Difference between revisions of "Eve"

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(→‎Natural Satellites)
(→‎Atmosphere: Add a table of terminal velocities at 10 different altitudes.)
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[[File:Atmosphere_kerbin_eve.png|thumb|right|A comparison of the atmospheres of Eve and Kerbin]]
 
[[File:Atmosphere_kerbin_eve.png|thumb|right|A comparison of the atmospheres of Eve and Kerbin]]
  
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Eve's [[atmosphere]] begins at 97,500m. It fades exponentially with increasing altitude, as do the atmospheres of Kerbin and Duna, but it is a very thick atmosphere; 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.
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Eve's [[atmosphere]] begins at 97,500 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.
  
 
In general, the atmospheric pressure on Eve at an altitude expressed in meters is:<ref>A [[LV-N Atomic Rocket Engine|nuclear engine]] has a specific impulse of 220 in 1 atm or higher, 800 in vacuum, and the following at various Eve altitudes:
 
In general, the atmospheric pressure on Eve at an altitude expressed in meters is:<ref>A [[LV-N Atomic Rocket Engine|nuclear engine]] has a specific impulse of 220 in 1 atm or higher, 800 in vacuum, and the following at various Eve altitudes:
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: <math>p_e = 5\ e^{-altitude/7000}</math>
 
: <math>p_e = 5\ e^{-altitude/7000}</math>
  
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One observed deceleration profile is: 130 m/s at 11 KM, 110 m/s at 8.5 KM, 100 m/s at 7.5 KM, 90 m/s at 6 KM, 80 m/s at 4.3 KM.
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From within Eve's atmosphere, the sky appears indigo during nighttime. During dawn and dusk, the sky is green. The atmosphere is possibly composed of iodine, given its purple coloration.
  
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From within Eve's atmosphere, the sky appears indigo during nighttime. During dawn and dusk, the sky is green. The atmosphere is possibly composed of iodine, given its purple coloration.
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Jet engines do not function in Eve's atmosphere, since it contains no oxygen &mdash; they make noise and consume fuel, but they produce no thrust.
  
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Jet engines function in Eve's atmosphere, to the extent of making noise and consuming fuel, but do not produce useful thrust, due to lack of oxygen to burn.
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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.<ref>http://forum.kerbalspaceprogram.com/showthread.php/6664-Mini-challenge-max-altitude-with-this-supplied-spacecraft?p=100912&viewfull=1#post100912</ref>
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{| class="wikitable"
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|-
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! Altitude (m) !! Velocity (m/s)
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|-
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|    0 || {{sigfigs|{{VT|planet=Eve|alt=0}}|3}}
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|-
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|  1000 || {{sigfigs|{{VT|planet=Eve|alt=1000}}|3}}
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|-
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|  5000 || {{sigfigs|{{VT|planet=Eve|alt=5000}}|3}}
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|-
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| 10000 || {{sigfigs|{{VT|planet=Eve|alt=10000}}|3}}
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|-
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| 15000 || {{sigfigs|{{VT|planet=Eve|alt=15000}}|3}}
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|-
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| 20000 || {{sigfigs|{{VT|planet=Eve|alt=20000}}|3}}
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|-
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| 30000 || {{sigfigs|{{VT|planet=Eve|alt=30000}}|3}}
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|-
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| 40000 || {{sigfigs|{{VT|planet=Eve|alt=40000}}|3}}
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|-
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| 50000 || {{sigfigs|{{VT|planet=Eve|alt=50000}}|3}}
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|-
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| 60000 || {{sigfigs|{{VT|planet=Eve|alt=60000}}|3}}
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|}
 
|}
 
|}
  

Revision as of 19:43, 5 November 2012

Template:Planetbox

Eve is the second planet from Kerbol and is the second largest body orbiting it. It is purple in appearance. It has one small moon, a captured asteroid called Gilly.

Eve is the closest planet to Kerbin and the easiest to reach, requiring the least Delta-V of any planet. Having a similar size to Kerbin gives it a large gravity well, and a thick atmosphere makes landings easier, while making departure more difficult.

Topography

A topographic map of Eve made with the ISA MapSat plugin

Eve has several oceans and large, flat continents with a few mountain peaks. There is a distinctly large crater in the western hemisphere. The surface looks like purple sand dunes.

Atmosphere

A comparison of the atmospheres of Eve and Kerbin

Eve's atmosphere begins at 97,500 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.

In general, the atmospheric pressure on Eve at an altitude expressed in meters is:[1]

From within Eve's atmosphere, the sky appears indigo during nighttime. During dawn and dusk, the sky is green. The atmosphere is possibly composed of iodine, given its purple coloration.

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.

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.[2]

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

Natural Satellites

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

Orbital Statistics

The geosynchronous orbit of Eve is at an altitude of 10373.195 km above Eve. The speed of the satellite is 858.95 m/s and it has an orbital periode resonating with 1 Eve day (22.5 hours or 81000 seconds.) 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

Rotational/Inertial transition: 100,000? m

Warp Minimum Altitude
1x 0 m
5x 30,000 m
10x 30,000 m
50x 60,000 m
100x 120,000 m
1,000x 240,000 m
10,000x 480,000 m
100,000x 600,000 m


Gallery

  • Orbiting Eve

  • Eve sky surface.png

    Eve's sky at the surface.

  • Eve and Gilly.

  • A topografic height map of Eve made with the ISA MapSat plugin

Changes

0.17
  • Initial Release

Notes

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


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