Tarvos (moon)
| Tarvos | |
|---|---|
| Provisional or systematic name | S / 2000 S 4 |
| Central body | Saturn |
| Properties of the orbit | |
| Major semi-axis | 17,982,000 km |
| Periapsis | 8,344,000 km |
| Apoapsis | 27,620,000 km |
| eccentricity | 0.536 |
| Orbit inclination | 33.51 ° |
| Orbital time | 926.1 d |
| Mean orbital velocity | 1.41 km / s |
| Physical Properties | |
| Albedo | 0.06 |
| Apparent brightness | 22.1 mag |
| Medium diameter | ≈ 15 km |
| Dimensions | ≈ 2.7 × 10 15 kg |
| Medium density | 2.3 g / cm 3 |
| Acceleration of gravity on the surface | ≈ 0 m / s 2 |
| Escape speed | ≈ 0 m / s |
| discovery | |
| Explorer |
Brett Gladman et al. |
| Date of discovery | October 25, 2000 |
Tarvos (also Saturn XXI) is one of the smaller outer moons of the planet Saturn .
discovery
The discovery of Tarvos by a team consisting of Brett J. Gladman , John J. Kavelaars , Jean-Marc Petit, Hans Scholl , Matthew J. Holman , Brian Marsden , Philip D. Nicholson and Joseph A. Burns on recordings from 23 to as of September 27, 2000 was announced on October 25, 2000. Tarvos initially received the provisional designation S / 2000 S 4.
The moon was named after Tarvos Trigaranus , a god of Celtic mythology .
Orbit data
Tarvos orbits Saturn on an eccentric orbit at an average distance of 18,239,000 km in around 926 days and 3 hours. The orbital eccentricity is 0.5365, with the orbit at 33.495 ° strongly inclined towards the ecliptic , which at this distance from Saturn represents the Laplace plane .
Tarvos belongs to the Gallic group of Saturn's moons.
Structure and physical data
Tarvos has a diameter of 13 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 22.1 m , it is an extremely faint object.
Web links
- IAUC 7513: S / 2000 S 3 and S / 2000 S 4 October 25, 2000 (discovery)
- IAUC 8177: Satellites of Jupiter, Saturn, Uranus August 8, 2003 (numbering and naming)
- MPEC 2000-Y14: S / 2000 S 3, S / 2000 S 4, S / 2000 S 5, S / 2000 S 6, S / 2000 S 10 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)
| further inside | Saturn moons | further outside |
| Tarqeq |
Semi- major axis (km) Tarvos 17,983,000 |
Greip |