Atlantis

Atlantis from orbit.

Designations

Alternative names

82 Eridani h, 82 Eridani VII

Adjectives

Atlantean

Orbital characteristics

Apastron

1.3655 AU

Periastron

1.3075 AU

Semi-major axis

1.3365 AU

Eccentricty

0.0217

Orbital period

1.8435 a
673.3309 d
371.5134 local days

Satellites

2 (Timaeus and Critias)

Physical characteristics

Equatorial radius

1.1416 R_E
7,273.2 km
4,519.3 mi

Polar radius

1.1406 R_E
7,266.6 km
4,515.3 mi

Flattening

0.0009

Surface area

Total: 256,354,000 sq mi
Land: 68,200,000 sq mi – 26.2% – 1.19 earths
Water: 73.4%
Ice: 11.7%

Mass

1.7406 M_E

Mean density

6.45 g/cc
1.17 ρ_E

Surface gravity

1.3356 g

Escape velocity

13.82 km/s

Solar rotation period

1.8124 d
(43h 29m 51.36s)

Siderial rotation period

1.8075 d
(43h 22m 51.00s)

Axial tilt

7.66°

Albedo

0.17

Temperature

216.1 K (blackbody)

Surface temp.	min	mean	max
Celsius	–71.0 C	–3.6 C	36.9 C
Fahrenheit	–95.7 F	25.6 F	98.4 F

Atmosphere

Surface pressure

5.4956 atm
5,568.42 mb

Composition by volume

55.86% Nitrogen (N₂)
35.48% Helium (He)
8.50% Oxygen (O₂)
0.16% Carbon dioxide (CO₂)

Biosphere

No native biosphere—all life on Atlantis is imported from Earth.

Atlantis is the seventh planet in the 82 Eridani system. Formerly a lifeless, ice-covered planet, Atlantis was terraformed during the 31st and 32nd centuries. Though the terraforming is regarded as being somewhat "botched" (due to the planet remaining incredibly cold), it has hosted a large human population since 3154.

[ Back ]