Unimplemented Content

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.

• 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.
  • 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.

• 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.
• 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.