Ike/zh-cn

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Ike/Data

Ike 是一颗 卫星,也是 Duna 唯一的一颗 天然卫星 。Ike 的表面布满了陡峭的岩石斜坡,它没有大气层。因为 Ike 和 Duna 距离较近,同时又由于 Ike 自身的体积,这两个天体保持着潮汐锁定状态。也就是说,Ike 绕 Duna 进行同步自转,大约只有一半稍多的 Duna 地区能看到 Ike,反之亦然。(如果不是因为 Ike 轨道的偏心率,应该是正好一半的区域,而由于轨道偏心率的存在,有一些地区能观测到 Ike 的升起和落下。参见下文的“天平动”。)

接近 Duna 的飞行过程中很容易可以进入 Ike 的轨道,只要飞行器轨道保持在 Ike 轨道平面就可以。这是因为 Ike 的引力作用球体对比其轨道半长轴要相对偏大。实际上,这个比值,即引力作用范围与轨道半长轴的比值,在 Kerbal 星系中的所有卫星排名第一。

Ike 同步轨道不可能存在,理论轨道高度为 0.00 米,已处于 Ike 的引力作用范围之外。然而,因为 Ike 和 Duna 的潮汐锁定状态,位于 Duna 同步轨道上的飞行器也会基本保持与 Ika 的相对静止状态,和处于 Ike 同步轨道差不多。不过由于 Ike 轨道还是有少量的离心率和倾角,两者无法精确的同步。

同步运行与天平动

由于 Ike 的运转轨道,在 Duna 上会看到这颗卫星一直停留在某个经度附近。Ike 通常会停留在垂直正上方(即 天顶)的偏东 3 度,更精确点来说是在 0 度和偏东 6 度之间振荡,这是由于 Ike 自身的轨道离心率。这也影响了在 Duna 表面的观测者,他会看到 Ike 的大小有一定的变化。另外由于 Ike 轨道的倾角,它还会在天顶偏北 0.2 度和偏南 0.2 度间来回移动,在地面看起来 Ike 似乎是在上下转动,不过由于这个倾角很小,这个效果几乎察觉不到。所有这些现象就是所谓的天平动。由于 Ike 在地平线上方位置的振荡变化,在 Duna 的 90°W ~ 84°W,以及 90°E ~ 96°E 之间的区域,可以观测到至少有一部分 Ike 从地平线升起、落下,在 89.8°N 北侧或 89.8°S 南侧也可以观察到这一现象。

从 50 km 高度的 Duna 轨道转移到 10 km 高度的Ike 轨道需要大约 435 m/s 的 delta-V。

Topography

Ike is extremely rocky. Its tallest points are 12.75 km above its lowest, giving it an elevation range over 3 times that of the Mun despite the fact that the Mun has a 54% wider radius and 137% more surface area. The increased elevation and smaller size result in many steep slopes and make landing quite difficult. The bottoms of valeys are among the flatter, safer landing locations.

Ike lacks any visible impact craters. This is strange considering that it has no atmosphere and isn't much smaller than Duna which has plenty of craters.

The ground is dark grey, notably darker than that of other rock moons like Mun, and sprinkled with large rocks when terrain scatters are on.

Tracking Station Info

Ike is a relatively large, grey object occasionally seen orbiting Duna. Scientists have postulated that Ike is seemingly perfectly positioned to sneakily interfere with any object that presumes to come orbiting near its parent.

Easter eggs

Spoiler:
There is a boulder locked in a polar orbit, roughly 100 cubic meters, with green bands and a monolith. It has no gravitational pull (and is not affected by gravity). It has a flawed collision box, so an attempted landing always results in an explosion of some kind. It's called 'The Magic Boulder' which is it's official name (if you collide with it, you will see a message "Ship crashed into magic boulder"). An example video has been made by youtuber Scott Manley, who maintaned a distance of 8 meters long enough to give viewers an excellent picture of the object. (http://www.youtube.com/watch?v=WJBSea-3DHs)

Reference Frames

时间加速 最低海拔
所有
5× 5 000
10× 5 000
50× 10 000
100× 25 000
1 000× 50 000
10 000× 100 000
100 000× 200 000

Gallery

Changes

0.17
  • Initial Release