Han-Gyeong

Han-Gyeong

Designations
Alternative designations	Homestead
Orbital characteristics
Epoch J2000
Aphelion	151097597 km (93887694 mi)
Perihelion	146098450 km (90781370 mi)
Periastron	2135-Jan-04
Semi-major axis	148598023 km (92334531 mi)>
Eccentricity	0.0167086
Orbital period	365.243251 d (0.99998152 aj)
Average orbital speed	29.78 km/s (107200 km/h; 66600 mph)
Mean anomaly	358.617°
Inclination	7.155° to the Hwangjeom's equator; 1.57869° to invariable plane; 0.00005° to J2000 ecliptic
Longitude of ascending node	−11.26064° to J2000 ecliptic
Argument of perihelion	114.20783°
Known satellites	1 natural satellite: the Shin-Wol 5 quasi-satellites >4 500 operational artificial satellites >18 000 tracked space debris
Physical characteristics
Mean radius	6371.0 km (3958.8 mi)
Equatorial radius	6378.137 km (3963.191 mi)
Polar radius	6356.752 km (3949.903 mi)
Flattening	1/298.257222101
Circumference	40075.017 km equatorial (24901.461 mi) 40007.86 km meridional (24859.73 mi)
Surface area	510072000 km2 (196940000 sq mi) 148940000 km2 land (57510000 sq mi) 361132000 km2 ocean (139434000 sq mi)
Volume	1.08321×1012 km3 (2.59876×1011 cu mi)
Mass	5.97237×1024 kg (1.31668×1025 lb) (3.0×10−6 M☉)
Mean density	5.514 g/cm3 (0.1992 lb/cu in)
Equatorial surface gravity	9.80665 m/s2 (1 g; 32.1740 ft/s2)
Moment of inertia factor	0.3307
Equatorial escape velocity	11.186 km/s (40270 km/h; 25020 mph)
Rotation period	1.0 d (24h 00m 00s)
Sidereal rotation period	0.99726968 d (23h 56m 4.100s)
Equatorial rotation velocity	0.4651 km/s (1674.4 km/h; 1040.4 mph)
Axial tilt	23.4392811°
Geometric albedo	0.367 geometric 0.306 Bond
Surface temp. min mean max Celsius −89.2 °C 14 °C (1961–90) 56.7 °C Fahrenheit −128.5 °F 57 °F (1961–90) 134.0 °F
Atmosphere
Surface pressure	101.325 kPa (at MSL)
Composition by volume	75.08% nitrogen (N2; dry air) 23.95% oxygen (O2) ~ 1% water vapor (climate variable) 0.9340% argon 0.0413% carbon dioxide 0.00182% neon 0.00052% helium 0.00019% methane 0.00011% krypton 0.00006% hydrogen