Difference between revisions of "Duna"
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*[http://en.wikipedia.org/wiki/Semi-major_axis Semi-Major Axis]: 20,726,194.5km or ... [http://en.wikipedia.org/wiki/Astronomical_unit Astronomical Units (A.U.)] | *[http://en.wikipedia.org/wiki/Semi-major_axis Semi-Major Axis]: 20,726,194.5km or ... [http://en.wikipedia.org/wiki/Astronomical_unit Astronomical Units (A.U.)] | ||
| − | *[http://en.wikipedia.org/wiki/Orbital_speed Velocity]: ~7530.65 m/s (average determined by velocity at Apobol and velocity at Peribol. | + | *[http://en.wikipedia.org/wiki/Orbital_speed Velocity]: ~7530.65 m/s (average determined by velocity at Apobol and velocity at Peribol.) |
*[http://en.wikipedia.org/wiki/Longitude_of_the_ascending_node Longitude of Ascending Node]: ...° | *[http://en.wikipedia.org/wiki/Longitude_of_the_ascending_node Longitude of Ascending Node]: ...° | ||
Revision as of 04:47, 21 September 2012
Duna is the fourth planet of the Kerbolar star system.
Contents
Characteristics
- Equatorial Radius: 320km
- Mass: 4.46e21kg to three significant figures. This figure was gained by a measure of speed and radius of a circular orbit at 46 million meters.
- Density: ... g/cm³
- Surface Gravity: ~2.94m/s²
- Gravitational parameter: 301.321km³/s²
- Escape velocity from surface: 1372.3m/s
- Sidereal Rotation Period: ... hours; Rotation: ... degrees per hour, or ... m/s at the equator
- Solar Day: 18 hours, 3 minutes, 11 seconds.
- Synchronous Orbit altitude: ... km; Stationary Orbit velocity: ... m/s
Orbital Characteristics
- Semi-Major Axis: 20,726,194.5km or ... Astronomical Units (A.U.)
- Velocity: ~7530.65 m/s (average determined by velocity at Apobol and velocity at Peribol.)
- Argument of Periapsis: ...°
- Mean Anomaly at Epoch UT = ...
- Orbital Period: 4,809.6 hours, or 200.4 Earth days
- Sphere of influence: 47,921 km
Topography
Duna is a iron-rich planet which has greatly varying land altitude, the consequence of which is very difficult judgment of a safe landing position. Its mountainous ranges are a peril to landing craft, especially considering the thin atmosphere, where very little aerobraking can be done safely. It is important to slow one's ship down before coming into the atmosphere, to ensure a safe decent. Its two poles are very expansive and are the result of a thin atmosphere.
Atmosphere
Duna's atmosphere begins at approximately 41km. Parachutes work with a slightly low efficiency, making powered descent a required step of landing on the surface from orbit.
Natural Satellites
Duna's only natural satellite is the moon Ike.
