Kerbol/ja

Kerbol/Data

Kerbol/カーボル (公式では太陽と呼ばれる、また恒星である)はKerbol系の中心にある星である。バージョン 0.23ではMoho、 Eve、 Kerbin、Duna、 Joolの5つの惑星とDres、Eelooの2つの準惑星が周回している。

現実の太陽と比較して、1/113の質量と1/3の半径を持つ。K型主系列星の温度、赤色矮星の半径、Kerbinの温度に基づくと3ヨタワットの光度（0.02太陽光度）、準褐色矮星の質量を持つ。恒星の最低質量は木星の75倍、Kerbolの10倍の力なので、現実にはこのような恒星は存在し得ないが、KSPの殆どの天体物理的性質はあえてスケールダウンされている。

ゲーム内の説明

「

The Sun is the most well known object in the daytime sky. Scientists have noted a particular burning sensation and potential loss of vision if it is stared at for long periods of time. This is especially important to keep in mind considering the effect shiny objects have on the average Kerbal.

— Kerbal Astronomical Society

」

Orbiting Kerbol

While Kerbol can be reached from Kerbin's orbit by using a Hohmann transfer orbit, doing so requires a Δv of about 8 km/s. The most efficient way to reach Kerbol from Kerbin orbit is to use a bi-elliptic transfer. With a sufficiently-distant apoapsis, the required ΔV to "sundive" can be reduced to under 4 km/s at the expense of drastically-increased flight time.

Orbits just above the surface have an orbital period of 409.214 minutes and a speed of 66.945 km/s. At around 1,340m above the surface, there is a sudden increase in temperature which causes destruction to vessel parts and kerbonauts on EVA; this marks the closest sustained altitude possible, though catastrophic dives to lower depths are possible.

The sphere of influence of Kerbol is infinite. An orbit around Kerbol is inescapable, and achieving gravitation-free flight is impossible. Once the apoapsis reaches a certain point, the game will say that it takes 68 years to reach. This oddity occurs because times in Kerbal Space Program are limited to 2³²-1 seconds as a consequence of how numbers are handled.

However, if the thrust of an engine is changed to a high value like 10 MN, and the infinite fuel cheat is activated from the debug menu, it is possible to "escape" Kerbol. While the actual escape never occurs, the info tab will display the craft's situation as "escaping". It will reach a point where the course plotted by the game ends, and the spacecraft begins plotting its own course. Presumably, this will continue indefinitely, as the time required to find out what would happen would take several years.

Physical appearance

The equatorial radius of Kerbol is almost four times that that of Jupiter and 43.6 times larger than Jool's radius, currently the largest known planet. Kerbol's heat will always destroy a craft, even with the "No crash damage" cheat enabled, and makes landing on Kerbol impossible.

Squad has long-term plans for solar flares and prominences that would make a low Kerbol orbit even more dangerous.^[要出典] It is currently possible for a craft to approach to roughly 1300 meters altitude before it explodes due to overheating. No known way of landing on Kerbol exists. One can attempt to place edited parts on the surface, but they bounce erratically at a few hundred to a few thousand m/s if they do not explode.

Until version 0.11 Kerbol was a point of light in the skybox impossible to reach, although no “surface” existed. Up to version 0.13.3 dropping below the “surface” was still safe, but a ship can break up from the extreme gravity gradients and/or be shot outwards at large fractions of the speed of light.

If close enough it is possible to see that the dark spots are indented.

Reference Frames

時間加速中	最低高度
1×	どこでも
5×	3 270 000 m
10×	3 270 000 m
50×	6 540 000 m
100×	13 080 000 m
1 000×	26 160 000 m
10 000×	52 320 000 m
100 000×	65 400 000 m

All Kerbol orbits are in an inertial reference frame. In the old demo, getting close enough to experience the lower maximum time warps results in Deep Space Kraken attacks.

Trivia

The name “Kerbol” was created by forum members and never appears in the game. Officially, the star is simply referred to as “the Sun," though the lead developer mentioned that its name could change once the need to differentiate it from other stars arises.
Kerbol has just under twice the surface gravity of Kerbin, but only slightly more than Eve.

Gallery

A picture taken of a probe on a close encounter with Kerbol shortly before overheating.
Up close the glow becomes evidently ennagonal.
ISA MapSat output for Kerbol Star (this map comes with the plugin and is not based on any measured terrain data)
Elevation shown on Kerbol