Difference between revisions of "Gilly"
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Gilly has the least 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. | Gilly has the least 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 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. 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. | + | The 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 an a single injection maneuver as one would use to get from LKO to Mun. |
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| + | 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 well less than 100 m/s of delta-v, though fine throttle controls are a necessity during the landing phase to avoid reversing your descent. | 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 well less than 100 m/s of delta-v, though fine throttle controls are a necessity during the landing phase to avoid reversing your descent. | ||
Revision as of 19:16, 4 January 2018
| Gilly | ||
 | ||
| Gilly as seen from orbit. | ||
| Moon of Eve | ||
| Orbital Characteristics | ||
| Semi-major axis | 31 500 000 m [Note 1] | |
| Apoapsis | 48 825 000 m [Note 1] | |
| Periapsis | 14 175 000 m [Note 1] | |
| Orbital eccentricity | 0.55 | |
| Orbital inclination | 12 ° | |
| Argument of periapsis | 10 ° | |
| Longitude of the ascending node | 80 ° | |
| Mean anomaly | 0.9 rad (at 0s UT) | |
| Sidereal orbital period | 388 587 s | |
| 17 d 5 h 56 m 27.4 s | ||
| Synodic orbital period | 417 243.4 s | |
| Orbital velocity | 274 - 945 m/s | |
| Longest time eclipsed | 5 102 s | |
| Physical Characteristics | ||
| Equatorial radius | 13 000 m | |
| Equatorial circumference | 81 681 m | |
| Surface area | 2.1237166×109 m2 | |
| Mass | 1.2420363×1017 kg | |
| Standard gravitational parameter | 8 289 449.8 m3/s2 | |
| Density | 13 496.328 kg/m3 | |
| Surface gravity | 0.049 m/s2 (0.005 g) | |
| Escape velocity | 35.71 m/s | |
| Sidereal rotation period | 28 255.000 s | |
| 1 d 1 h 50 m 55 s | ||
| Sidereal rotational velocity | 2.8909 m/s | |
| Synchronous orbit | 42.14 km | |
| Sphere of influence | 126 123.27 m [Note 1] | |
| Atmospheric Characteristics | ||
| Atmosphere present | No | |
| Scientific multiplier | ||
| Surface | 9 | |
| Splashed | N/A | |
| Near space | 8 | |
| Outer space | 6 | |
| Recovery | 6 | |
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Gilly is a tiny asteroid, the only natural satellite of Eve, and the smallest celestial body in the Kerbol system.
Contents
In-game Description
| “ | 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.
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” |
Topography
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 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 show up on the surface.
Biomes
With only 3 biomes, Gilly has the fewest number of biomes in the Kerbol System.
Biome list
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Gravity
Gilly has the least 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 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 an a single injection maneuver as one would use to get from LKO to 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 well less than 100 m/s of delta-v, though fine throttle controls are a necessity during the landing phase to avoid reversing your descent.
Landing
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 5 m/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. 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 him on an escape trajectory. In fact, it's possible to deploy a Kerbal from a spacecraft in orbit around Gilly, send him down to the surface, and land him 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
Gallery
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 ionic engines feasible, as shown here.
Changes
- Added biomes
- Fixed terrain collision detection issues.
- Initial Release
