Difference between revisions of "Laythe"

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{{:Laythe/Data}}
  
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'''Laythe''' is the first of the five [[w:Natural satellite|natural satellites]] of [[Jool]]. Although mostly covered in seas, Laythe has numerous rocky, sandy islands. Laythe is tidally locked to Jool.  Synchronous orbits around Laythe are not possible, as they would lie outside of its SOI, at a radius of 5,186,399 meters. A circular [[w:archipelago|archipelago]] that is prominent in maps suggests that Laythe suffered a massive impact in its distant past.
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Achieving a stable orbit around  from sea level requires a [[delta-V]] of ≈2800 m/s.
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Laythe's real world analogue is[[w:Europa (moon)|Europa]]. In the real-world [[w:Jupiter|Jupiter system]], the moons [[w:Ganymede (moon)|Ganymede]], [[w:Europa (moon)|Europa]] and [[w:Io (moon)|Io]] form a group with an [[w:Orbital Resonance|orbital resonance]] just like KSPs [[Tylo]], [[Vall]] and Laythe. But while Tylo and Vall have a certain resemblance to their real-life counterparts, Laythe is very unlike the volcanic, atmosphere-less, dry Io. Though Laythe has liquid water on its surface, the temperature there is below 0 degrees Celsius. This means that Laythe's oceans must contain another compound, most likely ionic, such as salt.
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According to developer NovaSilisko, Laythe is planned to have volcanic, probably cryovolcanic, activity and high radiation levels in later versions, making it a much more hostile moon than now ({{Check version|0.21.1}}).<ref>[http://forum.kerbalspaceprogram.com/showthread.php/28451-Could-Laythe-actually-exist-with-real-physics?p=349683&viewfull=1#post349683 Forumpost from NovaSilisko]</ref><ref>[http://forum.kerbalspaceprogram.com/threads/29807-Planet-Ideas-And-Names-For-The-Future-Of-Kerbal-Space-Program?p=447959&viewfull=1#post447959 Post from NovaSilisko]</ref>
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== Atmosphere ==
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Laythe's [[atmosphere]] begins at 55,262 meters and is slightly thicker than Kerbin's. It is the only moon in the game which has an atmosphere.
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Like all other atmospheres in the game, Laythe's atmosphere fades exponentially with increasing altitude (with a scale height of 4000 m). In general, the atmospheric pressure on Laythe at an altitude expressed in meters is:<ref>A [[LV-N Atomic Rocket Engine]] has a specific impulse of 220 in 1 atm, 800 in vacuum, and the following at various Laythe altitudes:
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{| class="wikitable"
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| altitude (m)    ||  600 ||  1464 ||  1800 ||  2238 ||  2698 ||  3296 ||  4104 || 16435
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|-
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| specific impulse || 400.7 || 478.2 || 504.2 || 534.8 || 563.7 || 596.5 || 633.7 || 792.4
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|}</ref>
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:<math>p_l = 0.8\ e^{-altitude/4000}</math>
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With proper [[aerobraking]] near Laythe and Jool, reaching Laythe may require the least delta-V of all of Jool's moons. When approaching Jool on a Hohmann transfer orbit from Kerbin, aerobraking with a Jool periapsis of 119.5 km will put your apoapsis roughly near Laythe's orbit.
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Landing on higher points of Laythe's surface has to be done with a help of retro burns as parachutes alone are not enough to sufficiently lower velocity for landing.
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Jet engines work in Laythe's atmosphere as it contains oxygen. However, their air intake efficiency is lower.
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== Reference Frames ==
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{{:Laythe/RefFrame}}
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== Gallery ==
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<gallery>
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Mechjeb Laythe.png        | A large user-created probe in low orbit around Laythe.
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ProbeonLaythe.png          | A probe on the surface of Laythe.
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Laythe Topo compressed.png | A topographic map of Laythe made with ISA MapSat.
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Laythe bump gray.jpg      | A grayscale bump map normalized at sea level.
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File:KSP.EXE 0x69D82224.png| A color map of Laythe
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VallFromLaythe.png        | Vall as seen on Laythe
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TyloFromLaythe.png        | Tylo as seen on Laythe
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BopFromLaythe.png          | Bop as seen on Laythe
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Laythetransen.svg          | Laythe transfer plan
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Laythe_map_800.gif        | A topographic height map of Laythe as at Version 0.18.2 made with the ISA MapSat plugin
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Laythe_Ice_Cap.png        | Laythe's northern ice cap, with the Sun, Vall, and Tylo.
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Jet_on_Laythe.png          | User-created jet flying in Laythe's atmosphere.
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TogsSpaceplace1.jpg        | User-created jet space plane on re-entry to Laythe.
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</gallery>
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== Changes ==
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;{{Version|0.17|}}
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* Initial Release
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== Notes ==
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<references />
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{{Celestial Bodies}}
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[[Category:Celestials]]
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[[Category:Moons]]

Revision as of 22:29, 28 September 2013

Laythe/Data

Laythe is the first of the five natural satellites of Jool. Although mostly covered in seas, Laythe has numerous rocky, sandy islands. Laythe is tidally locked to Jool. Synchronous orbits around Laythe are not possible, as they would lie outside of its SOI, at a radius of 5,186,399 meters. A circular archipelago that is prominent in maps suggests that Laythe suffered a massive impact in its distant past.

Achieving a stable orbit around from sea level requires a delta-V of ≈2800 m/s.

Laythe's real world analogue isEuropa. In the real-world Jupiter system, the moons Ganymede, Europa and Io form a group with an orbital resonance just like KSPs Tylo, Vall and Laythe. But while Tylo and Vall have a certain resemblance to their real-life counterparts, Laythe is very unlike the volcanic, atmosphere-less, dry Io. Though Laythe has liquid water on its surface, the temperature there is below 0 degrees Celsius. This means that Laythe's oceans must contain another compound, most likely ionic, such as salt.

According to developer NovaSilisko, Laythe is planned to have volcanic, probably cryovolcanic, activity and high radiation levels in later versions, making it a much more hostile moon than now (0.21.1[outdated]).[1][2]

Atmosphere

Laythe's atmosphere begins at 55,262 meters and is slightly thicker than Kerbin's. It is the only moon in the game which has an atmosphere.

Like all other atmospheres in the game, Laythe's atmosphere fades exponentially with increasing altitude (with a scale height of 4000 m). In general, the atmospheric pressure on Laythe at an altitude expressed in meters is:[3]

With proper aerobraking near Laythe and Jool, reaching Laythe may require the least delta-V of all of Jool's moons. When approaching Jool on a Hohmann transfer orbit from Kerbin, aerobraking with a Jool periapsis of 119.5 km will put your apoapsis roughly near Laythe's orbit.

Landing on higher points of Laythe's surface has to be done with a help of retro burns as parachutes alone are not enough to sufficiently lower velocity for landing.

Jet engines work in Laythe's atmosphere as it contains oxygen. However, their air intake efficiency is lower.

Reference Frames

Time warp Minimum Altitude
1× Any
5× 50 000 m (above the atmosphere)
10× 50 000 m (above the atmosphere)
50× 60 000 m
100× 120 000 m
1 000× 240 000 m
10 000× 480 000 m
100 000× 600 000 m

Gallery

  • A large user-created probe in low orbit around Laythe.

  • A probe on the surface of Laythe.

  • A topographic map of Laythe made with ISA MapSat.

  • A grayscale bump map normalized at sea level.

  • A color map of Laythe

  • Vall as seen on Laythe

  • Tylo as seen on Laythe

  • Bop as seen on Laythe

  • Laythe transfer plan

  • A topographic height map of Laythe as at Version 0.18.2 made with the ISA MapSat plugin

  • Laythe's northern ice cap, with the Sun, Vall, and Tylo.

  • User-created jet flying in Laythe's atmosphere.

  • User-created jet space plane on re-entry to Laythe.

Changes

0.17
  • Initial Release

Notes

  1. ↑ Forumpost from NovaSilisko
  2. ↑ Post from NovaSilisko
  3. ↑ A LV-N Atomic Rocket Engine has a specific impulse of 220 in 1 atm, 800 in vacuum, and the following at various Laythe altitudes:
    altitude (m) 600 1464 1800 2238 2698 3296 4104 16435
    specific impulse 400.7 478.2 504.2 534.8 563.7 596.5 633.7 792.4
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