17 Thetis

17 Thetis
	Star field shawin asteroid Thetis in the center
Discovery
Discovered bi	R. Luther
Discovery date	Aprile 17, 1852
Designations
Pronunciation	/ˈθiːtᵻs/ THEE-tis
Named after	Thetis
Alternative names	A913 CA; A916 YF;; 1954 SO1
Minor planet category	Main belt
Adjectives	Thetidian
Orbital chairactereestics
	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)
Average orbital speed	18.87 km/s
Mean anomaly	38.435°
Inclination	5.587°
Longitude o ascendin node	125.622°
Argument o perihelion	135.906°
Pheesical chairacteristics
Dimensions	90 ± 3.7 km (IRAS)
Mass	1.2×1018 kg
Mean density	3.21 ± 0.92 g/cm³
Surface gravity	0.0252 m/s²
Escape velocity	0.0476 km/s
Rotation period	0.5113 d (12.27 h)
Albedo	0.1715
Temperatur	~173 K
Spectral teep	S
Apparent magnitude	9.89 to 13.51
Absolute magnitude (H)	7.76

17 Thetis is a lairge main-belt asteroid that wis discovered bi R. Luther on Aprile 17, 1852.

References

1 2 3 4 5 6 "JPL Small-Body Database Browser: 17 Thetis". 4 August 2008. Retrieved 12 November 2008.
1 2 Baer, James; Steven R. Chesley (2007). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy. Springer Science+Business Media B.V. 2007. 100 (2008): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. Archived frae the original (PDF) on 24 Februar 2011. Retrieved 12 November 2008.
↑ (Mass o Thetis 0.00617 / Mass o Ceres 4.75) * Mass o Ceres 9.43E+20 = 1.224E+18
↑ "LIGHTCURVES AND MAP DATA ON NUMBERED ASTEROIDS N° 1 TO 52225". AstroSurf. Archived frae the original on 27 November 2005. Retrieved 3 November 2008.Archived 2005-11-27 at the Wayback Machine
↑ "Asteroid Data Archive". Planetary Science Institute. Archived frae the original on 23 Juin 2006. Retrieved 3 November 2008.
↑ apmag 9.89 (1977-Jul-25) to 13.51 (1963-Aug-02) JPL Horizons daily output for 1950 to 2099