Difference between revisions of "Janus"

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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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Janus is a natural satellite of [[Saturn]].
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!bgcolor="lightsteelblue" colspan="2" align="center" |Janus
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|colspan="2" align="center"|[[Image:Janus021015.jpg|240px]]
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|-
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|colspan="2" align="center"|'''Janus in Orbiter 2016 with D3D9 client'''
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|-
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!bgcolor="lightsteelblue" colspan="2"|Designation
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|-
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|Name||align="right"|Janus
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|-
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|width="30%"|Reference body||align="right" width="30%"|Saturn
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|-
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!bgcolor="lightsteelblue" colspan="2"|Planetary mean orbits
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|-
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|width="30%"|Epoch||align="right" width="50%"|1999.0
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|-
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|width="30%"|Semimajor axis (a)||align="right" width="50%"|1.515×10<sup>8</sup> m
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|-
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|width="30%"|Eccentricity (e)||align="right" width="30%"|0.0073
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|-
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|width="30%"|Inclination (i)||align="right" width="30%"|0.1604284826° <br> (0.0028 radian)
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|-
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|width="30%"|Longitude of the ascending node (LAN, ☊)||align="right" width="30%"|303.7936821° <br> (5.3022 radian)
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|-
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|width="30%"|Longitude of periapsis (ϖ)||align="right" width="30%"|140.3230936° <br> (2.4491 radian)
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|-
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|width="30%"|Mean longitude (L)||align="right" width="30%"|32.99663942° <br> (0.5759 radian)
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|-
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!bgcolor="lightsteelblue" colspan="2"|Selected physical parameters
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|-
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|width="30%"|Mean radius||align="right" width="30%"|178000 m
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|width="30%"|Mass||align="right" width="30%"|2.01×10<sup>18</sup> kg
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|width="30%"|Note||align="right" width="30%"|*Elements given are from Janus.cfg (isaturn.zip)
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|}
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'''Janus (Saturn X, S/1966 S 2)''' is one of the inner [natural satellites|moons]] of [[Saturn]]. It was discovered by [[w:Audouni Dollfus|Audouoin Dollfus]] on 15 December 1966. However, Jean Teereau had imaged Janus on 29 October the same year, but, did not recognize it as a new body. Janus was named for [[w:Janus|Janus]] of Roman mythology.
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Janus is co-orbital with [[Epimetheus]] in that when Janus' orbit is slightly smaller than that of Epimetheus, over time, Janus will catch up with Epimetheus, as it makes its approach, it is slightly drawn toward Epimetheus adding orbiter energy placing it in a slightly larger orbit, then it will slow down and recede from Epimetheus, and over time Epimetheus will catch up to it. So, they 'swap orbits' so to speak. This occurs about every four years.
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== Janus in Orbiter ==
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Janus was first introduced to Orbiter with the release of ''isaturn.zip'' in October 2002.
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{|class="wikitable sortable” style="text-align: center"
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|-
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|colspan="8"|<center>'''Orbiter versions and add-ons which include Janus'''</center>
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|-
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!Add-on!!Source!!Version!!Author!!Type!!Release Date!!Compatibility!!Wiki article
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|-
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|[https://library.avsim.net/esearch.php?DLID=&Name=&FileName=isaturn.zip&Author=&CatID=root Inner Moons of Saturn]||AVSIM||||Rolf Keibel||Scenery||15 October 2002||||
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|}
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== See also ==
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[[w:Janus (moon)|Janus]] at [[w:Wikipedia|Wikipedia]]
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== Gallery ==
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<gallery>
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Janus021015.jpg|<center>Janus from isaturn.zip in Orbiter 2002</center>
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PIA12714 Janus crop.jpg|<center>Janus as seen by the [[w:Cassini-Huygens|Cassini]] spacecraft on 7 April 2010,<br>from Wikimedia Commons</center>
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Epimetheus-Janus Orbit.png|<center>Illustration of the 'horseshoe' orbits of Epimetheus and Janus showing their co-orbiting. Saturn's size and orbital radius are close to scale, but, the inner to outer distance is exaggerrated about 500× and the sizes of the moons are exaggerated about 50 times.<br>From Wikimedia Commons
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</gallery>
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{{SaturnSat}}
 
{{SaturnSat}}
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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:Natural satellites]]
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[[Category:Satellites of Saturn]]
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{{Nsat-Stub}}
 
{{Nsat-Stub}}

Latest revision as of 11:18, 12 September 2024

Janus
Janus021015.jpg
Janus in Orbiter 2016 with D3D9 client
Designation
Name Janus
Reference body Saturn
Planetary mean orbits
Epoch 1999.0
Semimajor axis (a) 1.515×108 m
Eccentricity (e) 0.0073
Inclination (i) 0.1604284826°
(0.0028 radian)
Longitude of the ascending node (LAN, ☊) 303.7936821°
(5.3022 radian)
Longitude of periapsis (ϖ) 140.3230936°
(2.4491 radian)
Mean longitude (L) 32.99663942°
(0.5759 radian)
Selected physical parameters
Mean radius 178000 m
Mass 2.01×1018 kg
Note *Elements given are from Janus.cfg (isaturn.zip)

Janus (Saturn X, S/1966 S 2) is one of the inner [natural satellites|moons]] of Saturn. It was discovered by Audouoin Dollfus on 15 December 1966. However, Jean Teereau had imaged Janus on 29 October the same year, but, did not recognize it as a new body. Janus was named for Janus of Roman mythology.

Janus is co-orbital with Epimetheus in that when Janus' orbit is slightly smaller than that of Epimetheus, over time, Janus will catch up with Epimetheus, as it makes its approach, it is slightly drawn toward Epimetheus adding orbiter energy placing it in a slightly larger orbit, then it will slow down and recede from Epimetheus, and over time Epimetheus will catch up to it. So, they 'swap orbits' so to speak. This occurs about every four years.

Janus in Orbiter[edit]

Janus was first introduced to Orbiter with the release of isaturn.zip in October 2002.

Orbiter versions and add-ons which include Janus
Add-on Source Version Author Type Release Date Compatibility Wiki article
Inner Moons of Saturn AVSIM Rolf Keibel Scenery 15 October 2002

See also[edit]

Janus at Wikipedia

Gallery[edit]

  • Janus from isaturn.zip in Orbiter 2002
  • Janus as seen by the Cassini spacecraft on 7 April 2010,
    from Wikimedia Commons
  • Illustration of the 'horseshoe' orbits of Epimetheus and Janus showing their co-orbiting. Saturn's size and orbital radius are close to scale, but, the inner to outer distance is exaggerrated about 500× and the sizes of the moons are exaggerated about 50 times.
    From Wikimedia Commons


Saturn's natural satellites

edit

Named Satellites: Aegaeon | Aegir | Albiorix | Alvaldi | Angrboda | Anthe | Atlas | Bebhionn | Beli | Bergelmir | Bestia | Calypso | Daphnis | Dione | Eggther | Enceladus | Epimetheus | Erriapus | Farbauti | Fenrir | Fornjot | Geirrod | Gerd | Greip | Gridr | Gunnlod | Hati | Helene | Hyperion | Hyrrokkin | Iapetus | Ijiraq | Janus | Jarnsaxa | Kari | Kiviuq | Loge | Methone | Mimas | Mundilfari | Narvi | Paaliaq | Pallene | Pan | Pandora | Phoebe | Polydeuces | Prometheus | Rhea | Siarnaq | Skathi | Skoll | Skrymir | Surtur | Suttungr | Tarqeq | Tarvos | Telesto | Tethys | Thiazzi | Thrymr | Titan | Ymir

Numbered Satellites: S/2004 S7 | S/2004 S12 | S/2004 S13 | S/2004 S17 | S/2004 S21 | S/2004 S24 | S/2004 S26 | S/2004 S28 | S/2004 S29 | S/2004 S31 | S/2004 S34 | S/2004 S36 | S/2004 S37 | S/2004 S39 | S/2004 S40 | S/2004 S41 | S/2004 S42 | S/2004 S43 | S/2004 S44 | S/2004 S45 | S/2004 S46 | S/2004 S47 | S/2004 S48 | S/2004 S49 | S/2004 S50 | S/2004 S51 | S/2004 S52 | S/2004 S53 | S/2005 S4 | S/2005 S5 | S/2006 S1 | S/2006 S3 | S/2006 S9 | S/2006 S10 | S/2006 S11 | S/2006 S12 | S/2006 S13 | S/2006 S14 | S/2006 S15 | S/2006 S16 | S/2006 S17 | S/2006 S18 | S/2006 S19 | S/2006 S20 | S/2007 S2 | S/2007 S3 | S/2007 S5 | S/2007 S6 | S/2007 S8 | S/2007 S8 | S/2007 S9 | S/2009 S1 | S/2019 S1 | S/2019 S2 | S/2019 S3 | S/2019 S4 | S/2019 S5 | S/2019 S6 | S/2019 S7 | S/2019 S8 | S/2019 S9 | S/2019 S10 | S/2019 S11 | S/2019 S12 | S/2019 S13 | S/2019 S14 | S/2019 S15 | S/2019 S16 | S/2019 S17 | S/2019 S18 | S/2019 S19 | S/2019 S20 | S/2019 S21 | S/2020 S1 | S/2020 S2 | S/2020 S3 | S/2020 S4 | S/2020 S5 | S/2020 S6 | S/2020 S7 | S/2020 S8 | S/2020 S9 | S/2020 S10

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