17 Thetis
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Discovery | |
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Discovered by: | R. Luther |
Discovery date: | April 17, 1852 |
Orbital characteristics | |
Epoch October 22, 2004 (JD 2453300.5) | |
Aphelion | 419.069 Gm (2.801 AU) |
Perihelion: | 319.991 Gm (2.139 AU) |
Semi-major axis: | 369.530 Gm (2.470 AU) |
Eccentricity: | 0.134 |
Orbital period: | 1418.027 d (3.88 a) |
Avg. orbital speed: | 18.87 km/s |
Mean anomaly: | 38.435° |
Inclination: | 5.587° |
Longitude of ascending node: | 125.622° |
Argument of perihelion: | 135.906° |
Physical characteristics | |
Dimensions: | 90 km |
Mass: | 7.6×1017 kg |
Mean density: | 2.0? g/cm³ |
Equatorial surface gravity: | 0.0252 m/s² |
Escape velocity: | 0.0476 km/s |
Rotation period: | 0.5113 d (12.27 h) [1] |
Albedo: | 0.1715 [2] |
Temperature: | ~173 K |
Spectral type: | S |
Absolute magnitude: | 7.76 |
17 Thetis is a big Main belt asteroid. It is a S-type asteroid, giving it a fairly bright silicate surface.
It was found by R. Luther on April 17, 1852. It was his first asteroid discovery. Its name comes from Thetis, the mother of Achilles in Greek mythology.
One stellar occultation of Thetis was seen from Oregon in 1999. However, the event was not timed.
[change] References
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16 Psyche | 17 Thetis | 18 Melpomene
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Near-Earth asteroids · Main belt · Jupiter Trojans · Neptune Trojans · Comets · Kuiper belt · Oort cloud |