2000 CR105
Encyclopedia
, also written as 2000 CR105, is currently about the seventh-most-distant known object in the Solar System
. Considered a detached object, it orbits the Sun in a highly eccentric orbit every 3345 years at an average distance of 223 astronomical unit
s (AU).
Suggested diameters of are 253 km and 375 km.
and Sedna
differ from scattered-disc
objects in that they are not within the gravitational influence of the planet Neptune
at their perihelion
distances. It is something of a mystery how these objects came to be in their current far-flung orbits. Several hypotheses have been put forward:
Solar System
The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The vast majority of the system's mass is in the Sun...
. Considered a detached object, it orbits the Sun in a highly eccentric orbit every 3345 years at an average distance of 223 astronomical unit
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
s (AU).
Suggested diameters of are 253 km and 375 km.
and Sedna
90377 Sedna
90377 Sedna is a trans-Neptunian object discovered in 2003, which was about three times as far from the Sun as Neptune. For most of its orbit it is even further from the Sun, with its aphelion estimated at 960 astronomical units , making it one of the most distant known objects in the Solar System...
differ from scattered-disc
Scattered disc
The scattered disc is a distant region of the Solar System that is sparsely populated by icy minor planets, a subset of the broader family of trans-Neptunian objects. The scattered-disc objects have orbital eccentricities ranging as high as 0.8, inclinations as high as 40°, and perihelia greater...
objects in that they are not within the gravitational influence of the planet Neptune
Neptune
Neptune is the eighth and farthest planet from the Sun in the Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times...
at their perihelion
Apsis
An apsis , plural apsides , is the point of greatest or least distance of a body from one of the foci of its elliptical orbit. In modern celestial mechanics this focus is also the center of attraction, which is usually the center of mass of the system...
distances. It is something of a mystery how these objects came to be in their current far-flung orbits. Several hypotheses have been put forward:
- They were pulled from their original positions by a passing starStarA star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
. - They were pulled from their original positions by a very distant and as-yet-undiscovered (albeit unlikely) giant planetPlanetA planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...
. - They were pulled from their original positions by an as-yet-undiscovered companion star orbiting the Sun: see Nemesis (hypothetical star).
- They were captured from another planetary systemPlanetary systemA planetary system consists of the various non-stellar objects orbiting a star such as planets, dwarf planets , asteroids, meteoroids, comets, and cosmic dust...
during a close encounter early in the Sun's history. According to Kenyon and Bromley, there is a 15% probability that a star like the Sun had an early close encounter, and a 1% probability that outer planetary exchanges would have happened. is estimated to be 2–3 times more likely to be a captured planetary object than Sedna.
External links
- Orbital simulation from JPLJet Propulsion LaboratoryJet Propulsion Laboratory is a federally funded research and development center and NASA field center located in the San Gabriel Valley area of Los Angeles County, California, United States. The facility is headquartered in the city of Pasadena on the border of La Cañada Flintridge and Pasadena...
(Java) / Ephemeris - Orbit Determination of
- Spacecraft escaping the Solar System (Heavens-Above)
- World Book: Worlds Beyond Pluto