Paaliaq (moon)
Paaliaq | |
---|---|
Provisional or systematic name | S / 2000 S 2 |
Central body | Saturn |
Properties of the orbit | |
Major semi-axis | 15,198,000 km |
Periapsis | 9,667,000 km |
Apoapsis | 20,733,000 km |
eccentricity | 0.364 |
Orbit inclination | 45.13 ° |
Orbital time | 686.9 d |
Mean orbital velocity | 1.61 km / s |
Physical Properties | |
Albedo | 0.06 |
Apparent brightness | 21.3 mag |
Medium diameter | ≈ 22 km |
Dimensions | ≈ 8.2 × 10 15 kg |
Medium density | 2.3 g / cm 3 |
Sidereal rotation | ≈ 18 h 47 min |
Acceleration of gravity on the surface | ≈ 0.0045 m / s 2 |
Escape speed | ≈ 10.0 m / s |
discovery | |
Explorer |
Brett Gladman et al. |
Date of discovery | August 7, 2000 |
Paaliaq (also Saturn XX) is one of the smaller outer moons of the planet Saturn .
discovery
The discovery of Paaliaq 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 August 7th until September 24, 2000 was announced on October 25, 2000. Paaliaq was initially given the provisional designation S / 2000 S 2. In August 2003, the moon was named after a fictional character in the book "The Curse of the Shaman" by Michael Kusugak .
Orbit data
Paaliaq orbits Saturn on an eccentric orbit at an average distance of 15,198,000 km in around 687 days. The orbital eccentricity is 0.3632, whereby the orbit is strongly inclined at 45.077 ° against the ecliptic , which at this distance from Saturn represents the Laplace plane .
Paaliaq belongs to the Inuit group of Saturn's moons.
Structure and physical data
Paaliaq has a diameter of 19 km. Its density of 2.3 g / m 3 is relatively high compared to the other Saturnian moons. 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 21.3 m , it is an extremely faint object.
Web links
- IAUC 7512: S / 2000 S 1 and S / 2000 S 2 October 25, 2000 (discovery)
- MPEC 2000-Y15: S / 2000 S 1, S / 2000 S 2, S / 2000 S 7, S / 2000 S 8, S / 2000 S 9 December 19, 2000 (ephemeris)
- MPEC 2001-T06: S / 2000 S 1, S / 2000 S 2, S / 2000 S 4, S / 2000 S 6, S / 2000 S 12 October 6, 2001 (rediscovery)
- IAUC 8177: Satellites of Jupiter, Saturn, Uranus August 8, 2003 (numbering and naming)
Individual evidence
- ↑ 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 |
Phoebe |
Semi- major axis (km) Paaliaq 15,200,000 |
Skathi |