(189) Phthia
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Asteroid (189) Phthia |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.451 AU |
| eccentricity | 0.036 |
| Perihelion - aphelion | 2.364 AU - 2.538 AU |
| Inclination of the orbit plane | 5.2 ° |
| Length of the ascending node | 203.5 ° |
| Argument of the periapsis | 167.5 ° |
| Time of passage of the perihelion | February 23, 2009 |
| Sidereal period | 3 a 306 d |
| Mean orbital velocity | 19.0 km / s |
| Physical Properties | |
| Medium diameter | (37.7 ± 2.0) km |
| Albedo | 0.23 |
| Rotation period | 22.3 h |
| Absolute brightness | 9.3 mag |
| Spectral class | S. |
| history | |
| Explorer | CHF Peters |
| Date of discovery | September 9, 1878 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(189) Phthia is an asteroid of the main asteroid belt that was discovered on September 9, 1878 by Christian Heinrich Friedrich Peters . The celestial body was named after Phthia , daughter of Phoroneus and mother of Achaios from Greek mythology .
Phthia moves at a distance of 2.4 ( perihelion ) to 3.5 ( aphelion ) astronomical units in 3.836 years around the sun . The orbit is inclined 5.2 ° to the ecliptic , the orbital eccentricity is 0.04. Phthia has a diameter of 38 kilometers. It has a light, silicate-containing surface with an albedo of 0.23.