Tombaugh

Tombaugh from orbit. New Ituri is visible in the northern hemisphere.

Designations

Alternative names

Tau Ceti j

Adjectives

Tombauvian • Tombovian

Orbital characteristics

Apastron

0.8745 AU

Periastron

0.7684 AU

Semi-major axis

0.8214 AU

Eccentricty

0.0646

Orbital period

0.8417 a
307.4153 d
355.6187 local days

Satellites

2 (Annette and Alden)

Physical characteristics

Equatorial radius

1.3838 R_E
8,816.2 km
5,478.1 mi

Polar radius

1.3769 R_E
8,772.4 km
5,450.9 mi

Flattening

0.0050

Surface area

Total: 374,635,000 sq mi
Land: 51,175,000 sq mi – 13.7% – 0.89 earths
Water: 86.3% (incl. ice 3.2%)

Mass

2.4710 M_E

Mean density

5.15 g/cc
0.93 ρ_E

Surface gravity

1.2904 g

Escape velocity

14.96 km/s

Solar rotation period

0.8645 d
(20h 44m 48.65s)

Siderial rotation period

0.8620 d
(20h 41m 19.22s)

Axial tilt

33.54°

Albedo

0.28

Temperature

265.4 K (blackbody)

Surface temp.	min	mean	max
Celsius	–46.9 C	9.7 C	52.1 C
Fahrenheit	–52.4 F	49.4 F	125.7 F

Atmosphere

Surface pressure

1.9704 atm
1,996.55 mb

Composition by volume

65.84% nitrogen (N₂)
22.57% oxygen (O₂)
3.12% argon (Ar)
0.01% carbon dioxide (CO₂)

Biosphere

Abiogenesis: 5.41 Ga
Multicellular life: 4.06 Ga
Photosynthesis: 3.21 Ga
Oxygenation: 375 Ma
Animal life: N/A

Tombaugh is the seventh planet in the Tau Ceti system. It is the location of multiple human colonies, including New Ituri and New Texas.

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