Unimplemented Content

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The following is a list of content that was stated at one point by a developer to be planned to be added to Kerbal Space Program, but was never implemented into the game.

New Celestials

Xubol

A near-molten ball of salt and sand, Xubol was to be the first planet of the Kerbol System.[1]

  • Radius: 200 kilometers
  • Rotation period: 2.5 hours
  • Atmospheric density: 0.005 kb (kb = Kerbal Bars, equal to Kerbin's atmospheric pressure at sea level)
  • Surface gravity: 0.2 g
  • Semimajor Axis: 2,243,970 kilometers
  • Inclination: n/a
  • Eccentricity: 0.425

Faz and Jall

Planned moons of Eve.

  • Faz was to have a 30km radius and 3,000km semimajor axis.
  • Jall was to have a 200km radius and 8,000km semimajor axis.

Rupa

Rupa, a planned moon of Kerbin with a 60km radius and 30,500km semimajor axis, was revised to become Minmus.

Meander

A brilliant green gas planet, worshiped in years past as the god which created Kerbal-kind. Revised to become Jool.

  • Radius: 2,700 kilometers
  • Rotation period: 8.5 hours
  • Atmospheric density: 15.0 kb (at 50 km down)
  • Semimajor Axis: 19,447,740 kilometers
  • Inclination: n/a
  • Eccentricity: n/a

Moons:

  • Haqua (150km, 6,350km)
  • Egar: The second-largest moon of Meander, Egar is an interesting contrast. Half icy wasteland, half desert - enormous polar ice caps dominate this moon. Revised to become Duna.
    • Radius: 350 kilometers
    • Rotation period: Tidally locked
    • Atmospheric density: 0.025 kb
    • Surface gravity: 0.7 g
    • Semimajor Axis: 13,500 kilometers
    • Inclination: n/a
    • Eccentricity: n/a
  • Lumowan (400km, 25,800km)
  • Minor moons: 20+

Toshakona Belt

A ring of debris large and small stretching from just outside Meander's orbit to just inside that of Juniper.

Sothebin

Upon discovery it was touted as a 'Second Kerbin' - but that frenzy died down quickly after discover that the dark patches on its surface were dried basaltic lava, not oceans.

  • Radius: 720 kilometers
  • Rotation period: 9 hours
  • Atmospheric density: 0.8 kb
  • Semimajor Axis: 28,423,620 kilometers
  • Inclination: 0.35 °
  • Eccentricity: 0.09
  • Surface gravity: 3.4 g

Juni

The largest of the planets, Juni was also to boast the largest ring system and most moons.

  • Radius: 5,800 kilometers
  • Rotation period: 9 hours
  • Atmospheric density: 80 kb (at 50 km down)
  • Semimajor Axis: 28,423,620 kilometers
  • Inclination: 0.35 °
  • Eccentricity: 0.09

Moons:

  • Gax (230km, 34,400km)
  • Tiberius
  • Minor moons: 30+
  • Junimu: The largest known moon, and the only one with a ring system of its own, composed mostly of material stolen from the main rings of Juni.
    • Radius: 600 kilometers
    • Rotation period: 4.5 hours
    • Atmospheric density: 0.8 kb
    • Surface gravity: 0.8 g
    • Semimajor Axis: 59,000 kilometers
    • Inclination: n/a
    • Eccentricity: n/a

Mandrake & Rutherford

Mandrake and Rutherford were to be two brilliant blue gas planets orbiting one another, named for their siamese twin discoverer(s), Mandrake & Rutherford Kerman. How they formed is unknown, as is how long this configuration will last.

  • Radius: 3,100 kilometers & 2,900 kilometers respectively
  • Rotation period: Tidally locked
  • Atmospheric density: 20 kb (at 50 km down)
  • Orbital parameters (around Kerbol):
    • Semimajor Axis: 67,663,175 kilometers
    • Inclination: 1.5 °
    • Eccentricity: 0.015
  • Orbital parameters (around the other planet):
    • Semimajor Axis: 38,500 kilometers
    • Inclination: n/a
    • Eccentricity: n/a

Harvest

A reddish-brown miniplanet sharing Kerbin's orbit, occupying its L4 Lagrange Point.

  • Radius: 80 kilometers
  • Rotation period: 5 hours
  • Atmospheric density: n/a
  • Surface gravity: 0.02 g
  • Semimajor Axis: 13,680,255 kilometers
  • Inclination: n/a
  • Eccentricity: n/a

Ralph

An icy body, situated between Meander and Juniper.

  • Radius: 110 kilometers
  • Rotation period: 24 hours
  • Atmospheric density: n/a
  • Surface gravity: 0.12 g
  • Semimajor Axis: 37,399,500 kilometers
  • Inclination: 8.6 °
  • Eccentricity: 0.15

Moons:

  • Ralph Jr.(10km, 550km)

Gas planet 2

~50% larger than Jool, with rings.[2]

  • Eeloo: Relocated to orbit GP2, now with large geysers that can knock ships around.
  • Daphy: Unusually smooth and round ball of fluff. An asteroid which has accumulated material from the rings, practically no gravity.
  • Potatus: Small moon with relatively high inclination relative to GP2's equator. Composed of ices surrounding a highly dense core. Very rapid rotation (21 minutes) causes it to be stretched into an oblate spheroid.
  • Fonso: Largest moon, ~300 km radius. Very mountainous, with a thick atmosphere that only extends partway up the mountains (the mountain peaks are in vacuum, while the proper surface is at two atmospheres).
  • Tiny moons: Same case as Jool.

Gas planet 3

Perhaps not an actual gas planet, could be a 2000km rocky planet with a thick atmosphere, with 6g and 30 atmospheres of pressure at the surface.

  • Possible moon with rings, would have to be diffuse rings as well as recent, fully-formed rings wouldn't last long in that position.

Mez

Super-Kerbin with rapid rotation period, somewhat lens-shaped as a result.

  • Thick atmosphere
  • Gravity at poles approaches 10-20g, gravity at equator only ~0.05g.
  • Scale height of atmosphere varies accordingly, and grows very diffuse and stretched around the equator.

Miscellaneous

  • Low-density belt of vulcanoid asteroids below the orbit of Moho.[3]
  • Asteroids discoverable in the actual asteroid belt, along with a significant quantify of larger asteroids.
  • Additional gas planets beyond the third one.
  • Extra bodies with analogues of most real-world dwarf planets (especially Sedna).

Changes to Existing Celestials

Eve

  • Inclination reduced to make an easier early-game interplanetary target.
  • Hotter and generally more angry atmosphere on Eve.
  • Not as purple.
  • Perpetual clouds and heavy haze, thunder ambiance, flashes of lightning and a surface dark enough to require lights to see properly (except when the lightning is going).

Kerbin

  • Small amounts of eccentricity and inclination.

Mun

  • More realistic crater distribution in both size and location.
  • Tycho crater ripoff with properly shaped solid-black monolith.

Duna

  • More, flatter lowlands, more obvious ancient water-carved features.
  • More irregular ice caps with "super cool" features.
  • An additional asteroidal moon, far beyond Ike, if the systems allowed it it would have irregular rotation like Pluto's small moons are expected to (due to the odd dynamics of a binary planet system).

Ike

  • Return of the magic boulder.
  • Craters and a more moon-like heightmap.

Jool

Actually the second-smallest gas giant, with unusually large moons. All other gas giants would have objects smaller than or comparable to Moho.

  • Re-arrangement of major moons to be more widely spaced and similar to Saturn's layout of moons.
  • 150% its original size, with enlarged moon orbits as well.
  • Not so green, perhaps green bands instead, which when sampled yield algae.
  • Oblateness similar to that of Saturn's or Jupiter's (would require reworking of how atmospheres are handled).
  • More tiny moons: Just a bunch of small moonlets, at least 20. Probably would be nameable by the player or given designations (ex. J-17 for the 17th moon of Jool discovered).

Laythe

  • Very volcanic because of its proximity and the tidal forces from the other moons. Still oceans of water, but now with actual active volcanos with lava lakes (that destroy things).
  • Smaller, Duna sized.
  • Mostly cloud covered.
  • No ice caps (hot greenhouse atmosphere would destroy them easily).
  • Faint torus of gas along its orbit from escaping atmosphere (not enough to affect ships, but enough to catch the light, as in Saturn's E ring (possibly enough to change orbits using aerodynamic surfaces).

Vall

  • More like eeloo, with large cracks in the ice and a more chaotic surface.
  • Smaller, Mun sized.

Tylo

  • Perhaps turned into a highly-contrasting body like Iapetus.
  • Smaller, slightly below Duna sized.
  • Two-thirds-gee surface gravity (High for a body of that size, so perhaps a dense iron core surrounded by ices; a body from the inner solar system that was ejected and then captured by Jool).
  • Ice geysers + resulting atmosphere.
  • Second faint gas torus.

Eeloo

  • Surface like Pluto with "flowy stuff".
  • Small blob of a moon.

Technical advances

  • Functional atmospheres for non-spherical bodies.
  • Proper altitude detection for non-spherical bodies.
  • Non-spherical atmosphere rendering.
  • Gas torus rendering.
  • Dynamic loading/unloading of planet surface maps to keep memory usage sane (or just 64-bit and deal with the inefficiency).
  • Ambient sound system for planets.
  • Irregular planetary rotation (optional, for Duna's minimoon).
  • Clouds.

Gallery

References