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| − | {{Infobox/Body}}
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| − | '''Ike''' is a [[moon]] and the only [[w:natural satellite|natural satellite]] of [[Duna]]. Ike has steep, rocky slopes and no atmosphere. Ike and Duna are tidally locked due to their proximity and Ike's size. This means that Ike is in synchronous orbit around its parent body, and that each body is only visible from approximately half of its partner's surface. (It would be exactly half, but Ike's slightly eccentric orbit creates regions for which Ike can be seen to set and rise. See Libration, below). It is the largest among planetary satellites relative to the size of the planet that it orbits in the Kerbol system.
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| − | An encounter with Ike is quite likely when approaching Duna, provided the player's trajectory is near the plane of Ike's orbit. This is because Ike's sphere of influence is very high relative to the semi-major axis of its orbit — in fact, no other moon in the game has a larger SOI-to-semi-major-axis ratio<!--
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| − | Gilly: 0.00400391333
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| − | Mun: 0.20246325833
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| − | Minmus: 0.04781762553
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| − | Ike: 0.32799965625
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| − | Laythe: 0.13697931872
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| − | Vall: 0.05576569800
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| − | Tylo: 0.15848931387
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| − | Bop: 0.00950241914
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| − | --> and no other moon is as close in mass to its parent – Ike has about 16% the mass of Duna.
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| − | Stationary orbit around Ike is not possible — it would require an altitude of
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| − | {{OrbitAltitude|b=Ike|f=k}}, outside of Ike's sphere of influence. However, since Ike and Duna are tidally locked to each other, a spacecraft in stationary orbit around Duna will see Ike in a near stable, non-rotating position, as if it were in a stationary Ike orbit. It is not perfectly stationary as Ike has both a non-zero orbital eccentricity and a very small orbital inclination.
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| − | Although Duna is the game analog for Mars, Ike does not seem to represent Phobos or Deimos. The Duna-Ike system could be interpreted as an analog of Pluto-Charon – in the real solar system, no moon has a mass as similar to its parent body as Ike.
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| − | == In-game Description ==
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| − | {{Quote
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| − | |Ike is a relatively large, grey object occasionally seen orbiting Duna. <br><br> Scientists have postulated that Ike is seemingly perfectly positioned to sneakily interfere with any object that presumes to come orbiting near its parent.
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| − | |[[Kerbal Astronomical Society]]}}
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| − | == Geostationary properties and libration ==
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| − | <!--[[File:Ikes libration.gif|thumb|left|An animation of an orbit viewed from Duna (thumbnail is currently not working)]]-->
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| − | 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 [[w:Zenith|Zenith]]) is 3 degrees east, but the exact longitude oscillates between about 0 degrees and 6 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 [[w:Libration|libration]]. Due to the oscillation in Ike's position above the horizon, areas from 90°W to 84°W and 90°E to 96°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
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| − | Traveling from a 50 km Duna orbit to a 10 km Ike orbit requires approximately 435 m/s of delta-V.
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| − | <!--
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| − | Ike orbits 3200 km above Duna's center, or 2880 km above Duna's surface. Turning a 50x50 km Duna orbit (speed: 902.5 m/s) into a 50x2880 km one (periapsis speed: 1208.4 m/s) requires a burn of 305.9 m/s. Assuming the ship enters Ike's SOI with a speed of 100 m/s and a periapsis of 10 km, turning this into a 10x10 km Ike orbit requires requires a burn of 125.6 m/s at periapsis. Total: 305.9 + 125.6 = 431.5 m/s.
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| − | Source: https://github.com/numerobis/KSP-scripts/blob/master/planet.py
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| − | > from planet import *
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| − | > ike.soiBurn(10000, 100) # first argument is periapsis (in meters), second is speed on exiting SOI
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| − | The return trip requires the same two burns, reversed -- one burn to escape Ike's SOI, the second to circularize around Duna -- but [[aerobraking]] around Duna can greatly reduce the 305.9 m/s cost of the circularization burn.
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| − | -->
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| − | == Topography ==
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| − | Ike is extremely rocky. Its tallest points are 12.75 km above its lowest, giving it an elevation range over 3 times that of the [[Mun]]<!--3.34 km--> despite the fact that the Mun has a 54% wider radius and 137% more surface area. The increased elevation and smaller size result in many steep slopes and make landing quite difficult. The bottoms of valleys are among the flatter, safer landing locations.
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| − | Ike lacks any visible impact craters. This is strange considering that it has no atmosphere and isn't much smaller than the [[Mun]] which has plenty of craters.
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| − | The ground is dark grey, notably darker than that of other rock moons like [[Mun]], and sprinkled with large rocks when terrain scatters are on. Sometimes the ground doesn't reflect sunlight, which generates an effect where if someone is looking at the ground, it seems to be nighttime; only looking up shows that it is actually daytime.
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| − | == Biomes==
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| − | Ike has 8 [[biome]]s. It is one of three bodies (the other being [[Moho]] and [[Kerbin]]) that has their own North and South Pole biome.
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| − | === Biome list ===
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| − | {{Biome list|
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| − | * Polar Lowlands
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| − | * Midlands
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| − | * Lowlands
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| − | * Eastern Mountain Ridge
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| − | * Western Mountain Ridge
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| − | * Central Mountain Range
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| − | * South Eastern Mountain Range
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| − | * South Pole}}
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| − | == Easter Eggs ==
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| − | {{SpoilerBox
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| − | |description= Reference to do not taunt with the happy play ball
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| − | |content= Before 0.18, there was a boulder locked in a polar orbit, roughly 100 cubic meters, with green bands and a monolith. It had no gravitational pull (and was not affected by gravity). It had a flawed collision box, so an attempted landing always resulted in an explosion of some kind. It was called 'The Magic Boulder' which was its official name as shown in the log entry "Ship crashed into magic boulder". [http://www.youtube.com/watch?v=WJBSea-3DHs An example video] has been made by YouTuber Scott Manley, who maintained a distance of 8 meters long enough to give viewers an excellent picture of the object. Since 1.1.3, the Magic Boulder will instead randomly appear as a (purely cosmetic variation of) an [[asteroid]].}}
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| − | == Reference Frames ==
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| − | {{:Ike/RefFrame}}
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| − | == Gallery ==
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| − | <gallery>
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| − | File:Gravitational_Assist.png|A gravitational assist from Ike can help reduce descent velocity down to Duna's surface.
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| − | Ike_Eclipse.png | Ike eclipsing the sun as seen from Duna
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| − | Ike.png | Ike as seen in the Tracking Station
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| − | Ike-sky.png | Ike's sky, with [[Duna]] in it at all times as well as [[Kerbol]]
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| − | Ike-landing.png | A landing party on Ike's surface
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| − | File:PermafrostIkeLander.png | Small lander ascending from Ike.
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| − | IkeOrbit.png | Jebediah Kerman floating in front of a large spacecraft which is orbiting Ike. In the background you can see Duna.
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| − | Gui_Ike_ISA_Topo.png | Topographical map of Ike
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| − | Gui_Ike_Polars_Topo.png | Polar topographical map
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| − | Ike_map_800.gif | A topographic height map of Ike made with the ISA MapSat plugin
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| − | </gallery>
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| − | == Changes ==
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| − | ;[[0.90]]
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| − | * Added biomes
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| − | ;[[0.17]]
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| − | * Initial release
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| − | {{Celestial Bodies}}
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| − | [[Category:Celestials]]
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| − | [[Category:Moons]]
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