(189) Phthia
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.