1998 WW 31
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Asteroid 1998 WW 31 |
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| Properties of the orbit ( animation ) | |
| Orbit type | Transneptunian object |
| Major semi-axis | 44,484 AU |
| eccentricity | 0.089 |
| Perihelion - aphelion | 40.539 AU - 48.428 AU |
| Inclination of the orbit plane | 6.819 ° |
| Sidereal period | 296 a 251 d |
| Physical Properties | |
| Medium diameter | 133 ± 15 km |
| Dimensions | 1.7 × 10 18 kg |
| Medium density | 1.5 g / cm³ |
| Absolute brightness | 6.05 mag |
| history | |
| Explorer | Deep Ecliptic Survey |
| Date of discovery | November 18, 1998 |
| 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. | |
1998 WW 31 is a Trans-Neptunian object discovered by the Deep Ecliptic Survey on November 18, 1998 . Together with the object S / 2000 (1998 WW 31 ) 1, it forms the first discovered trans-Neptunian double system since the discovery of Pluto and is the best known as well as the most symmetrical double system in the solar system .
The two bodies have a very similar size, the ratio of their diameters is 1: 1.2, the ratio of their masses 1: 1.74, assuming similar surfaces and densities. Their orbital period around each other is about 570 days, their distance from each other between about 4,000 and 40,000 km, the major semi-axis being about 22,000 km. The diameter of the two objects is between 100 and 150 km, assuming a density of 1 to 2 g / cm³. Their combined mass is 1/6000 of the Pluto-Charon system.