Editing 3753 Cruithne

{{Addon
|1=[https://www.orbiter-forum.com/resources/cruinthe-asteroid-3753.4045/ Cruinthe Asteroid 3753]
|2=[[List of add-ons by Burnrate|Burnrate]]
|3=2009-08-17
|4=Orbiter 2006, Orbiter 2010, Orbiter 2016
}}

{| cellpadding="2" cellspacing="0" style="margin:25px 0 0 10px; border:3px solid lightsteelblue;width:250px; font-size:90%; font-family:'Arial','Helvetica'; float: right; clear: right;"Template in Orbiter"
!bgcolor="lightsteelblue" colspan="2" align="center" |Cruinthe
|-
|colspan="2" align="center"|[[Image:Cruinthe.png|240px]]
|-
|colspan="2" align="center"|'''Cruithne in Orbiter'''
|-
!bgcolor="lightsteelblue" colspan="2"|Designation
|-
|Name||align="right"|Cruinthe
|-
|width="30%"|Reference body||align="right" width="30%"|Sun
|-
|width="30%"|Number of satellites||align="right" width="30%"|0
|-
!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
|-
|width="30%"|Epoch||align="right" width="50%"|
|-
|width="30%"|Semimajor axis (a)||align="right" width="50%"| 1.49257344448×10<sup>8</sup> km<br>(0.997723722661 AU)
|-
|width="30%"|Eccentricity (e)||align="right" width="30%"| 0.5148753565387774
|-
|width="30%"|Inclination (i)||align="right" width="30%"|0.34575447488 radian<br>(19.810272158°)
|-
|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|2.20406746116 radian<br>126.2837632865°
|-
|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|2.96764675609 radian<br>170.033634209°
|-
|width="30%"|Mean longitude (L)||align="right" width="30%"|5.9410765786 radian<br>340.398613717°
|-
!bgcolor="lightsteelblue" colspan="2"|Rotational Elements
|-
|width="30%"|Sidereal Rotation Period||align="right" width="50%"|98784 seconds<br>(1.143333 days)
|-
|width="30%"|Sidereal Rotation Offset||align="right" width="50%"|0
|-
|width="30%"|Obliquity||align="right" width="30%"|0.1 radians<br>5.72958°
|-
!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
|-
|width="30%"|Mean radius||align="right" width="30%"| 1650 km
|-
|width="30%"|Mass||align="right" width="30%"|×10<su>23</sup> kg
|-
|width="30%"|Density||align="right" width="30%"| 4.05g/cm<sup>13</sup>
|-
|width="30%"|Equatorial gravity||align="right" width="30%"| 0.00099 m/s<sup>-10</sup>
|-
|width="30%"|Escape velocity||align="right" width="30%"| 1.81 m/s
|-
|width="30%"|Gravity at surface||aligh="right" width="30%"|Cruinthe 15%<br>Sun 85%
|-
|width="30%"|Note||align="right" width="30%"|*Elements given are from Cruinthe.cfg file.
|}

'''3753 Cruithne''', known in [[Orbiter]] simply as Cruinthe is an asteroid, belonging to the [[w:Aten asteroid]] group, in an elliptical solar orbit with almost a 1:1 resonance with the Earth, and was discovered on 10 October 1986 by [[w:Duncan Waldron]]. It's orbit takes Cruinthe from the orbit of [[Mercury]] to beyond that of [[Mars]]. In Orbiter, Cruinthe was added as an [[Add-on]] by [[List of add-ons by Burnrate|Burnrate]] in 2009.

== Note about the name ==
It is to be noted that the actual body is named 'Cruithne', whereas the name of the body in the add-on for Orbiter is 'Cruinthe'. In this article, when referring to the actual body, 'Cruithne' will be used; when referring to the body on Orbiter, 'Cruinthe' will be used.

== Physical Characteristics in Orbiter ==
Cruinthe has a diameter of about 3300 meters, and a mass of 4.05×10<sup>13</sup> kg. The surface gravity is only about .001 m/s<sup>2</sup> and escape velocity is about 1.8 m/s, so, one may be able to jump beyond escape velocity. When landing a spacecraft, it may touch down slightly above or below the surface.

== Orbital Characteristics in Orbiter ==
Cruinthe revolves around the [[Sun]] at a semi-major axis of just under 1 AU, almost the same distance as the Earth, with an eccentricity of a bit over 0.5, resulting in an orbit that ranges from just outside that of Mercury out past that of Mars. 

Orbiting the Sun in slightly under a year, the actual Cruithne is in lockstep with Earth, approaching within about 12 million km, then drifting to the opposite side of the Sun from the Earth, to about the same distance on the other side of the Earth. It's unknown whether this phenomena is modeled in Orbiter.

== Rotational characteristics ==

Cruinthe rotates upon its axis in 98784 seconds, or 27<sup>h</sup> 26<sup>m</sup> 34<sup>s</sup>.

== Notice to pilots ==
Due to its size and mass, and the distance from the Sun, at the surface of Cruinthe, the Sun's gravity is stronger than that of Cruinthe, OrbitMFD shows Cruinthe gravity at 0.15 and the Sun's at 0.85, so you may touchdown and stay on the surface, albeit barely, but as often you will begin to drift off the surface. Perhaps the best landing is on the night side as Cruinthe and the Sun are pulling in the same direction.

The landing light of the DeltaGlider doesn't seem to work on Cruithne.

== See also ==
*[[w:3753 Cruithne|3753 Cruithne]] at Wikipedia.

==Gallery==
<gallery widths="200" heights="200">
Orbits of Cruithne and Earth.gif|<center>Cruithne and Earth seem to follow each other because of a 1:1 orbital resonance. From Wikimedia commons.</center>
</gallery>

[[Category:Articles]]
[[Category:Celestial bodies]]
[[Category:Solar System]]
[[Category:Near-Earth objects]]