Difference between revisions of "Kerbin/sv"
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− | '''Kerbin''' | + | '''Kerbin''' är en Kerbal Space Programs analog av människornas planet jorden. Planeten Kerbin är hemplaneten till de gröna varelserna [[Kerbal]]s. Det är även denna planet som står i centrum i spelet - [[Kerbal Space Center|Space Center]] ligger nämligen där. Kerbin har två [[månar]]: den ena med namnet '''[[Mün]]''', som också är den största och närmaste liggande till Kerbin. Den andre månen heter '''[[Minmus]]''', den är minst och ligger längst bort från Kerbin. |
− | Kerbin | + | Kerbin är den tredje planeten i omloppsbana räknat runt stjärnan [[Kerbol/sv|Kerbol]]. Kerbin är den tredje största planeten (efter [[Jool/sv|Jool]] och [[Eve/sv|Eve]]). Den är också den fjärde största himlakroppen runt Kerbol. |
− | + | Att lyckas komma upp i omloppsbana runt Kerbin är något av de första milstolparna en spelare brukar uppnå. Att lyckas skapa en sådan omloppsbana med optimalt bränsleanvändande uppskjutning<ref>A fuel-optimal ascent is one which (a) minimizes velocity losses to gravity and [[atmosphere|atmospheric drag]] and (b) launches eastward (toward the 90 degree heading) to gain 174.5 m/s of orbital velocity for free, thanks to Kerbin's rotation.</ref> kräver en delta-V på ≈4500 m/s, <ref>See [http://forum.kerbalspaceprogram.com/showthread.php/24017-Least-delta-v-to-orbit this challenge on the forum] and a popular [http://i.imgur.com/CEZS1.png Kerbin delta-V chart]</ref> vilket är den andra största delta-V-förändringen i spelet efter [[Eve/sv|Eve]]. För många interplanetariska uppdrag uppgör denna delta-V-kostnad hälften av uppdragets totala delta-V-kapacitet. Detta stämmer även med riktiga rymdresor på jorden, vilket har gett os citatet: | |
− | {{Quote|If you can get your ship into orbit, you're halfway to anywhere.|Robert Heinlein|quoted on page 194 of ''A Step Farther Out'' by Jerry Pournelle}} | + | {{Quote|If you can get your ship into orbit, you're halfway to anywhere.|Robert Heinlein|quoted on page 194 of ''A Step Farther Out'' by Jerry Pournelle}} vilket kan direktöversättas till "Om du kan få upp ditt skepp i omloppsbana är du halvvägs till en resa var du vill". |
− | == | + | |
+ | == Topografi == | ||
[[File:Kerbin heightmap.jpg|thumb|left|Topographical representation of Kerbin's surface as of .18.2. Click for high resolution. by Zeroignite]] | [[File:Kerbin heightmap.jpg|thumb|left|Topographical representation of Kerbin's surface as of .18.2. Click for high resolution. by Zeroignite]] | ||
Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 4 km in height, with the tallest peak being just under 4044 m in altitude. | Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 4 km in height, with the tallest peak being just under 4044 m in altitude. |
Revision as of 15:40, 14 June 2015
Kerbin | ||
Kerbin as seen from orbit. | ||
Planet of Kerbol | ||
Orbital Characteristics | ||
Semi-major axis | 13 599 840 256 m [Note 1] | |
Apoapsis | 13 599 840 256 m [Note 1] | |
Periapsis | 13 599 840 256 m [Note 1] | |
Orbital eccentricity | 0 | |
Orbital inclination | 0 ° | |
Argument of periapsis | 0 ° | |
Longitude of the ascending node | 0 ° | |
Mean anomaly | 3.14 rad (at 0s UT) | |
Sidereal orbital period | 9 203 545 s | |
426 d 0 h 32 m 24.6 s | ||
Synodic orbital period | Not defined | |
Orbital velocity | 9 285 m/s | |
Physical Characteristics | ||
Equatorial radius | 600 000 m | |
Equatorial circumference | 3 769 911 m | |
Surface area | 4,5238934×1012 m2 | |
Mass | 5,2915158×1022 kg | |
Standard gravitational parameter | 3,5316000×1012 m3/s2 | |
Density | 58 484,090 kg/m3 | |
Surface gravity | 9,81 m/s2 (1 g) | |
Escape velocity | 3 431,03 m/s | |
Sidereal rotation period | 21 549,425 s | |
5 h 59 m 9.4 s | ||
Solar day | 21 600,000 s | |
5 h 59 m 60 s | ||
Sidereal rotational velocity | 174,94 m/s | |
Synchronous orbit | 2 863,33 km | |
Sphere of influence | 84 159 286 m [Note 1] | |
Atmospheric Characteristics | ||
Atmosphere present | Yes | |
Atmospheric pressure | 101,325 kPa | |
1 atm | ||
Atmospheric height | 70 000 m | |
1,0×10-6 atm | ||
Temperaturemin | -86.20 °C 186.95 K | |
Temperaturemax | 15 °C 288.15 K | |
Oxygen present | Yes | |
Scientific multiplier | ||
Surface | 0.3 | |
Splashed | 0.4 | |
Lower atmosphere | 0.7 | |
Upper atmosphere | 0.9 | |
Near space | 1 | |
Outer space | 1.5 | |
Recovery | 1 | |
|
Kerbin är en Kerbal Space Programs analog av människornas planet jorden. Planeten Kerbin är hemplaneten till de gröna varelserna Kerbals. Det är även denna planet som står i centrum i spelet - Space Center ligger nämligen där. Kerbin har två månar: den ena med namnet Mün, som också är den största och närmaste liggande till Kerbin. Den andre månen heter Minmus, den är minst och ligger längst bort från Kerbin.
Kerbin är den tredje planeten i omloppsbana räknat runt stjärnan Kerbol. Kerbin är den tredje största planeten (efter Jool och Eve). Den är också den fjärde största himlakroppen runt Kerbol.
Att lyckas komma upp i omloppsbana runt Kerbin är något av de första milstolparna en spelare brukar uppnå. Att lyckas skapa en sådan omloppsbana med optimalt bränsleanvändande uppskjutning[1] kräver en delta-V på ≈4500 m/s, [2] vilket är den andra största delta-V-förändringen i spelet efter Eve. För många interplanetariska uppdrag uppgör denna delta-V-kostnad hälften av uppdragets totala delta-V-kapacitet. Detta stämmer även med riktiga rymdresor på jorden, vilket har gett os citatet:
” | If you can get your ship into orbit, you're halfway to anywhere. — Robert Heinlein, quoted on page 194 of A Step Farther Out by Jerry Pournelle |
” |
Contents
Topografi
Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 4 km in height, with the tallest peak being just under 4044 m in altitude.
Kerbin shows signs of having been impacted by an asteroid or comet. That is visible in the large crater in the western hemisphere. The crater's central peak is visible from orbit and was caused by the compression followed by the rebound of material in the center of the crater.
Atmosphere
Kerbin's atmosphere contains oxygen and extends to roughly 69,078 meters. Its atmosphere becomes exponentially less dense as altitude increases (with a scale height of 5 km).[3] In general, the atmospheric pressure on Kerbin, at an altitude expressed in meters, is:
The following table gives approximation of terminal velocities at different Kerbin altitudes. These are also the velocities at which a ship should travel for a fuel-optimal ascent from Kerbin, given the game's model of atmospheric drag (0.18.1).[4]
Altitude (m) | Velocity (m/s) |
---|---|
0 | 97.3 |
1000 | 110 |
3000 | 130 |
5000 | 160 |
8000 | 215 |
10000 | 260 |
15000 | 425 |
32000 | 2250 |
Orbits
Geosynchronous orbit is achieved at an altitude of 2 863,33 km (1008.9 m/s). From a 70 km low equatorial orbit, the periapsis maneuver requires 676.5 m/s and the apoapsis maneuver requires 434.9 m/s. A semi-synchronous orbit with an orbital period of 1/2 of Kerbin's rotation period (3 hours or 10800 seconds) is achieved at an altitude of 1 581,76 km with an orbital velocity of 1 272,28 m/s.
Interplanetary Travel
From the lowest stable orbit around Kerbin (70 km), the amount of delta-V needed to reach the orbits of other celestials is as follows:
Body | Delta-V | |
---|---|---|
Mün | ~860 m/s | |
Minmus | ~930 m/s | |
Eve | ~1033 m/s | |
Duna | ~1060 m/s | |
Moho | ~1676 m/s | |
Jool | ~1915 m/s | |
Eeloo | ~2100 m/s | |
KEO (comparison) | ~1120 m/s |
Reference Frames
Time warp | Minimum Altitude |
---|---|
1× | Any |
5× | 70 000 m (above the atmosphere) |
10× | 70 000 m (above the atmosphere) |
50× | 70 000 m (above the atmosphere) |
100× | 120 000 m |
1 000× | 240 000 m |
10 000× | 480 000 m |
100 000× | 600 000 m |
Gallery
A projection map of Kerbin, as of 0.14.1 and before (including the demo).
Topographical image of Kerbin from 0.17.1. The terrain is slightly different in the latest version.[5]
Changes
- Terrain overhaul: Entire planet redo. Deserts, darker and greener grass, islands, darker ocean/water, snow capped mountains. Looks more realistic.
- Several Easter Eggs added.
- Airport added to island off of KSC coastline. (Not a launching point)
- Improved atmosphere visuals.
- Minmus added.
- Much more varied and taller terrain added. Prior to this, some mountain ranges exceeded 600 m in height, but the tallest point was at an altitude of approximately 900 m.
- Mün added.
- Terrain overhaul, oceans became wet.
- Atmosphere extended from ~34,500 m to ~69,000 m.
- Initial Release
Notes
- ↑ A fuel-optimal ascent is one which (a) minimizes velocity losses to gravity and atmospheric drag and (b) launches eastward (toward the 90 degree heading) to gain 174.5 m/s of orbital velocity for free, thanks to Kerbin's rotation.
- ↑ See this challenge on the forum and a popular Kerbin delta-V chart
- ↑ Forum thread 16000, "[KGSS] Examining Kerbin's atmosphere"
- ↑ http://forum.kerbalspaceprogram.com/showthread.php/6664-Mini-challenge-max-altitude-with-this-supplied-spacecraft?p=100912&viewfull=1#post100912
- ↑ http://forum.kerbalspaceprogram.com/entry.php/247-A-Brave-New-World