Janus

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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

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

Janus at Wikipedia

Gallery

  • 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 | Bestla | 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 S 7 | S/2004 S 12 | S/2004 S 13 | S/2004 S 17 | S/2004 S 21 | S/2004 S 24 | S/2004 S 26 | S/2004 S 28 | S/2004 S 29 | S/2004 S 31 | S/2004 S 34 | S/2004 S 36 | S/2004 S 37 | S/2004 S 39 | S/2004 S 40 | S/2004 S 41 | S/2004 S 42 | S/2004 S 43 | S/2004 S 44 | S/2004 S 45 | S/2004 S 46 | S/2004 S 47 | S/2004 S 48 | S/2004 S 49 | S/2004 S 50 | S/2004 S 51 | S/2004 S 52 | S/2004 S 53 | S/2005 S 4 | S/2005 S 5 | S/2006 S 1 | S/2006 S 3 | S/2006 S 9 | S/2006 S 10 | S/2006 S 11 | S/2006 S 12 | S/2006 S 13 | S/2006 S 14 | S/2006 S 15 | S/2006 S 16 | S/2006 S 17 | S/2006 S 18 | S/2006 S 19 | S/2006 S 20 | S/2007 S 2 | S/2007 S 3 | S/2007 S 5 | S/2007 S 6 | S/2007 S 8 | S/2007 S 9 | S/2009 S 1 | S/2019 S 1 | S/2019 S 2 | S/2019 S 3 | S/2019 S 4 | S/2019 S 5 | S/2019 S 6 | S/2019 S 7 | S/2019 S 8 | S/2019 S 9 | S/2019 S 10 | S/2019 S 11 | S/2019 S 12 | S/2019 S 13 | S/2019 S 14 | S/2019 S 15 | S/2019 S 16 | S/2019 S 17 | S/2019 S 18 | S/2019 S 19 | S/2019 S 20 | S/2019 S 21 | S/2020 S 1 | S/2020 S 2 | S/2020 S 3 | S/2020 S 4 | S/2020 S 5 | S/2020 S 6 | S/2020 S 7 | S/2020 S 8 | S/2020 S 9 | S/2020 S 10

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