(4769) Castalia
|
Asteroid (4769) Castalia |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Apollo type |
| Major semi-axis | 1.0632 AU |
| eccentricity | 0.4832 |
| Perihelion - aphelion | 0.5495 AU - 1.5770 AU |
| Inclination of the orbit plane | 8.886 ° |
| Sidereal period | 400.4 days |
| Physical Properties | |
| Medium diameter | 1.8 × 0.8 km |
| Dimensions | ? kg |
| Albedo | ? |
| Medium density | ? g / cm³ |
| Rotation period | 4.09 hours |
| Absolute brightness | 16.9 mag |
| Spectral class | ? |
| history | |
| Explorer | Eleanor F. Helin |
| Date of discovery | August 9, 1989 |
| Another name | 1989 PB |
| 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. | |
(4769) Castalia is a near-Earth asteroid (group of near-earth objects ) that was discovered on August 9, 1989 by Eleanor F. Helin at the Palomar Observatory .
It is named after the nymph Kastalia from Greek mythology .
Castalia moves at a distance of 0.5495 AU ( perihelion ) to 1.5770 AU ( aphelion ) around the Sun in about 400 days . The eccentricity of the orbit is 0.4832, the orbit being inclined at 8.886 ° to the ecliptic .
In August 1989, Castalia passed the earth at a distance of eleven times the moon and could be observed using radar . It turned out that the asteroid is composed of two 800-meter-large parts and is shaped like a peanut. Observations of other asteroids have shown that such double bodies are not uncommon. They can form when two larger objects collide with each other at low speeds of a few centimeters per second and remain connected.