Difference between revisions of "KEO"

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'''Kerbisynchronous Equatorial Orbit''' (or '''KEO''' for short) is the [[stationary orbit]] of the planet [[Kerbin]], a very useful orbit for satellites. A spacecraft on this orbit will appear stationary when viewed from the surface. This can be useful when establishing a wireless connection between the craft and a structure on the surface, but it also makes observation of a certain spot on the surface easy. To achieve this orbit, the craft must have a/an:
 
 
{| class="wikitable"
 
|-
 
| [[semi-major axis|Semi-Major Axis]] || {{OrbitAltitude|b=Kerbin|3=0}}
 
|-
 
| Orbital Altitude || {{OrbitAltitude|b=Kerbin}}
 
|-
 
| Orbital Speed || {{OrbitVelocity|b=Kerbin}}
 
|-
 
| Orbital Period || 1 Kerbin Sidereal Day (5h 59m 9.425s)
 
|}
 
 
When fine-tuning the position over KSC, remember that lower orbits move at higher velocities and higher orbits move at lower velocities. This means circularizing the orbit just below the {{OrbitAltitude|b=Kerbin}} mark will cause the craft to move "East" relative to Kerbin's surface, and circularizing just above with will move the craft "West" relative to the surface.
 
 
== Maneuver planning ==
 
The basic maneuver plan for reaching this orbit is to first achieve a [[LKO|low Kerbin orbit]] (LKO) and then perform two maneuvers to execute a [[Hohmann transfer orbit|Hohmann transfer]]. The first one, called the periapsis maneuver, is raising the apoapsis to the required altitude for a synchronous orbit. This places the spacecraft on a '''kerbisynchronous transfer orbit''' (KTO). The second one is at the apoapsis.
 
 
Depending on the required orbit the second burn also includes nearly all of the plane change to reduce the equatorial inclination to zero.  For stationary orbits the periapsis maneuver should be executed when crossing the equatorial plane. Since the [[Kerbal Space Center]] is on the equator, the timing and trigonometry may be skipped.
 
 
The following are instantaneous impulse calculations for equatorial low energy orbits, and therefore the real maneuvers will always be somewhat more than these values.
 
 
{| class="wikitable"
 
! LKO altitude
 
! Periapsis
 
! Apoapsis
 
! Total
 
|-
 
| 70 km
 
| 676.6 m/s
 
| 434.9 m/s
 
| 1111.5 m/s
 
|-
 
| 90 km
 
| 659.6 m/s
 
| 427.8 m/s
 
| 1087.4 m/s
 
|-
 
| 100 km
 
| 651.5 m/s
 
| 424.3 m/s
 
| 1075.8 m/s
 
|-
 
| 120 km
 
| 635.5 m/s
 
| 417.4 m/s
 
| 1052.9 m/s
 
|-
 
| 150 km
 
| 612.7 m/s
 
| 407.3 m/s
 
| 1020.0 m/s
 
|-
 
| 200 km
 
| 577.4 m/s
 
| 391.3 m/s
 
| 968.7 m/s
 
|-
 
| 300 km
 
| 515.3 m/s
 
| 361.3 m/s
 
| 876.6 m/s
 
|}
 
 
For direct launches, transfers from the lowest orbits will be more efficient because they require less delta-v to reach from the surface of Kerbin. Higher LEOs may be preferable if the spacecraft is visiting a tug or space station and requires altitude above the atmosphere to execute a rendezvous. These maneuver plans may also be useful for one who wishes to boost a large space station assembled in LKO to KEO (keep in mind that the craft may not have the thrust to make burns very efficient).
 
 
== Other celestial bodies ==
 
In theory those orbits also exists for other celestial bodies, but may be outside the sphere of influence.
 
 
== See also ==
 
* {{Wikipedia|Geostationary orbit}}
 
* {{Wikipedia|Geosynchronous orbit}}
 
* {{Wikipedia|Stationary orbit}}
 
* {{Wikipedia|Synchronous orbit}}
 

Revision as of 18:10, 17 March 2017