a mild case of nitrogen narcosis. Symptoms include mild impairment of performance of unpracticed tasks, mildly impaired reasoning, and possible mild euphoria – all similar to being mildly intoxicated (One Martini of narcosis). Functionally, in game terms, this is treated as a persistent -1 step on the Condition track. It can only be removed by spending 72 hours acclimating to the increased barometric pressure.
  - Species Affected: Acr, Dwellers (High and Low), Hand of Action (all castes), Hand of Temperance, Humans, Risantha, Ta, Xylat
- NOTE [PROXIMANS]: Due to their innate ability to handle differing atmospheric pressures, Proximans suffer no additional effects beyond the normal they suffer from high Nitrogen concentrations.
Rugged Geology
Dead Volcanism
Very Wet Hydrosphere (91% [Large Islands and Archipelagos])
10C Average Temperature (Variability: -15C to 35C)
Very Abundant Biosphere (Very Advanced Complexity)
2 Moons, 3 Moonlets
- Alpha Centauri A c A – Barely large enough to be considered a moon and not a moonlet, this moon is notable for having thick layers of water and other ices surrounding its small, rocky core.
  - Icy
  - Fine (140 Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Surface Hydrosphere, Thin Subsurface Oceans
  - Very Scarce Biosphere (Very Simple Complexity) – Microbial life has been discovered in the thin layers of water found in between layers of ice on this moon. The water is kept liquid via tidal stress heating of the moon’s substrate rocks.
- Alpha Centauri A c B
  - Terrestrial
  - Small (1d2+1 Thousand Miles Diameter)
  - Very Low Gravity (0.1-0.5g)
  - Vacuum Atmosphere
  - Rugged Geology
  - Dead Volcanism
  - Very Dry Hydrosphere (5% [1 Ocean and 4 Seas])
  - Very Scarce Biosphere (Very Simple Complexity)
- Alpha Centauri A c C
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A c D
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A c E
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere

Alpha Centauri A d (Habitable Zone)

Terrestrial
Tiny (2d6 Hundred Miles Diameter)
Very Low Gravity (0.1-0.5g)
Very Thin Breathable (Tainted [Low Oxygen]) Atmosphere
Very Flat Geology
Dead Volcanism
No Hydrosphere
-10F Average Equatorial Temperature (3F Variability)
No Biosphere
No Moons or Moonlets

Alpha Centauri A e (Cold Zone)

Gas Giant
Small Gas Giant (2d6+20 Thousand Miles Diameter)
Gas Giant Gravity
Gas Giant Atmosphere
5 Moons, 4 Moonlets
- Alpha Centauri A e A
  - Terrestrial
  - Tiny (2d6 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmopshere
  - Very Flat Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A e B
  - Icy
  - Fine (1d4 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A e C
  - Terrestrial
  - Fine (1d4 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Flat Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A e D
  - Icy
  - Small (1d2+1 Thousand Miles Diameter)
  - Low Gravity (0.51-0.8g)
  - Vacuum Atmosphere
  - Flat Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A e E
  - Icy
  - Tiny (2d6 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Rugged Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri A e F
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A e G
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A e H
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri A e I
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere

Alpha Centauri A f (Cold Zone)

Icy
Tiny (2d6 Hundred Miles Diameter)
Microgravity (0.1g or less)
Vacuum Atmosphere
Very Flat Geology
Dead Volcanism
No Hydrosphere
No Biosphere
No Moons or Moonlets

Alpha Centauri B (K1 V Spectral)

Alpha Centauri B a (Habitable Zone)

Terrestrial
Small (1d2+1 Thousand Miles Diameter)
Very Low Gravity (0.1-0.5g)
Very Thin Poisonous Atmosphere
Rugged Geology
Dead Volcanism
No Hydrosphere
0F Average Equatorial Temperature (24F Variability)
Standard Biosphere (Basic Complexity)
1 Moonlet
- Alpha Centauri B a A
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere

Alpha Centauri B b (Cold Zone)

Icy
Medium (2d4+4 Thousand Miles Diameter)
Standard Gravity (0.81-1.2g)
Vacuum Atmosphere
Rugged Geology
Very Active Volcanism
No Hydrosphere
No Biosphere
No Moons or Moonlets

Alpha Centauri AB (Planets orbiting far enough out to orbit both stars)

Alpha Centauri AB a (Cold Zone)

Icy
Large (1d4+12 Thousand Miles Diameter)
Very High Gravity (2.01-4.0g)
Very Thin Variable Atmosphere
Rugged Geology
Active Volcanism
Very Dry Hydrosphere (8% [Scattered Lakes])
No Biosphere
No Moons or Moonlets

Alpha Centauri AB b (Cold Zone)

Gas Giant
Small Gas Giant (2d6+20 Thousand Miles Diameter)
Gas Giant Gravity
Gas Giant Atmosphere
7 Moons, 15 Moonlets
- Alpha Centauri AB b A
  - Terrestrial
  - Tiny (2d6 Hundred Miles Diameter)
  - Very Low Gravity (0.1-0.5g)
  - Vacuum Atmosphere
  - Very Rugged Geology
  - Active Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b B
  - Terrestrial
  - Small (1d2+1 Thousand Miles Diameter)
  - Very Low Gravity (0.1-0.5g)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b C
  - Terrestrial
  - Tiny (2d6 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Rugged Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b D
  - Terrestrial
  - Medium (2d4+4 Thousand Miles Diameter)
  - Standard Gravity (0.81-1.2g)
  - Standard Variable Atmosphere
  - Very Rugged Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b E
  - Icy
  - Small (1d2+1 Thousand Miles Diameter)
  - Very Low Gravity (0.1-0.5g)
  - Vacuum Atmosphere
  - Standard Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b F
  - Icy
  - Tiny (2d6 Hundred Miles Diameter)
  - Very Low Gravity (0.1-0.5g)
  - Vacuum Atmosphere
  - Very Rugged Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b G
  - Icy
  - Tiny (2d6 Hundred Miles Diameter)
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
  - Rugged Geology
  - Dead Volcanism
  - No Hydrosphere
  - No Biosphere
- Alpha Centauri AB b H
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b H
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB J
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b K
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b L
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b M
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b N
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b O
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b P
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b Q
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b R
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b S
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b T
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b U
  - Terrestrial [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere
- Alpha Centauri AB b V
  - Icy [Moonlet]
  - Diminutive
  - Microgravity (0.1g or less)
  - Vacuum Atmosphere

Worlds That Might Have Been