Planetang unano

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Tumalon sa: nabigasyon, hanapin
Paglalarawan ng mga kulay, albedo, at laki ng mga planetang unano

Ang planetang unano (Ingles: dwarf planet, Kastila: planeta enano) ayon sa International Astronomical Union (IAU), ay isang bagay sa kalangitan na umiikot palibot sa Araw na may sapat na bigat upang maging mabilog na dulot ng sariling balani ngunit hindi nalinis ang kalapit na rehiyon nito ng mga planetesimal at hindi isang satelayt.

Kasalukuyang miyembro[baguhin]

Mga katangiang orbital ng mga planeta unano[1]
Pangalan Rehiyon ng
Sistemang Solar
Laki ng
orbital (AU)
Tagal ng rebolusyon
(years)
Mean orbital
speed (km/s)
Inclination
to ecliptic
(°)
Orbital
eccentricity
Planetary
discriminant
Ceres Sinturong asteroyd 2.77 4.60 17.882 10.59 0.080 0.33
Pluto Kuiper belt 39.48 248.09 4.666 17.14 0.249 0.077
Haumea Kuiper belt 43.34 285.4 4.484 28.19 0.189  ?
Makemake Kuiper belt 45.79 309.9 4.419 28.96 0.159  ?
Eris Scattered disc 67.67 557 3.436 44.19 0.442 0.10
Mga katangiang pisikal ng mga planeta unano
Pangalan Diyametrong
Ekwitoryal
na malapit
sa Moon
Diyametrong
Ekwatoryal
(km)
Bigat
na malapit
sa Buwan
Bigat
(×1021 kg)
Densidad
(g/cm3)
Harapang
grabidad
(m/s2)
Belosidad
ng pagtakas

(km/s)
Inklanasyong
Aksiyal
Tagal ng
pag-ikot

(days)
Buwan Pang-ibabaw na
Temperatura
(K)
Atmospera
Ceres[2][3] 28% 974.6±3.2 1.3% 0.95 2.08 0.27 0.51 ~3° 0.38 0 167 wala
Pluto[4][5] 69% 2306±10 17.8% 13.05 2.0 0.58 1.2 119.59° -6.39 3 44 transient
Haumea[6][7] 33% 1150+250−100 5.7% 4.2 ± 0.1 2.6–3.3 ~0.44 ~0.84 2 32 ± 3  ?
Makemake[6][8] 43% 1500+400−200 ~5%? ~4? ~2? ~0.5 ~0.8 0 ~30 transient?
Eris[6][9] 75% <2340 22.7% 16.7 2.3 ~0.8 1.3 ~0.3 1 42 pansamantala?

Talababa[baguhin]

  1. Bowell, Ted. "The Asteroid Orbital Elements Database". Lowell Observatory. ftp://ftp.lowell.edu/pub/elgb/astorb.html. Hinango noong 2008-02-12. 
  2. Thomas, P.C; Parker J.Wm.; McFadden, L.A.; et al. (2005). "Differentiation of the asteroid Ceres as revealed by its shape". Nature 437 (7056): 224–26. Bibcode 2005Natur.437..224T. doi:10.1038/nature03938. PMID 16148926. 
  3. Calculated based on the known parameters. APmag and AngSize generated with Horizons (Ephemeris: Observer Table: Quantities = 9,13,20,29)
  4. Williams, D.R. (2006-09-07). "Pluto Fact Sheet". NASA. http://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html. Hinango noong 2007-03-24. 
  5. Buie, M. W.; Grundy, W.M.; Young, E.F.; Young, L.A.; Stern, S.A. (2006). "Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2". Astronomical Journal 132: 290. doi:10.1086/504422. arXiv:astro-ph/0512491. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006AJ....132..290B&db_key=AST&data_type=HTML&format=&high=444b66a47d27727. 
  6. 6.0 6.1 6.2 Stansberry, J.; Grundy, W.; Brown, M.; et al. (2007) (abstract). Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope. The Journal of Business. arXiv:astro-ph/0702538. 
  7. Rabinowitz, David L.; Barkume, K.M.; Brown, E.M. et al. (2006). "Photometric Observations Constraining the Size, Shape, and Albedo of 2003 EL61, a Rapidly Rotating, Pluto-Sized Object in the Kuiper Belt". The Astrophysical Journal 639 (2): 1238–1251. doi:10.1086/499575. arXiv:astro-ph/0509401. 
  8. J. Licandro, N. Pinilla-Alonso, M. Pedani, et al. (2006). "The methane ice rich surface of large TNO 2005 FY9: a Pluto-twin in the trans-neptunian belt?". Astronomy and Astrophysics 445 (L35-L38): L35. doi:10.1051/0004-6361:200500219. http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361:200500219. Hinango noong 2008-07-14. 
  9. Brown, Michael E.; Schaller, Emily L. (2007). "The Mass of Dwarf Planet Eris". Science 316 (5831): 1585. doi:10.1126/science.1139415. PMID 17569855. http://www.sciencemag.org/content/316/5831/1585. 


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