Difference between revisions of "Duna"
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(→Atmosphere: Duna's atmospheric pressure appears to peak at about 0.2 atm.) |
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== Atmosphere == | == Atmosphere == | ||
| − | Duna's atmosphere begins at approximately 41km. Parachutes work | + | Duna's atmosphere begins at approximately 41km and is only 20% as dense [[Kerbin]]'s. (A [[LV-N Atomic Rocket Engine|nuclear engine]] has a specific impulse of 220 at 1 atm, 800 in vacuum, and 684.2 at Duna altitude 5 m. This means the Duna atmospheric pressure at 5 m is roughly 1 - (684.2 - 220) / (800 - 220) = 0.1997 atm.) |
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| + | Parachutes work at lower efficiency than on Kerbin, making powered descent necessary when landing from orbit (unless your craft is just a pod with a parachute). | ||
== Natural Satellites == | == Natural Satellites == | ||
Revision as of 05:15, 23 September 2012
Duna is the fourth planet of the Kerbolar star system. It is the Mars analog for Kerbal Space Program and is mostly red with polar icecaps.
Contents
Characteristics
- Equatorial Radius: 320km
- Mass: 4.5149569e21kg
- Density: 32.893877139e12 kg/km^3
- Volume: 137.258277e^15m^3
- 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: 2,865.5 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 and is only 20% as dense Kerbin's. (A nuclear engine has a specific impulse of 220 at 1 atm, 800 in vacuum, and 684.2 at Duna altitude 5 m. This means the Duna atmospheric pressure at 5 m is roughly 1 - (684.2 - 220) / (800 - 220) = 0.1997 atm.)
Parachutes work at lower efficiency than on Kerbin, making powered descent necessary when landing from orbit (unless your craft is just a pod with a parachute).
Natural Satellites
Duna's only natural satellite is the moon Ike.
See Also
