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{{Addon
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|1=[https://www.orbiter-forum.com/resources/cruinthe-asteroid-3753.4045/ Cruinthe Asteroid 3753]
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|2=[[List of add-ons by Burnrate|Burnrate]]
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|3=2009-08-17
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|4=Orbiter 2006, Orbiter 2010, Orbiter 2016
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}}
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{| 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"
 
{| 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"
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!bgcolor="lightsteelblue" colspan="2" align="center" |3753 Cruithne
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!bgcolor="lightsteelblue" colspan="2" align="center" |Cruinthe
 
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|colspan="2" align="center"|[[Image:3753Cruithne-Cruinthezip-Orbiter2006P1.jpg|240px]]
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|colspan="2" align="center"|[[Image:Cruinthe.png|240px]]
 
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|colspan="2" align="center"|'''3753Cruithne from ''Cruinthe.zip'' in Orbiter2006P1'''
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|colspan="2" align="center"|'''Cruinthe in Orbiter'''
 
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!bgcolor="lightsteelblue" colspan="2"|Designation
 
!bgcolor="lightsteelblue" colspan="2"|Designation
 
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|Name||align="right"|3753 Cruithne
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|Name||align="right"|Cruinthe
 
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|width="30%"|Reference body||align="right" width="30%"|Sun
 
|width="30%"|Reference body||align="right" width="30%"|Sun
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!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
 
!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
 
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|width="30%"|Epoch||align="right" width="50%"|
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|width="30%"|Epoch||align="right" width="50%"|J2000 (1 January 2000)
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|-
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|width="30%"|Semimajor axis (a)||align="right" width="50%"|0.38709893 AU <br> 5.790917567×10<sup>7</sup> km)
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|-
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|width="30%"|Eccentricity (e)||align="right" width="30%"|0.20563069
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|-
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|width="30%"|Inclination (i)||align="right" width="30%"|7.00487° <br> (0.122258 radian)
 
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|width="30%"|Semimajor axis (a)||align="right" width="50%"| 1.49257344448×10<sup>8</sup> km<br>(0.997723722661 AU)
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|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|48.33167° <br> (0.8436468 radian)
 
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|width="30%"|Eccentricity (e)||align="right" width="30%"| 0.5148753565387774
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|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|77.45645° <br> (1.351870 radian)
 
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|width="30%"|Inclination (i)||align="right" width="30%"|0.34575447488 radian<br>(19.810272158°)
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|width="30%"|Mean longitude (L)||align="right" width="30%"|252.25084° <br> (4.402608 radian)
 
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|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|2.20406746116 radian<br>126.2837632865°
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!bgcolor="lightsteelblue" colspan="2"|Planetary orbital element centennial rates
 
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|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|2.96764675609 radian<br>170.033634209°
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|width="30%"|Semimajor axis (a)||align="right" width="50%"|0.00000066 AU/Century
 
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|width="30%"|Mean longitude (L)||align="right" width="30%"|5.9410765786 radian<br>340.398613717°
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|width="30%"|Eccentricity (e)||align="right" width="50%"|0.00002527 Century<sup>-1</sup>
 
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!bgcolor="lightsteelblue" colspan="2"|Rotational Elements
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|width="30%"|Inclination (i)||align="right" width="30%"|-23.51 seconds/Century
 
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|width="30%"|Sidereal Rotation Period||align="right" width="50%"|98784 seconds<br>(1.143333 days)
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|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|-446.30 seconds/Century
 
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|width="30%"|Sidereal Rotation Offset||align="right" width="50%"|0
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|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|573.57 seconds/Century
 
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|width="30%"|Obliquity||align="right" width="30%"|0.1 radians<br>5.72958°
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|width="30%"|Mean longitude (L)||align="right" width="30%"|538101628.29 seconds/Century
 
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!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
 
!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
 
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|width="30%"|Mean radius||align="right" width="30%"| 1650 km
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|width="30%"|Mean radius||align="right" width="30%"|2440 km
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|width="30%"|Mass||align="right" width="30%"|3.301880×10<sup>23</sup> kg
 
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|width="30%"|Mass||align="right" width="30%"|×10<su>23</sup> kg
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|width="30%"|Density||align="right" width="30%"|5.427 g/cm<sup>3</sup>
 
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|width="30%"|Density||align="right" width="30%"| 4.05g/cm<sup>13</sup>
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|width="30%"|Sidereal rotation period||align="right" width="30%"|1407.509 hours
 
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|width="30%"|Equatorial gravity||align="right" width="30%"| 0.00099 m/s<sup>-10</sup>
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|width="30%"|Sidereal orbit period||align="right" width="30%"|0.2408445 years
 
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|width="30%"|Escape velocity||align="right" width="30%"| 1.81 m/s
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|width="30%"|Magnitude V(1,0)||align="right" width="30%"|-0.42
 
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|width="30%"|Gravity at surface||aligh="right" width="30%"|Cruithne 15%<br>Sun 85%
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|width="30%"|Geometric albedo||align="right" width="30%"|0.106
 
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|width="30%"|Note||align="right" width="30%"|*Elements given are from Cruinthe.cfg file.
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|width="30%"|Equatorial gravity||align="right" width="30%"|3.701 m/s<sup>2</sup>
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|-
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|width="30%"|Escape velocity||align="right" width="30%"|4.435 km/s
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|-
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!bgcolor="lightsteelblue" colspan="2"|Rotation elements
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|-
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|width="30%"|North pole right ascension (α<sub>1</sup>)||align="right" width="30%"|280.99°
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|-
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|width="30%"|North pole declination (δ<sub>1</sup>)||align="right" width="30%"|61.44°
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|-
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|width="30%"|Obliqutiy of ecliptic||align="right" width="30%"|7.01°
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|-
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|width="30%"|Longitude of Sun's transit||align="right" width="30%"|228.31°
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|-
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|width="30%"|Note||align="right" width="30%"|*Elements given are from Orbiter.pdf (2016)
 
|}
 
|}
  
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{{Addon|
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'''3753 Cruinthe''', known in [[Orbiter]] simply as Cruinthe is an asteroid in an elliptical solar orbit with almost a 1:1 resonance with the Earth. 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.
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|1=[https://www.orbiter-forum.com/resources/cruinthe-asteroid-3753.4045/ Cruinthe Asteroid 3753]|
 
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|2=Burnrate
 
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|3=2009-08-17
 
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|4=
 
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}}
 
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'''3753 Cruithne''' 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 Cruithne from the orbit of [[Mercury]] to beyond that of [[Mars]]. In Orbiter, Cruithne was added as an [[Add-on]] by [[List of add-ons by Burnrate|Burnrate]] in 2009.
 
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Cruithne orbits in a 'bean-shaped' orbit when viewed from Earth's perspective. Currently, it's orbit is just slightly less than that of Earth. It orbits the [[Sun]] in about one day less than a year. It is currently orbiting ahead of [[Earth]], and over time, it will gain a greater lead until eventually it will be opposite Earth, then will slowly catch up to Earth. As it approaches, perturbations by Earth will increase its period slightly, then it will fall behind until it reaches opposite, then approaches Earth from ahead of it, then perturbations will then decrease its period until its faster than Earth. This cycle takes about 770 years to complete. It never approaches closer to Earth than 12 million km. It's inclination is 19.8°, and its orbit never crosses that of Earth except when perturbed into its new orbit, so there is no danger of collision.
 
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== Note about the name ==
 
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The add-on file is ''Cruinthe.zip'', spelled incorrectly. this should be corrected thusly:
 
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*Rename the file ''Cruinthe.cfg'' as ''3753 Cruithne.cfg''
 
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*Open the file ''Cruithne.cfg'', change the Name =  to ''3753 Cruithne'' and in the first line, change the spelling.
 
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*Rename the file ''Read Me (Cruinthe).txt'' in the Doc directory to ''Read Me (3753 Cruithne).txt''
 
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*Open that file and change both references in there.
 
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*Rename the files ''Cruinthe.tex'' and ''CruintheM.bmp'' as ''3753 Cruithne.tex'' and ''3753 Cruithne''
 
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== Physical Characteristics in Orbiter ==
 
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3753 Cruithne 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, and it may be difficult to keep your vessel in a landed state.
 
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== Orbital Characteristics in Orbiter ==
 
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3753 Cruithne 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.
 
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Orbiting the Sun in slightly under a year, the actual 3753 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.
 
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It is unknown whether Orbiter can duplicate the resonance cycle.
 
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== Rotational characteristics ==
 
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3753 Cruithne rotates upon its axis in 98784 seconds, or 27<sup>h</sup> 26<sup>m</sup> 34<sup>s</sup>.
 
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== Local gravity near Cruithne ==
 
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When landed Cruithne provides only about 15% of the total gravity field, the Sun providing the other 85%. Acceleration due to gravity is about 0.008 m/s<sup>2</sup>, Cruithne's gravity has a reach of about 9280 km from the body.
 
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== Notice to pilots ==
 
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Due to its size and mass, and the distance from the Sun, at the surface of Cruithne, the Sun's gravity is stronger than that of Cruithne, OrbitMFD shows Cruithne 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 Cruithne and the Sun are pulling in the same direction.
 
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The local lighting is interesting on Cruithne, the docking and landing light on the DeltaGlider will light up another ship parked nearby, but the terrain does not reflect local lights. Cruithne is opaque to the star field, the Sun and other bodies, but, if another ship is parked over the horizon, it is visible to your ship right through the terrain.
 
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== See also ==
 
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*[[w:3753 Cruithne|3753 Cruithne]] at Wikipedia.
 
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==Gallery==
 
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<gallery widths="100" heights="100">
 
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3753Cruithne-Cruinthezip-Orbiter2006P1.jpg|<center>3753 Cruithne from ''Cruinthe.zip'' in Orbiter 2006P1</center>
 
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Cruinthe.png|<center>3753 Cruithne in Orbiter 2016</center>
 
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Cruithne.jpg|<center>3753 Cruithne as imaged by the [[w:Powell Observatory|Powell Observatory]] in July 2001</center>
 
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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>
 
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Horseshoe orbit of Cruithne from the perspective of Earth.gif|<center>What Cruithne's orbit looks like from the perspective of Earth<br>from Wikimedia Commons</center>
 
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3753CruithneOrbit.jpg|<center>Orbit of 3753 Cruithne on 28 November 2024<br>from JPL Horizons orbit viewer</center>
 
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</gallery>
 
  
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[[Category:Articles|Cruithne]]
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== Orbital Characteristics ==
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[[Category:Celestial bodies|Cruithne]]
 
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[[Category:Solar System|Cruithne]]
 
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[[Category:Near-Earth objects|Cruithne]]
 

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