Editing Hydra

{| 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;"Pluto in Orbiter"
!bgcolor="lightsteelblue" colspan="2" align="center" |Hydra
|-
|colspan="2" align="center"|[[Image:Hydra-nhplutoenc150703-Orbiter2016D3D9.jpg|Hydra|240px]]
|-
|colspan="2" align="center"|'''Hydra from ''Pluto and Moons.zip'' and ''New Horizons Pluto Encounter.zip'' in Orbiter 2016 with D3D9</center>
|-
!bgcolor="lightsteelblue" colspan="2"|Designation
|-
|Name||align="right"|Hydra
|-
|width="30%"|Reference body||align="right" width="30%"|134340 Pluto
|-
|width="30%"|Number of satellites||align="right" width="30%"|
|-
!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
|-
|width="30%"|Epoch||align="right" width="50%"|2002.88980151
|-
|width="30%"|Semimajor axis (a)||align="right" width="50%"|64780350.2435684 m
|-
|width="30%"|Eccentricity (e)||align="right" width="30%"|0.00527055475115776
|-
|width="30%"|Inclination (i)||align="right" width="30%"|0.249324421879577° <br> (0.00435153206743 radian)
|-
|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|30.4138815781564° <br> (0.530822371850478 radian)
|-
|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|336.913168368482° <br> (5.880244081356023 radian)
|-
|width="30%"|Mean longitude (L)||align="right" width="30%"|99.523168368531° <br> (1.73700697004754 radian)
|-
!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
|-
|width="30%"|Mean radius||align="right" width="30%"|64835.3502435684 m
|-
|width="30%"|Mass||align="right" width="30%"|1.25578958899498×10<sup>20</sup> kg
|-
|width="30%"|Sidereal rotation period||align="right" width="30%"|3510404.90311891104 sec (40.6297 hours)
|-
|width="30%"|SidRotOffset||align="right" width="30%"|0
|-
|width="30%"|Obliquity||align="right" width="30%"|96.145° (1.67804680932995 radian)
|-
|width="30%"|LAN||align="right" width="30%"|43.046° (0.7512944298135 radian)
|-
|width="30%"|Note||align="right" width="30%"|*Elements given are from Hyra.cfg (PlutoandMoons.zip)
|}

Hydra is the second largest natural satellite of [[Pluto]] after [[Charon]]. It was discovered in images by the [[w:Hubble Space Telescope|Hubble Space Telescope]] in May 2005 and was named after [[w:Lernaean Hydra|Hydra]], the nine-headed serpent in [[w:Greek mythology|Greek mythology]].

== Hydra in Orbiter ==
Hydra was introduced to Orbiter with the release of ''Nix-Hydra.zip'' in August 2009.

{| class="wikitable" style="text-align: center"
|colspan="8"|<center>'''Orbiter versions and add-ons which include Hydra'''</center>
|-
!Add-on!!Source!!Version!!Author!!Type!!Release Date!!Compatibility!!Wiki article
|-
|[https://www.orbiter-forum.com/resources/new-horizons-pluto-encounter.3045/ New Horizons Pluto Encounter]||O-F Resources||2015-07-09||BrianJ||Scenarios||9 July 2015||||
|-
|[https://www.orbiter-forum.com/resources/celestial-bodies-motion-part-2-4-v2-0-0.295/ Celestial Bodies Motion - Part 2/4 - v2.0.0]||O-F Resources||v2.0.0||cristiapi||Scenery||2 July 2015||*module only||
|-
|[https://www.orbiter-forum.com/resources/pluto-and-moons.978/ Pluto and Moons]||O-F Resources||2010-05-13||Piper||Scenery||13 May 2010||||
|-
|[https://www.orbiter-forum.com/resources/orbital-correction-for-pluto-and-moons.1388/ Orbital correction for Pluto and moons]||O-F Resources||2009-11-25||Unknown OHM Addon Developer||Scenery||25 November 2009||||
|-
|[https://www.orbiter-forum.com/resources/pluto-minor-moons.2251/ Pluto Minor Moons]||O-F Resources||2009-08-21||DagoO||Scenery||22 August 2009||||
|}

== Gallery ==
<gallery widths="100" heights="100">
Hydra-NixHydrazip-Orbiter2006P1.jpg|<center>Hydra from ''Nix-Hydra.zip'' in Orbiter 2006P1
Hydra-PlutoandMoonsZip-Orbiter2006P1.jpg|<center>Hydra from ''PlutoandMoons.zip'' in Orbiter 2006P1</center>
Hydra-nhplutoenc150703-Orbiter2016D3D9.jpg|<center>Hydra from ''Pluto and Moons.zip'' and ''New Horizons Pluto Encounter.zip'' in Orbiter 2016 with D3D9</center>
Hydra reprocessed.png|<center>Image of Hydra from the [[w:New Horizons|New Horizons]] spacecraft taken July 2015<br>from Wikimedia Commons</center>
Pluto and its satellites (2005).jpg|<center>Pluto and three satellites taken by [[w:Hubble Space Telescope|Hubble]]<br>from Wikimedia Commons in 2005</center>
Animation of moons of Pluto - Front view.gif|<center>Animation of the moons of Pluto (Pluto white, Charon blue, Styx green, Nix magenta, Kerberos cyan, Hydra red)<br>from Wikimedia Commons</center>
</gallery>

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[[Category:Celestial bodies]]
[[Category:Solar System]]
[[Category:Natural satellites]]