Plutino

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Diagram in which the orbital half-axes of the larger plutinos (in AU, horizontal axis) are plotted against their orbital inclination (in °, vertical axis). The circle sizes are only intended to illustrate the relative asteroid radii and are not to scale to the orbit elements. The horizontal lines represent the space between the perihelion and aphelion of the respective plutinous orbit.

As Plutinos , not to be confused with Plutoiden be in the astronomy of those objects Kuiper Belt designated whose orbital elements with those of Pluto are comparable. These orbits are a 3: 2 - resonance to the orbit of the planet Neptune stabilized, that is, during three Neptunumläufe they orbit the sun twice. This synchronization avoids close encounters with Neptune, so that only such orbits around this extreme giant planet are stable over a longer period of time. Alongside the Twotinos, the Plutinos are the best-known resonant Kuiper belt objects .

The first four Plutinos were discovered on four consecutive days from September 14-17, 1993, 63 years after Pluto. Currently, the number of larger Plutinos (over 100 km) is estimated to be more than 1000. These estimates are still very vague, however, as only little data is available on the Kuiper Belt Objects (KBO).

Probable origin

During the formation of the solar system , planetesimals were hurled into the outer area (Kuiper belt and Oort cloud ) by the gas giants , which enlarged Neptune's orbit. By means of simulation calculations, it was possible to prove that on his way he "pushed" the objects already present in front of him in the 3: 2 resonance like a snow plow .

Well-known great Plutinos

Surname diameter major semi-axis Perihelion Aphelion Orbital time Orbit inclination eccentricity Opposition brightness 2008 Opposition brightness in the perihelion
(134340) Pluto 2374 km 39.48 AU 29.66 AU 49.3 AU 248 years 17.2 ° 0.249 14, m 1 13, m 8
Charon 1208 km Biggest moon of Pluto
(90482) Orcus 0917 km 39.45 AU 30.84 AU 48.07 AU 248 years 20.6 ° 0.218 19, m 1 17, m 2
(28978) Ixion 0617 km 39.56 AU 30.00 AE 49.11 AU 249 years 19.6 ° 0.242 19, m 4 18, m 0
(38628) Huya 0406 km 39.70 AU 28.53 AU 50.86 AU 250 years 15.5 ° 0.281 19, m 3 19, m 3
(47171) Lempo 0393 km
  (effective) 		39.24 AU 30.55 AU 47.93 AU 246 years 08.4 ° 0.221 19, m 8 19, m 7
(15789) 1993 SC 0328 km 39.37 AU 32.12 AU 46.62 AU 247 years 05.2 ° 0.184 22, m 5 21, m 9
(15810) Arawn 251 km 39.60 AU 34.75 AU 44.45 AU 249 years 3.8 ° 0.122
(15788) 1993 SB 0130 km 39.22 AU 26.73 AU 51.7 0AU 246 years 01.9 ° 0.319 22, m 4 21, m 9
(385185) 1993 RO 0090 km 39.1 0AU 31.48 AU 46.7 0AU 244 years 03.7 ° 0.195 23, m 0 22, m 9

See also

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