Ang planetang unano (Kastila: planeta enano, Ingles: dwarf planet) 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.

Paglalarawan ng mga kulay, albedo, at laki ng mga planetang unano

Kasalukuyang miyembro

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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. Nakuha noong 2008-02-12.{{cite web}}: CS1 maint: date auto-translated (link)[patay na link]
  2. Thomas, P.C; Parker J.Wm.; McFadden, L.A.; atbp. (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. {{cite journal}}: |access-date= requires |url= (tulong); Explicit use of et al. in: |author2= (tulong)CS1 maint: date auto-translated (link) CS1 maint: multiple names: mga may-akda (link)
  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. Nakuha noong 2007-03-24.{{cite web}}: CS1 maint: date auto-translated (link)
  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.{{cite journal}}: CS1 maint: date auto-translated (link) CS1 maint: multiple names: mga may-akda (link)
  6. 6.0 6.1 6.2 Stansberry, J.; Grundy, W.; Brown, M.; atbp. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope" (abstract). The Journal of Business. arXiv:astro-ph/0702538. {{cite journal}}: Cite journal requires |journal= (tulong); |format= requires |url= (tulong); Explicit use of et al. in: |author2= (tulong)CS1 maint: date auto-translated (link) CS1 maint: multiple names: mga may-akda (link)
  7. Rabinowitz, David L.; Barkume, K.M.; Brown, E.M.; atbp. (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. {{cite journal}}: Explicit use of et al. in: |author2= (tulong)CS1 maint: date auto-translated (link) CS1 maint: multiple names: mga may-akda (link)
  8. J. Licandro, N. Pinilla-Alonso, M. Pedani; atbp. (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. Nakuha noong 2008-07-14. {{cite journal}}: Explicit use of et al. in: |author= (tulong)CS1 maint: date auto-translated (link) CS1 maint: multiple names: mga may-akda (link)
  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.{{cite journal}}: CS1 maint: date auto-translated (link)

Mga kawing panlabas

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