Terra (Safìr Alliance)

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Terra

"The Blue Marble" photograph of Terra, taken from Apollo 17
Designations
Alternative names	Earth Gaia Kjeàjnáis taÁzekânenu (Âirumâli systematic name)
Orbital characteristics
Epoch J2000.0
Aphelion	152,098,232 km 1.01671388 AU
Perihelion	147,098,290 km 0.98329134 AU
Semi-major axis	149,598,261 km 1.00000261 AU
Eccentricity	0.01671123
Orbital period	365.256363004 days 1.000017421 yr
Average orbital speed	29.78 km/s107,200 km/h
Mean anomaly	357.51716°
Inclination	7.155° to Sol's equator 1.57869° to invariable plane
Longitude of ascending node	348.73936°
Argument of perihelion	114.20783°
Satellites	1 natural (Luna), 8,300+ artificial (as of 1 March 2001[ref])
Physical characteristics
Mean radius	6,371.0 km
Equatorial radius	6,378.1 km
Polar radius	6,356.8 km
Flattening	0.0033528
Circumference	40,075.017 km (equatorial)
Surface area	510,072,000 km2 148,940,000 km2 land (29.2 %) 361,132,000 km2 water (70.8 %)
Volume	1.08321×1012 km3
Mass	5.9736×1024 kg 3.0×10−6 Suns
Mean density	5.515 g/cm3
Equatorial surface gravity	9.780327 m/s2 0.99732 g
Escape velocity	11.186 km/s
Sidereal rotation period	0.99726968 d 23h 56m 4.100s
Equatorial rotation velocity	1674.4 km/h
Axial tilt	23°26'21".4119
Albedo	0.367 (geometric) 0.306 (Bond)
Surface temp. min mean max Kelvin 184 K 287.2 K 330 K Celsius −89.2 °C 14 °C 56.7 °C
Atmosphere
Surface pressure	101.325 kPa (MSL)
Composition	78.08% nitrogen (dry air) 20.95% oxygen (dry air) ≤1% water vapor (variable) 0.9340% argon 0.0415% carbon dioxide 0.00182% neon 0.00052% helium 0.00017% methane 0.00011% krypton 0.00006% hydrogen

Terra is an alternate-dimension planet Earth, not to be confused with those known to Hoenn or to Sayaffallah, with whose human population the safìr made first contact in the summer of 1999 CE.