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 Trans-Neptunian object - Wikipedia, the free encyclopedia
Pluto and its moon Charon are trans-Neptunian objects, and if Pluto had been discovered today, it might not have been called a planet.
The diameter of the smaller objects is estimated by assuming an albedo: the diameter of such bodies should be taken to be a rough guess.
It is difficult to estimate the diameter of TNOs. /wiki/Trans-Neptunian_object   (818 words)

The abbreviation for a trans-Neptunian Object is TNO.
Trans-Neptunian Object - A Trans-Neptunian Object is any natural object in space that orbits outside of planet Neptune's orbit.
Comet - A comet is an object in space that orbits the Sun. /kids/expvoc1.html   (1068 words)

 A Kuiper Belt Glossary
The orbits of the Centaurs are dynamically unstable due to interactions with the giant planets, so they must be transition objects from a larger reservoir of small bodies to potentially active inner solar system objects.
Objects in the scattered disk may be escapees from the Kuiper belt and/or may be scattered Uranus-Neptune planetesimals.
I.e., an object's phase angle is the angular separation (elongation) between the Sun and the Earth as would be observed from that object. /ekonews/glossary.html   (1136 words)

 Zoom Astronomy Glossary: T
Trans Neptunian Objects (TNO's) are small planetesimals made of rock and ice that orbit our Sun past the planet Neptune.
The hypothesized origin of this hypothetical object is that a celestial object, perhaps a hard-to-detect cool, brown dwarf star (called Nemesis), was captured by the Sun's gravitational field.
Triton is the coldest object that has been measured in our Solar System, with a temperature of -235° C (-391° F). /subjects/astronomy/glossary/indext.shtml   (2974 words)

 Plot of the Outer Solar System
Unusual high-e objects are shown as cyan triangles, Centaur objects as orange triangles, Plutinos (objects in 2:3 resonance with Neptune) as white circles (Pluto itself is the large white symbol), scattered-disk objects as magenta circles and "classical" or "main-belt" objects as red circles.
Objects observed at only one opposition are denoted by open symbols, objects with multiple-opposition orbits are denoted by filled symbols.
In this view, objects in direct orbits (most of the objects in this plot) move counterclockwise and the vernal equinox is towards the right. /iau/lists/OuterPlot.html   (261 words)

 Origin of Trans-Neptunian Asteroids
If the trans-Neptunian objects are debris from an exploded planet, as a great deal of evidence suggests is the case for main-belt asteroids, then their initial orbits would have to exhibit a wide range of eccentricities, inclinations, and mean distances from the Sun.
If the trans-Neptunian objects are from a parent body that exploded, the 35,000 number mentioned earlier can be combined with a mean diameter of, say, 150 km each to imply a parent body at least 5000 km in diameter, the size of Saturn’s moon Titan.
The object Chiron is another example of the dilemma, since it was first assumed to be a large asteroid in a planet-like orbit crossing the orbits of Saturn and Uranus. /solar%20system/asteroids/trans-NeptunianAsteroids.asp   (1533 words)

 Exploring the Trans-Neptunian Solar System
In addition, studies of the physical and chemical properties of all trans-neptunian objects would be enhanced by the availability of high-quantum-efficiency array detectors (~1 to 10 microns for studies of reflected light and ~10 to 100 microns for studies of thermal emission), and cooled telescopes.
To explore the makeup of objects in the trans-neptunian region, COMPLEX recommends an approach that combines telescopic observations of the bulk properties of a large sample of Kuiper Belt objects with close-up, spacecraft studies of the detailed properties of a few specific objects.
While telescopes are showing us that trans-neptunian objects are relatively common and are providing information about their disk-averaged surface composition, spacecraft missions are necessary to explore the detailed nature of these icy bodies. /readingroom/books/neptune   (4739 words)

 Trans-Neptunian objects
The total volume of known TNOs is estimated at 66% of that of the Moon (half of this in the 6 largest objects).
With 14 confirmed or suspected binary TNOs (through July 2004) in a population of 995 objects, this suggests that binary TNOs are quite common.
Two objects, the SDO (87269) 2000 OO67 and the inner Oort cloud object (90377) Sedna, have aphelion distances near 1000 AU. /astro/tnos.html   (1038 words)

 Pluto as largest Trans-Neptunian Object (TNO) - Bad Astronomy and Universe Today Forum
Its orbit and its composition are very similar to the other Trans-Neptunian Objects (TNOs).
Objects which are thrown into the Solar System (such as comets) tend to have a separate category.
TNOs are as like the objects of the asteroid belt as they are planets. /showthread.php?t=317   (4273 words) -- Just Discovered: Minor Planet Brighter than All Others
The object has been classified as a Trans-Neptunian Object, or TNO -- a class of icy rocks that orbit the Sun out beyond Neptune's orbit.
The new object has been named 2000 WR106.
TNOs orbit the Sun at a distance of between 30 and 50 AU (1 AU, or astronomical unit, is the distance between the Sun and Earth). /scienceastronomy/solarsystem/new_planet_001204.html   (774 words)

 New Scientist SPACE - Breaking News - New world found in outer solar system
The object could be the biggest in the Kuiper belt of rocky objects that orbit the outer reaches of the solar system.
The first data made public about the object suggested the object could be up to twice the size of Pluto, but newly revealed observations indicate the object is about 70% Pluto's diameter.
Estimates of the object's brightness posted by the MPC on Friday at 0027 GMT suggested the object could be as large as twice Pluto's diameter if it was relatively non-reflective. /article.ns?id=dn7751   (835 words)

 <arttitle>Discovery of a Small Pluto
By combining the set of objects identified in both scan sequences and displaying their relative field positions on a computer monitor, possible TNOs appeared as pairs of objects aligned nearly parallel to the ecliptic, and separated by ~5 to 20 arcseconds (the expected displacement in 4 hours of a TNO observed near opposition).
We find that the object’s photometric properties are similar to those of fainter TNOs except for an unusual flattening of the reflectance spectrum near 0.8 microns.
We eliminated noise artifacts (mostly caused by the random appearance of faint cosmic ray hits) by requiring each object pair to have retrograde motion, and to appear consistently in the separate R and V images before co-addition. /www_info/astro/papers/eb173_paper_rev2.html   (1780 words)

 IAU / FAQ / Trans-Neptunian Object 2003 UB313
Until the report of this Working Group is received, all objects discovered at a distance greater than 40 AU will continue to be regarded as part of the Trans-Neptunian population.
IAU Circular 8577 announced on July 29, 2005 the discovery of three relatively bright Trans-Neptunian objects by M. Brown, C. Trujillo, and D. Rabinowitz using the Palomar 1.2-m Schmidt telescope.
The IAU notes the very rapid pace of discovery of bodies within the Solar system over the last decade, and so our understanding of the Trans-Neptunian Region is therefore still evolving very rapidly. /IAU/FAQ/2003_UB313.html   (297 words)

 RASNZ Occultation Section - Minor Planet News (December 2000)
Further observations of the object's position will be made in the coming weeks and months to improve knowledge of the orbital parameters and thereby the object's absolute magnitude, a parameter describing the object's brightness at a standard distance.
As of 2000 December 1, the MPC's orbit suggests that this object is 43 times farther from the Sun than the Earth is, and is presently 42 times farther from Earth than the Earth is from the Sun.
An object this far away takes nearly three centuries to circle the Sun, so astronomers will need to observe it over many weeks or months for its motion to betray the orbit's true character. /planet/news/news0012.htm   (2374 words)

 [8.07] The Collisional Evolution of the Trans-Neptunian Object Size Distribution
The HST survey of trans-Neptunian objects (TNOs) by Bernstein et al.~[1] detected two distinct populations, `classical' and `excited', and found a deficit of smaller (\lesssim100 km) TNOs relative to the power law found earlier for larger bodies.
Using the analytical model of O'Brien and Greenberg [2] and a numerical collisional evolution model [3] with reasonable strength parameters for icy bodies [4], we find that the TNO populations likely started with shallow initial size distributions, and that bodies \gtrsim10 km in diameter are likely not in a collisional steady state.
If the initial size distributions were steeper than the current size distributions, collisional erosion could not remove enough bodies over the age of the solar system to match the observations. /publications/baas/v36n4/dps2004/74.htm   (308 words)

 KnowledgeNews - Pluto
Pluto is tiny--only the 17th biggest object in the solar system--and its orbit is more like a comet’s than a planet’s.
As solar objects go, Pluto is very, very far away.
Those far less impressive classifications are given to the countless indiscriminate comets, asteroids, and other bits of celestial trivia circling the sun beyond the orbit of Neptune. /science/pluto.htm   (722 words) - A 10th planet? Maybe...
These objects (which appear to be basically large comets) lie in the Kuiper Belt— a ring of rocky ice balls (this painting shows one such object and the ring) that starts just outside of Neptune's orbit and extends beyond Pluto's orbit.
Jillions of Kuiper Belt objects orbit the Sun and we estimate at least 70,000 of these balls have diameters greater than 60 miles (100 km).
These largely icy objects stretch out beyond Neptune's orbit and culminate in a large, roughly spherical cloud of icy comets. /tech/columnist/aprilholladay/2005-08-04-holladay-tenth-planet_x.htm   (1268 words)

 physics - 90377 Sedna
Sedna has an estimated diameter of between 1180 and 1800 kilometres (730 to 1470 miles) and may be the largest object found in the solar system since Pluto was discovered in 1930.
Another object, 2000 CR, has an orbit similar to Sedna's but a bit less extreme: perihelion is 45 AU, aphelion is 415 AU, and the orbital period is 3420 years.
A search was thus made for a natural satellite, the most likely cause for such a long rotation, but investigation by the Hubble Space Telescope in March 2004 observed no such object orbiting the planetoid. /physics/90377_Sedna   (1058 words)

 Planetoid - - Asteroid, Trans-Neptunian object, Minor planet, 1 Ceres, ...
The term is again coming into use, but now meaning only the largest asteroids and trans-Neptunian objects like 1 Ceres, 50000 Quaoar or 90377 Sedna.
Planetoid, Asteroid, Trans-Neptunian object, Minor planet, 1 Ceres, Synonym...
Planetoid - - Asteroid, Trans-Neptunian object, Minor planet, 1 Ceres,... /Planetoid.html   (100 words)

 MAST Field from the Trans-Neptunian Object Search Project
The "TNO Search Field" images are the sidereally summed images of a search for trans-Neptunian objects (TNOs) using the Wide Field Camera of the HST/ACS instrument.
The TNO detection process requires the subtraction of all sidereally fixed sources (stars and galaxies) from each image, followed by summation and point-source detection along all candidate TNO orbits.
The TNO search consisted of approximately 96x400 s exposures in the F606W filter for each of six contiguous ACS fields of view. /prepds/tno   (305 words)

 A fuss over 'planet' The San Diego Union-Tribune
His suggestion: Every object of Pluto's size or larger should be considered a planet.
To be sure, Pluto and 2003 UB313 – the temporary designation for the object – share some characteristics that are distinctly unplanetlike.
Sure, he acknowledged, Pluto and the newly found object are relatively small. /uniontrib/20050808/news_1n8planet.html   (1006 words) News & Features Kansas City Strip Mike Brown's Body 2005-08-11
Brown and two colleagues found the object in January, but they wanted to keep it secret until an important September conference, the better to get lots of publicity when they made the claim that they'd found the solar system's tenth planet.
Forced to act or get scooped, Brown hastily called a press conference and announced on July 29 that his team had found the solar system's tenth planet, an object that may be half again as large as Pluto.
Let's retread Tombaugh as the discoverer of an entire class of objects (TNOs) and drink a toast to him when TNOs revolutionize our understanding of the formation of planetary systems," the irascible Ashman wrote in an e-mail. /issues/2005-08-11/news/strip.html?src=default_rss   (1469 words)

 New Pluto-Size Object Discovered in Solar System
The astronomers are classifying the newly discovered object as a "scattered Kuiper belt object." Such objects are believed to have had a close encounter with Neptune, which then scattered them with its gravitational force into eccentric orbits.
The object, designated 2003 EL61, is about 930 miles (1,500 kilometers) across, according to Mike Brown, an astronomer at the California Institute of Technology, who led the U.S-based team.
Designated 2003 EL61, the object is estimated to be about 930 miles (1,500 kilometers) across and is orbited by a moon. /news/2005/07/0729_050729_newworld.html   (516 words) -- Planet 10? Tiny 'Plutino' Almost Qualifies
The object, 2000 EB173, was found in March using data collected by a 39-inch (1-meter) telescope at the CIDA Observatory in Venezuela.
The object appears to be dark red, suggesting it is covered with ancient organic chemistry, Baltay said, but more data will reveal better facts.
It's a plutino -- an object that orbits the Sun in the same amount of time as Pluto, but is too small to be called a planet. /scienceastronomy/solarsystem/plutino_001024.html   (672 words)

 Trans-Neptunian Object Lightcurves
TNO R lightcurves data file from Sheppard and Jewitt 2002.
TNO R lightcurves data file from Hainaut et al.
TNO R lightcurves data file from Collander-Brown et al. /pds/tnolc.html   (144 words)

 List Of Transneptunian Objects
It is also updated as and when new objects are discovered.
This list is updated daily, except for the few days surrounding the preparation of each batch of MPCs. /iau/lists/TNOs.html   (50 words)

 trans-Neptunian object
A class of objects that includes Kuiper Belt objects and Scattered Disk objects. /encyclopedia/T/trans-Neptunian_object.html   (98 words)

 Encyclopedia of Astronomy and Astrophysics » Trans-Neptunian Object (TNO)
An outer Solar System object whose orbit has a semi-major axis greater than that of Neptune (30.1 AU).
The TNOs are often classified according to their orbital characteristic...
They are given asteroidal designations, though they are not asteroidal in nature, but most likely planetesimals that have remained unmodified since the early history of the Solar System. /10.1888/0333750888/5270   (81 words)

 [6.05] Multiplicity in the Kuiper Belt: The First Discovery of a Binary Trans-Neptunian Object
Currently, over 400 of these trans-Neptunian Objects (TNOs) are known, which one may also include Pluto and its moon Charon as not only the first TNOs discovered, but the first known binary TNO system.
Another reservoir of minor planets is the Kuiper belt, a large population of small bodies beyond Neptune that are believed to be the sources for short-period comets.
Due to the Kuiper belt's distance from Earth, it seemed unlikely that other binary TNOs could be discovered at the present. /publications/baas/v33n3/dps2001/557.htm   (326 words)

We also discovered a 700-km diameter Trans-Neptunian Object (TNO).
See the Near-Earth Object Confirmation Page (NEOCP) of the Minor Planet Center for ephemerides.
At both sites the NEAT cameras use 1.2-m (48") telescopes to find Near-Earth objects (NEOs), both Near-Earth asteroids (NEAs) and comets.   (196 words)

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