Ijiraq (moon)

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Ijiraq
Provisional or systematic name S / 2000 S 6
Central body Saturn
Properties of the orbit
Major semi-axis 11,125,000 km
Periapsis 7,543,000 km
Apoapsis 14,707,000 km
eccentricity 0.322
Orbit inclination 46.74 °
Orbital time 451.5 d
Mean orbital velocity 1.79 km / s
Physical Properties
Albedo 0.06
Apparent brightness 22.6 mag
Medium diameter ≈ 12 km
Dimensions ≈ 1.2 × 10 15 kg
Medium density 2.3 g / cm 3
Sidereal rotation ≈ 13 h 02 min
Acceleration of gravity on the surface ≈ 0.0022 m / s 2
Escape speed ≈ 5.1 m / s
discovery
Explorer

Brett Gladman et al.

Date of discovery November 18, 2000

Ijiraq (also Saturn XXII) is one of the smaller outer moons of the planet Saturn .

discovery

The discovery of Ijiraq by a team of Brett Gladman , John J. Kavelaars , Jean-Marc Petit, Hans Scholl , Matthew J. Holman , Brian G. Marsden , Philip D. Nicholson and Joseph A. Burns on September 23rd through November 4, 2000 was announced on November 18, 2000. Ijiraq initially received the provisional designation S / 2000 S 6 was named the moon after Ijiraq , a giant from the mythology of the Inuit .

Orbit data

Ijiraq orbits Saturn on an eccentric orbit at an average distance of 11,442,000 km in around 451 days and 11 hours. The orbital eccentricity is 0.3215, with the orbit at 46.750 ° being strongly inclined towards the ecliptic , which at this distance from Saturn represents the Laplace plane .

Ijiraq belongs to the Inuit group of Saturn's moons.

Structure and physical data

Ijiraq has a diameter of 10 km. Its density of 2.3 g / cm 3 is relatively high compared to the other moons of Saturn. It is probably composed of water ice with a high proportion of silicate rock. It has a very dark surface with an albedo of 0.06, i.e. That is, only 6% of the incident sunlight is reflected . With an apparent brightness of 22.6 m , it is an extremely faint object.

Web links

Commons : Ijiraq  - collection of images, videos and audio files

Individual evidence

  1. ↑ T. Denk, S. Mottola (2019): Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations. Icarus 322 , 80-102. DOI: 10.1016 / j.icarus.2018.12.040 .
further inside Saturn moons further outside
Kiviuq
Semi- major axis  (km) Ijiraq 11,124,000		 Phoebe
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