In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. They are named after Pluto, which also has this same orbital resonance. The centaurs are a class of icy planetoids that orbit the Sun between Jupiter and Neptune, named after the mythical race of centaurs. ... A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ... Artists rendering of the Kuiper Belt and more distant Oort cloud. ... A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets. ... While a Plutino completes 2 orbits around the Sun in the time it takes Neptune to complete 3 orbits, a Twotino makes 1 orbit around the Sun in the time it takes Neptune to complete 2 orbits. ... The scattered disc (or scattered disk) is a distant region of our solar system, thinly populated by a subset of the family of trans-Neptunian objects known as scattered disk objects (SDOs). ... This image is an artists rendering of the Oort cloud and the Kuiper Belt. ... Astrometry: the study of the position of objects in the sky and their changes of position. ... A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ... In celestial mechanics, orbital resonance occurs when two orbiting bodies have periods of revolution that are in a simple integer ratio so that they exert a regular gravitational influence on each other. ... Atmospheric characteristics Surface pressure ≫100 MPa Hydrogen - H2 80% ±3. ... Atmospheric characteristics Atmospheric pressure 0. ...
Plutinos form the inner part of the Kuiper belt. About 1/4 of known Kuiper Belt objects (KBOs) are Plutinos. Artists rendering of the Kuiper Belt and more distant Oort cloud. ...
Also considered to be similar to the plutinos are: 90482 Orcus (originally known by the provisional designation 2004 DW) is a Kuiper Belt object (KBO) that was discovered by Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale University. ... (28978) Ixion (ik·sye·un) is a Kuiper belt object discovered on May 22, 2001 with a diameter of < 822 km and a semimajor axis of about 39. ... 38083 Rhadamanthus (formerly known as (38083) 1999 HX11) is a trans-Neptunian object. ... 38628 Huya (original provisional designation: 2000 EB173) is a trans-Neptunian object. ...
Since Pluto fits the 3:2 orbital resonance, it is sometimes convenient to include Pluto itself when referring to that orbital category of objects as plutinos. However, others argue that because plutino means little Pluto, Pluto itself can't be a little Pluto. Charon (shair-un or kair-un, Greek ΧάÏων) is the only known satellite of Pluto. ... Atmospheric characteristics Atmospheric pressure 0. ... Discovery images of S/2005 P 2. ... Atmospheric characteristics Atmospheric pressure 0. ... Discovery images of S/2005 P 1. ... Atmospheric characteristics Atmospheric pressure 0. ...
By extrapolating from the limited area of the sky so far examined, we have estimated that the number of Plutinos larger than 100 km diameter is 1400, to within a factor of a few, corresponding to a few % of the total.
First, the Plutinos are observationally over-assessed due to their being closer (brighter), on average, than the Classical KBOs giving rise to an observational bias in favor of the Plutinos.
Pluto is distinguished from the Plutinos by its size: it is the largest object identified to date in the 3:2 resonance.
Despite their often extreme proximity to Neptune's orbit, the plutinos do not in fact have the possibility of encountering Neptune itself, because the periods of revolution about the sun of the plutinos and Neptune are precisely in a ratio of three to two.
This means that, after three revolutions of Neptune and two of a plutino (about 500 years), the relative positions of the objects in their orbits repeat, and this cycle does not give the bodies an opportunity to pass within 10 or more astronomical units of each other.
And whereas the plutinos orbit the sun at an average distance of 39 astronomical units, cubewanos have average distances over the range 42-46 astronomical units.
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