Summary edit

(voir plus loin pour la description en français) Large Kuiper belt objects. Generated by a program written by Eurocommuter.

Main graph edit

• The position of an object represents
  • its orbit’s semi-major axis a in AU (horizontal axis)
  • orbit’s inclination i in degrees (vertical axis).
  • the eccentricity of the orbit is shown indirectly by a segment extending from the left (perihelion) to the aphelion to the right. In other words, the segment illustrates the variations of the object's distance from the Sun. Objects with nearly circular orbits will show short segments while highly elliptical orbits will be represented by long segments.
• Spheres
  • The size of the sphere illustrates the object’s size relative to others.
    • For some large objects, the diameter drawn represents the best current estimates.
    • For all others, the circles represent the absolute magnitude of the object.
  • Colour
    • The colours (corresponding to B-V,R-V indices) are represented when known. (Otherwise neutral colours are assumed).
  • Albedo
    • The differences in albedos are also illustrated (The range of albedos is wide; if shown directly the dim objects would be hardly visible. Instead, a logarithmic function is used.)
  • Labels
    • red for plutinos
    • blue for classical objects
    • grey for scattered objects
• Grid
  • Main resonances with Neptune are marked with vertical bars; 1:1 marks the position of Neptune’s orbit (and its Trojan asteroids), 2:3 marks the orbit of Pluto (and its moons) etc.

Data source edit

• Orbits and magnitudes: MPCORB as of Feb 14th, 2006
• Color indexes from MBOSS base: Hainaut & Delsanti (2002) Color of Minor Bodies in the Outer Solar System Astronomy & Astrophysics, 389, 641 [1] as of Mar. 13th, 2006

Description en français edit

Grands objets de la Ceinture de Kuiper et les objets épars. Graphe généré par un programme écrit par Eurocommuter.

Graphe principal edit

La position d’un objet représente

• le demi-grand axe de son orbite a en ua (unités astronomiques, l'axe horizontal)
• l’inclination de son orbite i en degrés (axe vertical).

Le diamètre du cercle montre la taille de l’objet relativement aux autres. Pour quelques grands objets, le diamètre représente la meilleure estimation connue. Pour tous les autres, le diamètre du cercle représente la magnitude absolue de l’objet. L’excentricité de l’orbite est représentée indirectement par un segment qui s’étend du périhélie à gauche) l’aphélie à droite. En d’autres termes, le segment illustre les variations de la distance du Soleil. Les objets avec des orbites quasi circulaires ont donc des courts segments et les orbites très excentriques sont repérées par des segments longs.

Les positions des résonances avec Neptune sont marqués par des traits verticaux; 1:1 marque la position de l’orbite de Neptune (et ses Troyens), 2:3 marque l’orbite de Pluton (et ses lunes), etc.

Source des données edit

La base de données MPCORB au 14 février 2006.

Licensing edit

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