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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"
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==Versions==
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!bgcolor="lightsteelblue" colspan="2" align="center" |Halley
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Not long after Martin made Orbiter open source, he uploaded all the versions he still had to the [https://www.orbiter-forum.com/resources/ Resources] section of [https://www.orbiter-forum.com/ Orbiter-forum].  
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|colspan="2" align="center"|[[Image:HalleyScrnshot.jpg|240px]]
 
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|colspan="2" align="center"|'''Halley in Orbiter 2016 with D3D9 client'''
 
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!bgcolor="lightsteelblue" colspan="2"|Designation
 
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|Name||align="right"|Halley
 
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|width="30%"|Reference body||align="right" width="30%"|[[Sun]]
 
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!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
 
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|width="30%"|Epoch||align="right" width="50%"|2006
 
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|width="30%"|Semimajor axis (a)||align="right" width="50%"|2669601650361.16 m
 
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|width="30%"|Eccentricity (e)||align="right" width="30%"|0.967449497943645
 
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|width="30%"|Inclination (i)||align="right" width="30%"|162.2922643° <br> (2.83253436266766 radian)
 
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|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|58.2997774° <br> (1.01752306877974 radian)
 
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|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|169.4792496° <br> (2.95797092009003 radian)
 
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|width="30%"|Mean longitude (L)||align="right" width="30%"|264.6340534° <br> (4.61873554527679 radian)
 
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!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
 
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|width="30%"|Mean radius||align="right" width="30%"|5500 km
 
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|width="30%"|Mass||align="right" width="30%"|1×10<sup>14</sup> kg
 
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!bgcolor="lightsteelblue" colspan="2"|Rotation elements
 
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|width="30%"|SidRotPeriod||align="right" width="30%"|187200 seconds (52 hours)
 
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|width="30%"|SidRotOffset||align="right" width="30%"|0
 
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|width="30%"|Obliqutiy||align="right" width="30%"|0
 
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|width="30%"|LAN||align="right" width="30%"|0
 
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|width="30%"|Note||align="right" width="30%"|*Elements given are from Halley.cfg (Halley.zip)
 
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'''Halley's Comet''', also referred to as 1P/Halley, is a short period comet appearing in the skies every 72 to 80 years, last seen in 1986 and the next will be in 2061. Named after [[w:Edmond Halley|Edmond Halley]] who was the first to recognize it as a recurring comet although it has been seen since ancient times.
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===Orbiter 2001===
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From Martin:<br>
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== Halley in Orbiter ==
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"The earliest copy of Orbiter I have on record, from 2001."
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Halley was introduced to [[Orbiter]] as an add-on in 2004. Since Orbiter was not designed to show a comet's tails, the add-on depicts it as a rugby ball shaped body much like an asteroid.  
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{{Addon|
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Halley orbits the [[Sun]] in a very elliptical orbit, moving retrograde to the Sun, unlike the planets which move prograde, or counter-clockwise looking from the north of the [[Solar System]]. [[periapsis|Periapsis]] takes Halley to between the orbits of [[Mercury]] and [[Venus]], and at [[apoapsis]] it is beyond that of [[Neptune]].
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|1=[https://www.orbiter-forum.com/resources/orbiter-2001.5437/ Orbiter 2001]|
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|2=Martin Schweiger (martins)
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Note that when landed on Halley near the apoapsis, Halley provides only about 1% of the total gravity, the other 99% by the Sun, but, near apoapsis, Halley provides 98% of the gravity, the Sun, only about 2%. It may be difficult to stay landed near Halley's periapsis. The sphere of influence near apoapsis is about 37 km from the center, and near periapsis, the SOI is right about the surface.
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|3=2001 (orbiter010503)
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}}
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It can be difficult to visit Halley as when it is near apoapsis, Halley is traveling at about 900 m/s, but it's 35 AU from the Sun. Near Periapsis, it's about 0.5 AU from the Sun, but it's traveling almost 55000 m/s.
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===Orbiter 2002===
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From Martin:<br>
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It should also be noted that when landing on Halley that the visual surfaces are well below the hard radius (5500 meters), which is not visible, so instrument landing with HUD in surface is recommended.
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"Orbiter's 2002 release. Both files are needed for a working copy."
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{{Addon|
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{| class="wikitable" style="text-align: center"
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|1=[https://www.orbiter-forum.com/resources/orbiter-2002.5436/ Orbiter 2002]|
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|2=Martin Schweiger (martins)
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|colspan="8"|<center>'''Add-ons which include Halley'''</center>
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|3=2002 (orbiter020419)
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}}
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!Add-on!!Source!!Version!!Author!!Type!!Release Date!!Compatibility!!Wiki article
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===Orbiter 2002-P1, with subsequent patches
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{{Addon|
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|[https://www.orbiter-forum.com/resources/halleys-comet-nucleus.1491/ Halley's Comet Nucleus]||O-F Resources||2004-11-22||Nighthawke||Scenery||22 November 2004||||
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|1=[https://www.orbiter-forum.com/resources/orbiter-2001.5437/ Orbiter 2002P1, 5 files]|
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|}
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|2=Martin Schweiger (martins)
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|3=2002P1 (orbiter021202, orbiter021206, orbiter021217)
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== See also ==
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}}
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[[w:Halley's Comet|Halley's Comet]] at [[w:Wikipedia|Wikipedia]]
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{{Addon|
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|1=[https://www.orbiter-forum.com/resources/orbiter-2001.5437/ Orbiter 2002P1, 5 files]|
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== Gallery ==
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|2=Martin Schweiger (martins)
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<gallery widths="200" heights="200">
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|3=2002P1 (orbiter021202, orbiter021206, orbiter021217)
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Halley-Halleyzip-Orbiter2003P2.jpg|<center>Comet Halley from ''Halley.zip'' in Orbiter 2003P2</center>
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}}
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Lspn comet halley.jpg|<center>Comet 1P/Halley as it appeared from Earth on 8 March 1986</center>
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{{Addon|
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Comet Halley close up-cropped.jpg|<center>The nucleus of Halley as seen by the [[w:Giotto (spacecraft)|Giotto]] spacecraft in 1986</center>
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|1=[https://www.orbiter-forum.com/resources/orbiter-2001.5437/ Orbiter 2002P1, 5 files]|
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Halley's Comet animation.gif|<center>Animation of Halley's orbit<br>The outermost planet is Neptune</center>
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|2=Martin Schweiger (martins)
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Animation of 1P／Halley orbit - 1986 apparition.gif|<center>Orbiter path of Halley during the 1986 apparition as compared to Earth</center>
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|3=2002P1 (orbiter021202, orbiter021206, orbiter021217)
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</gallery>
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}}
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{{SolarSystem}}
 
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[[Category:Articles]]
 
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[[Category:Celestial bodies]]
 
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[[Category:Solar System]]
 
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[[Category:Comets]]
 

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