Difference between revisions of "Eve"

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File:Eve_r0_1.png|A manned rover landing on the surface of Eve.
 
File:Eve_r0_1.png|A manned rover landing on the surface of Eve.
 
File:Skibladnir space shuttle.jpg|Skibladnir delivering two rovers to Eve
 
File:Skibladnir space shuttle.jpg|Skibladnir delivering two rovers to Eve
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File:EveAerobraking.png|A large spacecraft aerobraking in Eve's upper atmosphere.
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File:EveKerbonaut.png|Marc Kerman floating in front of a large interplanetary Eve ship.
 
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Revision as of 14:13, 26 June 2014

Eve/Data

Eve is the second planet from Kerbol, the closest planet to Kerbin, and KSP's analogue for the planet Venus. It has one small moon: a captured asteroid called Gilly.

In-game Description

Eve is certainly the purplest object in the solar system. Its one of the larger, most visible objects, mainly because of its very, very purple tint.

It is considered by some to be an almost sister planet to Kerbin. Well, despite the purple, and the toxic atmosphere, and the extreme pressures and temperatures… Actually, it’s not very similar at all is it? Who are these people?

Kerbal Astronomical Society

Topography

The surface of Eve looks not unlike that of Saturn's largest moon, Titan. It has several oceans, among which lie large, flat continents. The terrain has a few mountain peaks, but mostly consists of rolling hills that resemble purple sand dunes. These are speckled with small boulders, no doubt worn down by Eve's pressure, temperature, and wind. Eve's surface is covered with craters. The composition of the violet liquid which fills the oceans and lakes is unknown, although water remains a possibility: the boiling point of water is slightly higher than the surface temperature when taking the high atmospheric pressure into account.[1] According to the devs during a livestream, it was joked that the lakes were made of rocket fuel. Eve's highest mountain range has a peak of 7526 m.

Atmosphere

A comparison of the atmospheres of Eve and Kerbin

Eve's atmosphere begins at 96,708.6 m and is extremely dense: at 11,250 m, it's as thick as Kerbin's atmosphere at sea level (1 atm), and at Eve sea level the atmospheric pressure is 5 atm. Its atmospheric pressure fades exponentially, with a scale height of 7000 m. The atmosphere should be superheated due to the thick atmosphere trapping in heat, much like Venus, but this is not currently implemented.

In general, the atmospheric pressure on Eve at an altitude expressed in meters is:[2]

From within Eve's atmosphere, the sky appears indigo during nighttime and a violet-purple color during daytime. During dawn and dusk, the sky is green.

Jet engines do not function in Eve's atmosphere, since it contains no oxygen — they make noise and consume fuel, but they produce no thrust. Planes with other propulsion methods do, however, work very well, and are a great way to explore the planet. They work best between 35 km and 25 km where the atmosphere generates enough lift to glide and steer, but not enough drag to slow the aircraft excessively.

Landing legs on Eve can easily break because of Eve's high gravity and, surprisingly enough, atmospheric pressure.

As with version 0.17.1[outdated], an aerobraking maneuver arriving from Kerbin and resulting in orbit around Eve - without using fuel for braking - can be done aiming for a periapsis at approximately 72,500 m. In rare cases, retracted solar panels may still be destroyed by Eve's atmosphere.

The following table gives terminal velocities at different Eve altitudes. These are also the velocities at which a ship should travel for a fuel-optimal ascent from Eve, given the game's model of atmospheric drag.[3]

Altitude (m) Velocity (m/s)
0 58.4
1000 62.5
5000 82.0
10000 115
15000 162
20000 228
30000 450
40000 888
50000 1.76×103
60000 3.47×103

Science

Eve's orbit and atmosphere have a science multiplier of 7, which is rather average. But the surface has a multiplier of 12, which is the highest science multiplier in the whole star system.

Eve has no biomes, only the default "global" context for science activities. Some players have mistaken the difference in results given when in water and the header "from Eve's oceans" for a second biome, but this is default terminology coded for a "SrfSplashed" splashdown situation also seen on Laythe.

Natural satellites

Eve's only natural satellite is the tiny captured asteroid Gilly in a highly eccentric and inclined orbit. Gilly is the smallest celestial body in the Kerbol system.

Orbital statistics

Visiting Eve potentially requires the least delta-v of any planet because its huge gravity well and dense atmosphere mitigate the difficulties that its slight relative inclination poses and greatly ease aero-captures, transfers, and landings; unfortunately, takeoff and escape therefore require the most delta-v of any celestial body with a solid surface.

The combination of high gravity and thick atmosphere makes return missions from the sea level of Eve very difficult. It requires about 11,500 m/s of delta-v to get into orbit from sea level. Driving to and launching from the peak of one of Eve's mountains can drastically reduce the amount of delta-V required (thus allowing successful launches with significantly lighter rockets). The highest peak on Eve since version 0.21.1 is 7540 m high, found near (25° S, 158.5° W)

Altitude (m) Delta-V Required (m/s)
0 11,282
1000 10,731
2000 10,219
3000 9,743
4000 9,300
5000 8,888
6000 8,507
7000 8,150
7540 7,968

A synchronous orbit of Eve requires an altitude of 10373.195 km and a velocity of 858.95 m/s. For a semisynchronous orbit of ½ Eve day (11.25 hours or 40500 seconds) an orbit of 6275.676 km above Eve is needed with a velocity of 1082.2 m/s.

Reference Frames

Time warp Minimum Altitude
Any
5× 90 000 m (above the atmosphere)
10× 90 000 m (above the atmosphere)
50× 90 000 m (above the atmosphere)
100× 120 000 m
1 000× 240 000 m
10 000× 480 000 m
100 000× 600 000 m


Gallery

Bugs

  • Eve has higher gravity than Kerbin, restricting a Kerbal's jump to only half a meter and making EVA jets useless. This being said, if a Kerbal falls from more than 4 m, they will hit the ground much harder than on Kerbin, which may cause a glitch to happen in which they will clip into the terrain and accelerate away from Eve at phenomenal speed, sometimes faster than the speed of light itself, usually sending the unlucky Kerbal on an escape trajectory from Kerbol if they are not killed by the fall. They may bring something into interstellar space with them if they hit an object instead of the ground.
  • Solar panels will probably break off in flight, even with very low velocity. It's best to wait to extend them till stable on the surface, however they can break on the surface of Eve even when retracted. This may be due to Eve's high gravity.
  • Rovers can be challenging to drive on Eve due to its gravity. The rover's wheels will easily break, but on the upside, since the gravity pulls them lower on their shocks and thus lowers the centre of mass, they will be harder to flip over. Although not a glitch, it could cause clipping issues with a kerbals sitting in EAS-1 External Command Seats
  • When landing fast, craft will sometimes sink into the surface of Eve. This can be fixed by using landing legs to lift the ship up.

Changes

0.21
  • Terrain Tweaks — more land mass to the surface
0.18
  • Art pass.
  • Terrain tweaks — the tallest points are now about 6 km in altitude, compared to 11 km before.
0.17
  • Initial Release

Notes

  1. According to WolframAlpha the boiling temperature is about 2.5 K higher than the highest temperature measured.
  2. A nuclear engine has a specific impulse of 220 in 1 atm or higher, 800 in vacuum, and the following at various Eve altitudes:
    altitude (m) 11263 11268 11322 11598 11896 12200 12799 13868 14586 15292 16725 18711 22800 23556 32000 38000 43000 51963
    specific impulse 220 220.2 224.6 246.9 269.9 292.4 334.0 400.0 438.8 473.4 533.7 600.2 688.2 699.8 769.8 787.3 793.8 798.3
  3. http://forum.kerbalspaceprogram.com/showthread.php/6664-Mini-challenge-max-altitude-with-this-supplied-spacecraft?p=100912&viewfull=1#post100912