(15874) 1996 TL66
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Discovery[1]
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| Discovered by | David C. Jewitt, Jane X. Luu, Jun Chen, C. A. Trujillo |
| Discovery date | October 9, 1996 |
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Designations
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| MPC designation | (15874) 1996 TL66 |
| Alternate name(s) | none |
| Minor planet category |
Scattered disc[2][3] |
| Epoch January 4, 2010 (JD 2455200.5) | |
| Aphelion | 132.87 AU (19,877 Gm) |
| Perihelion | 35.010 AU (5,237 Gm) |
| Semi-major axis | 83.944 AU (12,557 Gm) |
| Eccentricity | 0.58292 |
| Orbital period | 769.12 yr |
| Average orbital speed | 2.98 km/s |
| Mean anomaly | 4.0507° |
| Inclination | 23.965° |
| Longitude of ascending node | 217.74° |
| Argument of perihelion | 184.40° |
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Physical characteristics
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| Dimensions | ~575 ± 115 km[5] |
| Mass | ~2×1020? kg[6] (Mass and density assumed) |
| Mean density | 2.0? g/cm3 |
| Albedo | 0.035+0.02 −0.01[5] |
| Temperature | ~31 K |
| Apparent magnitude | 21[7] |
| Absolute magnitude (H) | 5.4[4] |
(15874) 1996 TL66 (also written (15874) 1996 TL66) is a trans-Neptunian object (TNO) that resides in the scattered disc. The Spitzer Space Telescope has estimated this object to be about 575 km in diameter,[5] which makes it a dwarf-planet candidate. It is not a detached object since its perihelion (closest approach to the Sun) is under the influence of Neptune.[3] Light-curve-amplitude analysis suggests it is a spheroid.[8] Tancredi presents "in the form of a decision tree, the set of questions to be considered in order to classify an object as an icy 'dwarf planet'." They find that 1996 TL66 is a very probable plutoid.[9] Mike Brown's automatically updated website lists it as a likely dwarf planet.[10]
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[edit] Discovery
Discovered in 1996 by David C. Jewitt et al., it was the first object to be categorized as a scattered-disk object (SDO), although (48639) 1995 TL8, discovered a year earlier, was later recognised as a scattered-disk object. It was one of the largest known trans-Neptunian objects at the time of the discovery. It came to perihelion in 2001.[4]
[edit] Orbit and size
1996 TL66 orbits the Sun with a semi-major axis of 83.9 AU,[4] but is currently only 35 AU from the Sun with an apparent magnitude of 21.[7] The Spitzer Space Telescope has estimated it to have a low albedo with a diameter of about 575 ± 115 km.[5] Any icy body with a diameter greater than 400 km is probably spherical.[11] Light-curve-amplitude analysis shows only small deviations, suggesting 1996 TL66 is a spheroid with small albedo spots and hence a dwarf planet.[8]
[edit] References
- ^ "MPEC 1997-B18: 1996 TL66". Minor Planet Center. 1997-01-30. http://www.minorplanetcenter.net/mpec/J97/J97B18.html. Retrieved 2011-07-05.
- ^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. Retrieved 2009-01-22.
- ^ a b Marc W. Buie (2006-07-30). "Orbit Fit and Astrometric record for 15874". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/15874.html. Retrieved 2009-01-22.
- ^ a b c d "JPL Small-Body Database Browser: 15874 (1996 TL66)". 2006-07-30 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=15874. Retrieved 2009-01-22.
- ^ a b c d John Stansberry, Will Grundy, Mike Brown, Dale Cruikshank, John Spencer, David Trilling, Jean-Luc Margot (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538 [astro-ph].
- ^ Using the 2007 Spitzer spherical radius of 287.5 km; volume of a sphere * an assumed density of 2 g/cm3 yields a mass (m=d*v) of 1.99×1020 kg
- ^ a b "AstDys (15874) 1996TL66 Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=15874. Retrieved 2010-02-10.
- ^ a b Tancredi, G., & Favre, S. (2008) Which are the dwarfs in the Solar System?. Depto. Astronomía, Fac. Ciencias, Montevideo, Uruguay; Observatorio Astronómico Los Molinos, MEC, Uruguay. Retrieved 10-08-2011
- ^ Tancredi, G. (2010). "Physical and dynamical characteristics of icy “dwarf planets” (plutoids)". Icy Bodies of the Solar System: Proceedings IAU Symposium No. 263, 2009. http://journals.cambridge.org/article_S1743921310001717.
- ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. http://www.gps.caltech.edu/~mbrown/dps.html. Retrieved 2012-01-17.
- ^ Mike Brown. "The Dwarf Planets". Archived from the original on 13 February 2010. http://web.archive.org/web/20100213092604/http://web.gps.caltech.edu/~mbrown/dwarfplanets/. Retrieved 2010-02-09.
[edit] External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 1996 TL66: A New Type of Transneptunian Object – MPC news release
- 1996 TL66, a Newly Discovered Planetesimal
- 1996 TL66 – A New Dynamical Class in the Outer Solar System – from David Jewitt's Kuiper Belt website
- Lists and Plots: Minor Planets
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