Duna/zh-cn

Duna/Data

Duna是Kerbol 星系中的第四颗行星。它实际上是火星在 Kerbal 太空计划中的化身，除了两极覆盖的极冠外都呈红色。它拥有一颗天然卫星，Ike卫星。由于 Ike 的体积和它的近距离轨道，Ike 是保持绕 Duna 同步自转的。

如果利用合适的气动减速手段，从 Kerbin 到 Duna 轨道的往返航程需要大约 1700 m/s 的delta-v，比去其他行星的旅程都要笑。由于其低轨道倾角，登陆 Duna 无疑是相对最容易的。

Topography

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 region with deep holes (some over 1km deep), which seem much too steep to be impact craters (maybe sinkholes?).

There are several maria (large regions of dark soil) at exactly 0 meters altitude. Their flatness and low altitude which allow 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:

$p_{d}=0.2\ e^{-altitude/3000}$

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.

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

Tracking Station Info

Also known as the red dot that you can see if you squint really hard, Duna has long been a wonder to Kerbalkind. The planet has been held in much awe, due to its striking red color and stark contrast to the color green.

Orbital Statistics

The geosynchronous orbit of Duna is at an altitude of 0.00 米 above Duna. The speed of the satellite is 0.00 米/秒 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 米 above Duna is needed with a velocity of 0.00 米/秒.

Observation of Ike

Ike's orbit keeps it directly above a short range of Duna longitudes. The average Duna longitude where Ike tends to stay directly above in the sky (at the Zenith) is 6 degrees east, but the exact longitude oscillates between about 2 degrees and 10 degrees east due to the eccentricity of Ike's orbit. This eccentricity also makes Ike appear to grow slightly larger and smaller to an observer on the surface of Duna. The latitude for which Ike is in the Zenith also oscillates between 0.2 degrees south and 0.2 degrees north due to Ike's orbital inclination, making Ike appear to rotate upwards and downwards as viewed from the surface, but due to the extremely small orbital inclination, this effect is nearly imperceptible. These phenomena together are known as libration. Due to the oscillation in Ike's position above the horizon, areas from 88°W to 80°W and 92°E to 100°E on Duna can observe Ike rise and set at least partially across the horizon, as can any areas north of 89.8°N or south of 89.8°S.

Interplanetary Travel

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

Body	Delta-V
Ike	~300 m/s
Kerbin	~620 m/s
Dres	~820 m/s
Eve	~1080 m/s
Jool	~1350 m/s
Eeloo	~1580 m/s
Moho	~2100 m/s

Reference Frames

时间加速	最低海拔
1×	所有
5×	50 000 米 (高于大气上限)
10×	50 000 米 (高于大气上限)
50×	60 000 米
100×	100 000 米
1 000×	300 000 米
10 000×	600 000 米
100 000×	800 000 米

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.

• 

  Duna and Ike.

• 

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

• 

  A color map of Duna

• 

  Duna at sunrise

• 

  A rover at the edge of one of the "sinkholes"

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.

Spoiler: Anomalous features

• On the surface of Duna, there is a large monument carved in the likeness of a Kerbal face, alluding to the infamous "Face of Mars" discovered in the Cydonia Mensae region of Mars during the 1970's.
• Buried deep under the surface, there is a small camera, similar to the design on the Pathfinder rover.
• One anomalous feature on Duna is a small, pyramid-like hill emitting an SSTV signal. When decrypted, it shows a diagram-like image of three figures standing next to the hill itself, implying that Duna was once inhabited or visited before.