Universe Guide


Rhadamanthus is a Kuiper Belt object, a large rock that orbits round outside the orbit of Neptune. It has been categorised as a Trans-Neptunian object. It has an alternative name which is 1999 HX11.

Rhadamanthus was discovered on 1999-04-17 by Deep Ecliptic Survey. Its orbit takes 245.7870 years to travel round the Sun.

The absolute magnitude of the object is 7.1 which is the brightness of the object. A higher absolute magnitude means that the object is faint whereas a very low number means it is very bright.

The Aphelion of the object is 45.002 A.U. which is the point in the orbit that is furthest from the object that it is orbit. At this point, it will then return back to the orbit target. The Perihelion of the object is 33.262 A.U. which is the point in the orbit that is closest to the object that it is orbit around. The Longitude of Ascending Node of the object is 10.0 degrees. The Argument of Perihelion is 81.3. It is the angle along the orbit of a planet or other Solar System object as measured from the ascending node (analogous to right ascension and longitude) Ref:Hawaii.

The mean anomoly is 103.3, is the angular distance of the planet from the perihelion or aphelion. Ref:Dictionary.The Semi-Major Axis of the orbit is 39.132, which is the furthest point from the centre to the edge of an elliptical point.

The orbital inclination, the angle at which Rhadamanthus orbits in relation to the orbital plane is 12.7 degrees. The orbital eccentricity is 0.150, it is the degree at which Rhadamanthus orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Rhadamanthus Facts

TypeKuiper Belt Object
Alternative Name1999 HX11
Date of Discovery1999-04-17
DiscovererDeep Ecliptic Survey
Orbital Period245.7870
Absolute Magnitude7.1
Aphelion (Furthest)45.002 A.U.
Perihelion (Nearest)33.262 A.U.
Longitude Of Ascending Node10.0
Argument of Perihelion81.3
Mean Anomoly103.3
Semi-Major Axis39.132
Orbital Inclination (degrees)12.7
Orbital Eccentricity0.150

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