Difference between revisions of "Duna"

A topographic map of Duna made with the ISA MapSat plugin

Duna's terrain ranges in altitude from 23 to 4740 meters. Its mountainous ranges are a peril to landing craft, especially considering the thin atmosphere, where very little aerobraking can be done safely. Duna's icy poles are quite expansive and are the result of a thin atmosphere.

Duna has several craters, but they appear quite eroded, presumably from wind. There is also a series of small but deep craters, which appear like they originate from a quite recent impact of a large meteorite which fragmented before impact.

There are several maria (large regions of dark soil) at exactly 0 meters altitude. Their flatness and low altitude which allows for more aerobraking make them easy but boring landing locations.

Duna's surface contains anomolous features.

Atmosphere

A comparison of the atmospheres of Duna and Kerbin Duna's atmosphere begins at 41,446 m. It is only 20% as dense as Kerbin's at altitude 0 and is even less dense (relative to Kerbin) at higher altitudes. This effect becomes especially noticeable at Duna's highest points, where its atmosphere is only 21% as dense as its atmosphere at altitude 0. (For comparison, on Kerbin, the atmosphere at the highest peaks is 45% as thick as at sea level.) This lack of density will cause parachutes to semi-deploy much lower, just over 10km for the Mk25 and just under 9km for all the other parachutes. Landing When landing on Duna, aerobraking can reduce orbital and surface velocity greatly, saving fuel. For best results, an aerobraking maneuver should maximize time spent in the atmosphere by entering at a shallow angle and aiming for a landing location in a low-lying area. Like all atmospheres in the game, Duna's atmosphere fades exponentially with increasing altitude (with a scale height of 3000 m). In general, the atmospheric pressure on Duna at an altitude expressed in meters is:[1] ${\displaystyle p_{d}=0.2\ e^{-altitude/3000}}$ Parachutes work at lower efficiency than on Kerbin, making powered descent necessary when landing from orbit (unless you have enough drag/parachutes). Flying The atmosphere of Duna might be thin, but on heights below 5 km it is thick enough that wings can generate enough lift to make aerodynamic flight possible. Jet engines don't work due to lack of oxygen, but other propulsion methods work well. Performing a horizontal landing with a plane is also possible. Starting An ascent to Low Duna Orbit from the surface typically requires around 1500 to 2000 m/s in Delta-V, leaving you in an orbit at 42km altitude traveling at roughly 950 m/s. The following table gives terminal velocities at different Duna altitudes. These are also the velocities at which a ship should travel for a fuel-optimal ascent from Duna, given the game's model of atmospheric drag.[2] Altitude (m) Velocity (m/s) 0 212 1000 231 2000 252 3000 274 5000 324 8000 418 10000 495 13000 638 15000 756 20000 1.16×103

Orbital Statistics

The geosynchronous orbit of Duna is at an altitude of 0.00 m above Duna. The speed of the satellite is 0.00 m/s and it has an orbital period resonating with 1 Duna day (18.2 hours or 65517.859375 seconds). However, this is the same altitude at which Ike orbits, so unless a ship's orbit is perfectly precise, it will eventually be captured by Ike.

For a semi-synchronous orbit of ½ Duna day (9.1 hours or 32758.9295 seconds) an orbit of 0.00 m above Duna is needed with a velocity of 0.00 m/s.

Interplanetary Travel

From altitude orbit around Duna, the amount of delta-V needed to reach the orbits of other celestials is as follows:

Reference Frames

Template:ReferenceFrames

Gallery

• 

  Parachute descent down to Duna surface.

• 

  ISA satellite in orbit over Duna being used to map the planet surface.

• 

  Duna's surface at Dawn.

• Duna projection.png

  A false color Mercator projection of Duna's surface using MapSat.

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  Duna and Ike.

• 

  A topographic height map of Duna made with the ISA MapSat plugin

• 

  A color map of Duna

Changes

0.18

• Minor art pass

0.17

• Initial Release

Trivia

• Duna's name may be either a reference to its desert landscape or a shout-out to the Frank Herbert novel Dune.
• The low-lying areas near Duna's equator make a shape resembling Europe.

Notes

1. ↑ A nuclear engine has a specific impulse of 220 in 1 atm, 800 in vacuum, and the following at various Duna altitudes:

   altitude (m)	2	100	300	500	1460	2420	3000	4272	5000	10000
   specific impulse	684.1	687.8	695.1	701.8	728.7	748.2	757.3	772.1	778.1	795.9

2. ↑ http://forum.kerbalspaceprogram.com/showthread.php/6664-Mini-challenge-max-altitude-with-this-supplied-spacecraft?p=100912&viewfull=1#post100912

v t e Kerbol System Kerbol Moho Eve Kerbin Duna Dres Jool Eeloo (The Sun)   Gilly Mun Minmus Ike   Laythe Vall Tylo Bop Pol