Gilly - Kerbal Space Program Wiki (2024)


Gilly as seen from orbit.
Moon of Eve
Orbital Characteristics
Semi-major axis 31 500 000m [Note 1]
Apoapsis 48 825 000m [Note 1]
Periapsis 14 175 000m [Note 1]
Orbital eccentricity 0.55
Orbital inclination 12°
Argument of periapsis 10°
Longitude of the ascending node 80°
Mean anomaly 0.9rad (at 0s UT)
Sidereal orbital period 388 587s
17d 5h 56m 27.4s
Synodic orbital period 417 243.4s
Orbital velocity 274 - 945m/s
Longest time eclipsed 5 102s
Physical Characteristics
Equatorial radius 13 000m
Equatorial circumference 81 681m
Surface area 2.1237166×109m2
Mass 1.2420363×1017kg
Standard gravitational parameter 8 289 449.8m3/s2
Density 13 496.328kg/m3
Surface gravity 0.049m/s2 (0.005g)
Escape velocity 35.71m/s
Sidereal rotation period 28 255.000s
1d 1h 50m 55s
Sidereal rotational velocity 2.8909m/s
Synchronous orbit 42.14km
Sphere of influence 126 123.27m [Note 1]
Atmospheric Characteristics
Atmosphere present No
Scientific multiplier
Surface 9
Splashed N/A
Near space 8
Outer space 6
Recovery 6
  1. 1.0 1.1 1.2 1.3 The distances are given from the body's center, not from the surface (unlike ingame)

Gilly is a tiny asteroid, the only natural satellite of Eve, and the smallest celestial body in the Kerbol system.


  • 1 In-game Description
  • 2 Topography
  • 3 Biomes
    • 3.1 Biome list
  • 4 KSP2
    • 4.1 Surface Research Locations
    • 4.2 Maps
      • 4.2.1 Biomes
      • 4.2.2 Visual map
  • 5 Gravity
  • 6 Landing
  • 7 Reference Frames
  • 8 Gallery
  • 9 Trivia
  • 10 Changes

In-game Description

KSP 1:

Gilly is a lumpy rock wandering around the orbit of Eve. It’s by far the smallest natural satellite that the Kerbal Astronomical Society has discovered.
Due to the large amount of squinting and eye strain associated with its discovery, wearing glasses has now become synonymous with being an accomplished Astronomer.''

Kerbal Astronomical Society

KSP 2:

Gilly is the smallest celestial body in the Kerbollar system. In fact, it took years to officially discover because researches mistook it for a crumb on their telescope lenses. Its gentle gravitational pull and lack of atmosphere often leads to objects bouncing off its surface and back into orbit around Eve. Please be cautious when taking brisk walks.


A topographic map of Gilly.

The surface of Gilly is extremely dynamic and uneven, with many steep slopes and smooth areas. This moon is considered a captured asteroid. Gilly has the lowest mass and gravitational force of any body in the Kerbol system. Due to its minuscule mass and resultant low gravitational force, it does not have an atmosphere.

Gilly's color might come from a high content of solid carbon. When terrain scatters are enabled in the settings menu, small rocks will show up on the surface.


With only 3 biomes, Gilly has the fewest number of biomes in the Kerbol System.

Biome list


Surface Research Locations

Surface research locations include:

  • Lowlands
  • Highlands
  • Midlands
  • Oblique Impact Site
  • Silicate Fields



File:Gilly region ui.jpg

Gilly biome map with legend (as of v0.2.1.0 (from Orbital Survay mod))

Gilly biome map (Imgur)

Gilly currently has 5 biomes

  • Highlands
  • Lowlands
  • Midlands
  • Oblique Impact Site
  • Silicate Fields

Visual map

File:Gilly visual.png

Gilly visual map (as of v0.2.1.0)

Gilly visual map (Imgur)


Gilly has the lowest gravity of all bodies in the Kerbol system at only 0.5% of Kerbin's surface gravity, which is half that of Jool's moon Pol. It is very impractical to walk on Gilly; each step will launch a Kerbal several meters into the air. A Kerbal can jump over 200 meters on this moon and will usually take more than 4 minutes to return to the surface. This makes jetpacks a necessity to move around the moon practically.

The very low gravity also makes it very difficult to get into an encounter since it makes the sphere of influence so minuscule. An unplanned encounter with Gilly is unlikely when approaching Eve, even if the craft's trajectory is near the plane of Gilly's orbit. Because of this, it is easier to encounter Gilly by approaching it in a rendezvous fashion rather than attempting to intercept it with a single injection maneuver, like one would use to get from LKO to the Mun.

Gilly's mass is very small relative to Eve's mass, resulting in a very small sphere of influence compared to the semi-major axis of its orbit. In fact, no other moon in the game has a smaller mass ratio.

Gilly's gravity makes it ideal for very low fuel interplanetary missions; however, its eccentric and inclined orbit may make encounters more difficult and fuel-costly. Landing, however, is extremely fuel-friendly: it is trivial to land on Gilly and return to orbit spending much less than 100 m/s of delta-v, though fine throttle controls are a necessity during the landing phase to avoid reversing your descent.

The low gravity of this moon makes it an ideal location for mining ore. Even an extremely overloaded lander with a minuscule TWR will be able to return to orbit from the surface. A tanker could use a gravity assist off of Eve to slingshot into an encounter with Kerbin or Duna (made easier by the rapidity with which the transfer windows repeat, due to Eve's fast orbit), and either return the ore to Kerbin's surface for credits, or refuel another ship/refueling station in orbit.


Landing on Gilly is challenging due to its very low mass, steep slopes, and highly eccentric orbit, making it very easy to overthrust engines or send a spacecraft tumbling. Gilly's odd shape and fast rotation give the surface near the peaks an apparent velocity near 5m/s. Some players advise to keep the prograde on the navball tilted a little bit sideways to counter the Coriolis effect if you are landing close to the equator. To prevent tumbling upon landing, the final velocity trim may need to be performed by eye. It is advised to be adept in manually using RCS thrusters and to have SAS active on the lander. If your lander tips over, you can use reaction wheels to put it back upright due to Gilly's very, very low gravity. Time Warp can also be used to stabilize a lander, as vessels tip over so slowly on Gilly the game considers them stable enough to allow time warp.

Gilly was once even more dangerous to land on due to a clipping bug with the collision mesh. This problem was fixed in version 0.17.1.

Escaping Gilly is much easier — the EVA jetpack can easily put a lone Kerbal into orbit or set them on an escape trajectory. In fact, it's possible to deploy a Kerbal from a spacecraft in orbit around Gilly, send them down to the surface, and land them without using any other fuel source. The Kerbal can even return to orbit, rendezvous with the spacecraft, and still have up to 3.5 units of EVA fuel left.

Reference Frames

Time warp Minimum Altitude
5× 8 000 m
10× 8 000 m
50× 8 000 m
100× 20 000 m
1 000× 40 000 m
10 000× 80 000 m
100 000× 100 000 m


  • An unsuccessful touchdown attempt in 0.17. Notice the landing legs clipping through the terrain.

  • Topographical image of Gilly.

  • A successful EVA landing.

  • A topographic height map of Gilly as of Version 0.18.2. Made with the ISA MapSat plugin.

  • A successful probe landing. Small rocks are visible on the surface in the background.

  • A successful scientific, electrically powered probe landed on Gilly. The probe's small mass combined with Gilly's low gravity makes ion engines suitable for landing, as shown here.

  • Kerbals celebrate their first manned voyage to Gilly. (They celebrated even more when they got home.)

  • A space station in orbit of Gilly, where Eve can be seen in the background.(The Eve texture is provided by scatterer, and is not stock/default, but the high-resolution Gilly surface textures are.)


-Though Venus in real life dosn't have any moons, Gilly is very similar in mass and size to Phobos


  • Added biomes
  • Fixed terrain collision detection issues.
  • Initial Release
  • v
  • t
  • e

Kerbol System


(The Sun)

  • Mun
  • Minmus
  • Ike
  • Laythe
  • Vall
  • Tylo
  • Bop
  • Pol
Gilly - Kerbal Space Program Wiki (2024)


How much Delta V to get back from Gilly? ›

Landing, however, is extremely fuel-friendly: it is trivial to land on Gilly and return to orbit spending much less than 100 m/s of delta-v, though fine throttle controls are a necessity during the landing phase to avoid reversing your descent.

How accurate is KSP to real life? ›

While the game is not a perfect simulation of reality, it has been praised for its largely accurate orbital mechanics; all objects in the game except the celestial bodies are simulated using Newtonian dynamics.

How many hours is a Kerbal day? ›

Kerbin calendar

A solar Kerbin day is 6 hours long, the Mun has an orbital period of 38.6 hours which defines a Kerbin month, and Kerbin has an orbital period of 2556.5 hours which defines a Kerbin year.

How much delta-v is needed to get to Eve? ›

It requires about 7000 m/s of vacuum delta-v to get into orbit from sea level. Eve is 1400 km in diameter, making it 200 km larger than Kerbin, and the largest terrestrial planet in the Kerbal solar system.

How hard is it to land on Eve? ›

Eve is a very difficult planet to land on and, moreso, return from. It has an extremely thick atmosphere that makes aerobraking highly dangerous to the unprepared kerbonaut.

What is the hardest planet to return from in KSP? ›

Eve is the real final boss in the game, but thats when your trying to get back to kerbin it has atmosphere and is easy to land on with parachutes, getting back to orbit from eve requires a lot of thought and planning easiest way is a large rocket that can make its own fuel and leave most of it behind, hardest to land ...

What does NASA think of KSP? ›

Kerbal Space Program has spread beyond the gaming community. Just ask NASA, they are fans. Doug Ellison, who works at the Jet Propulsion Laboratory in Pasadena, thinks KSP fills a crucial gap in communicating the science in a playful simulation context.

Does Elon Musk play Kerbal Space Program? ›

The SpaceX and Tesla boss has been showing his appreciation for Kerbal Space Program for years. In a Reddit ask me anything session in 2015, he said the game was “awesome”. KSP has also acknowledged the relationship in the past – and even asked for similar help.

What is the lifespan of a Kerbal in KSP? ›

In the game, the average life expectancy for kerbals is 300 years (aging is four times slower than in real life, even though time progresses the same).

How big is Kerbin compared to Earth? ›

Real-world comparison

Kerbin has approximately one-tenth the radius of Earth and 1/113th the mass.

What is the farthest planet from Kerbal Space Program? ›

Eeloo as seen from orbit. Eeloo is a dwarf planet that was originally released in version 0.18. 2 of KSP1 as a Christmas gift to the KSP community. It is the seventh and farthest planet from Kerbol most of the time, though its orbit intersects Jool's, passing in front of it for a minority of its revolution period.

How much delta-v do you need to get to the Mun and Back? ›

Specifications. Recommended Delta-V: ~ 6,500 for Orbit and Return. ~ 7,500 for Landing and Return.

How much delta-v to get to minimus? ›

Minmus orbits Kerbin at a continuous altitude of 46,400,000 meters and takes approximately 920 m/s Δv to transfer to from low Kerbin orbit.

How much delta-v to get to orbit KSP? ›

Assumption: It takes roughly 2500 m/s of Δv to escape Kerbin's atmosphere before vacuum Δv values take over for the stage powering the transition (actual value ranges between 2000 m/s and 3400 m/s depending on ascent). Note that, as of KSP 1.3. 1, around 3800 m/s of Δv is required to reach an 80km orbit from the KSC.

How much delta-v to get to Duna? ›

With proper aerobraking, a round trip from Kerbin to Duna's orbit and back requires roughly 1700 m/s of delta-v, less than a round trip to any other planet.

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