(84522) 2002 TC302
|Discovered by||M. E. Brown,
C. A. Trujillo,
D. L. Rabinowitz(?)
|Discovery date||9 October 2002|
|MPC designation||(84522) 2002 TC302|
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 3|
|Observation arc||5574 days (15.26 yr)|
|Aphelion||71.552 AU (10.7040 Tm)|
|Perihelion||38.979 AU (5.8312 Tm)|
|55.265 AU (8.2675 Tm)|
|410.86 yr (150065 d)|
Average orbital speed
|0° 0m 8.636s / day|
|Earth MOID||38.1784 AU (5.71141 Tm)|
|Jupiter MOID||34.8125 AU (5.20788 Tm)|
|5.41 h (0.225 d)|
(84522) 2002 TC302 has an absolute magnitude (H) of 3.78. It has an estimated diameter of +105.6
−88.0 km. 584.1 Using the Spitzer Space Telescope, it was previously estimated to have a diameter of +337
−325 km, 1145 which would have made it one of the largest possible dwarf planets. This overestimation was due to insufficient motion to allow for a good sky subtraction and because it was very close to a brighter background object. Brown noted that the Spitzer measurement involved a very large potential error and that the object would likely be smaller, making its chances of it being a dwarf planet "likely" rather than "near certainty", in his opinion.
It was predicted that on 30 November 2013, (84522) 2002 TC302 might occult a star for slightly less than a minute. However, the possibility to observe this occultation was judged as small. The precise duration that a Solar System object occults a star provides a precise way to determine its diameter, if observed from multiple locations.
The red spectra suggests that (84522) 2002 TC302 has very little fresh ice on its surface.
Its rotational period is most likely 5.41 h, and it has a light-curve amplitude of ±0.01 mag. 0.04
(84522) 2002 TC302 will come to perihelion in 2058. Its perihelion (minimum distance from the Sun) of 39.1 AU is about the same as Pluto's semi-major axis (average distance from the Sun). It is classified as a scattered disc object.
Both the Minor Planet Center (MPC) and the Deep Ecliptic Survey (DES) show this probable dwarf planet to be in a 2:5 resonance with Neptune. Due to the resonance, it completes two orbits for every five orbits of Neptune.
As of 2009, it is the largest likely dwarf planet that is known to be in a non-plutino resonance with Neptune. Plutinos are objects in 2:3 mean-motion resonance with Neptune. For every two orbits that a plutino makes, Neptune makes three.
A still frame showing the motion of (84522) 2002 TC302 relative to Neptune being held stationary
The 2:5 resonance motion of (84522) 2002 TC302 (red) and the 2:3 resonance of Pluto (grey). Neptune is held stationary.
It has been observed 76 times over nine years.
- Marsden, Brian G. (2002-11-07). "MPEC 2002-V26 : 2002 TC302". IAU Minor Planet Center. Harvard-Smithsonian Center for Astrophysics. Retrieved 2010-01-06.
- "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2008-09-19.
- Marc W. Buie (2007-09-16). "Orbit Fit and Astrometric record for 84522". SwRI (Space Science Department). Retrieved 2008-09-19.
- "MPEC 2009-C70 :Distant Minor Planets (2009 FEB. 28.0 TT)". Minor Planet Center. 2009-02-10. Retrieved 2009-03-05.
- "JPL Small-Body Database Browser: 84522 (2002 TC302)" (last observation:2009-10-25). Retrieved 7 April 2016.
- S. Fornasier, E. Lellouch, T. Müller, P. Santos-Sanz, P. Panuzzo, C. Kiss, T. Lim, M. Mommert, D. Bockelée-Morvan, E. Vilenius, J. Stansberry, G.P. Tozzi, S. Mottola, A. Delsanti, J. Crovisier, R. Duffard, F. Henry, P. Lacerda, A. Barucci, & A. Gicquel (2013). TNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of 9 bright targets at 70–500 µm.
- Short-term variability of 10 trans-Neptunian objects
- Tegler, Stephen C. (2006-01-26). "Kuiper Belt Object Magnitudes and Surface Colors". Retrieved 2006-11-05.
- "(84522) 2002 TC302". Minor Planet Center. 2010-07-23. Retrieved 2010-10-24.
- John Stansberry; Will Grundy; Mike Brown; Dale Cruikshank; John Spencer; David Trilling; et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv: [astro-ph].
- Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 31 August 2016.
- Stevge Preston's Asteroid Occultation Updates item; accessed 22 February 2013
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