# Solar System by orbital radius

A selection of Solar System objects sorted by increasing orbital semimajor axis.  The orbital semimajor axis is approximately equal to the mean orbital radius.

## list

1. Star Sol: a = 0
2. Planet I Mercury: a = 5.79090365522286E10 m = (α + π)/2; α = 6.98168774620779E10 m = 0.466697 AU; π = 4.60011956423793E10 m = 0.307499 AU
3. Planet II Venus: a = 1.0820810422088355E11 m = (α + π)/2; α = 1.089391142160591E11 m = 0.728213 AU; π = 1.07477094225708E11 m = 0.718440 AU
4. Planet III Terra: a = 1.49598023E11 m = 149598023 km; α = 1.52097597E11 m = 152097597 km; π = 1.47098449E11 m = 2aα
1. Terran Satellite I Luna: a = 3.84399E8 m = 384399 km; αmax = 4.067E8 m = 406700 km; πmin = 3.564E8 m = 356400 km
5. Planet IV Mars: a = 2.27939366E11 m = 227939366 km; α = 2.49261E11 m = 249261000 km; π = 2.06617732E11 m = 2aα
6. Minor Planet 4 Vesta: a = 3.53276867636757E11 m = 2.36151 AU; α = 3.88165784530827847806E11 m = (1 + e)a; π = 3.18387950742686152194E11 m = 2aα
7. Minor Planet 1 Ceres: a = 4.14386101839E11 m = 2.77 AU; α = 4.62454889652324E11 m = (1 + e)a; π = 3.66317314025676E11 m = 2aα
8. Minor Planet 2 Pallas: a = 4.1452337284515432E11 m = 2.7709176 AU; α = 5.3111138764483673373456E11 m = (1 + e)a; π = 2.9793535804547190626544E11 m = 2aα
9. Minor Planet 704 Interamnia: a = 4.572E11 m = 457.2 Gm; α = 5.28E11 m = 528 Gm; π = 3.864E11 m = 2aα
10. Minor Planet 10 Hygiea: a = 4.70003598207846E11 m = 3.14178 AU; α = 5.337360861248299176E11 m = (1 + e)a; π = 4.062711102908620824E11 m = 2aα
11. Planet V Jupiter: a = 7.78479E11 m = (α + π)/2; α = 8.16363E11 m = 816.363E6 km; π = 7.40595E11 m = 740.595E6 km
1. Jovian Satellite I Io: a = 4.2000682568560066921953402098409E8 m = (α + π)/2; α = 4.217E8 m = 421700 km; π = 4.1831365137120133843906804196818E8 m = $\displaystyle{ \frac {-(e - 1)α} {e + 1} }$
2. Jovian Satellite II Europa: a = 6.70900E8 m = (α + π)/2; α = 6.76938E8 m = 676938 km; π = 6.64862E8 m = 664862 km
3. Jovian Satellite III Ganymede: a = 1.0704E9 m = (α + π)/2; α = 1.0716E9 m = 1071600 km; π = 1.0692E9 m = 1069200 km
4. Jovian Satellite IV Callisto: a = 1.8827E9 m = 1882700 km; α = 1.897E9 m = 1897000 km; π = 1.8684E9 m = 2aα
12. Planet VI Saturn: a = 1.433525E12 m = (α + π)/2; α = 1.51450E12 m = 1514.50E6 km; π = 1.35255E12 m = 1352.55E6 km
1. Saturnian Satellite III Tethys: a = 2.94619E8 m = 294619 km; α = 2.946484619E8 m = (1 + e)a; π = 2.945895381E8 m = 2aα
2. Saturnian Satellite IV Dione: a = 3.77396E8 m = 377396 km; α = 3.782262712E8 m = (1 + e)a; π = 3.765657288E8 m = 2aα
3. Saturnian Satellite V Rhea: a = 5.2704E8 m = 527040 km; α = 5.2756704E8 m = (1 + e)a; π = 5.2651296E8 m = 2aα
4. Saturnian Satellite VI Titan: a = 1.22187E9 m = (α + π)/2; α = 1.25706E9 m = 1257060 km; π = 1.18668E9 m = 1186680 km
5. Saturnian Satellite VIII Iapetus: a = 3.56082E9 m = 3560820 km; α = 3.659387770584E9 m = (1 + e)a; π = 3.462252229416E9 m = 2aα
13. Planet VII Uranus: a = 2.870972E12 m = 2.870972E9 km; α = 3.00639E12 m = 3.00639E9 km; π = 2.735554E12 m = 2aα
1. Uranian Satellite I Ariel: a = 1.909E8 m = 190900 km; α = 1.9112908E8 m = (1 + e)a; π = 1.9067092E8 m = 2aα
2. Uranian Satellite II Umbriel: a = 2.66E8 m = 266000 km; α = 2.670374E8 m = (1 + e)a; π = 2.649626E8 m = 2aα
3. Uranian Satellite III Titania: a = 4.3591E8 m = 435910 km; α = 4.36389501E8 m = (1 + e)a; π = 4.35430499E8 m = 2aα
4. Uranian Satellite IV Oberon: a = 5.8352E8 m = 583520 km; α = 5.84336928E8 m = (1 + e)a; π = 5.82703072E8 m = 2aα
14. Planet VIII Neptune: a = 4.498407971949E12 m = (α + π)/2; α = 4.537303418331E12 m = 30.33 AU; π = 4.459512525567E12 m = 29.81 AU
1. Neptunian Satellite I Triton: a = 3.54759E8 m = 354759 km; α = 3.54764676144E8 m = (1 + e)a; π = 3.54753323856E8 m = 2aα
15. Minor Planet 90482 Orcus: a = 5.86035E12 m = (α + π)/2; α = 7.1907E12 m = 7.1907 Tm; π = 4.5300E12 m = 4.5300 Tm
16. Minor Planet 134340 Pluto: a = 5.906375E12 m = (α + π)/2; α = 7.37593E12 m = 7.37593E9 km; π = 4.43682E12 m = 4.43682E9 km
1. Plutonian Satellite I Charon: a = (1.9595764E7 ± 8) m = (19595.764 ± 0.008) km; α = 1.9598918918004E7 m = (1 + e)a; π = 1.9592609081996E7 m = 2aα
17. Minor Planet 307261 (2002 MS4): a = 6.2440655251473E12 m = (α + π)/2; α = 7.1509278173307E12 m = 47.801 AU; π = 5.3372032329639E12 m = 35.677 AU
18. Minor Planet 120347 Salacia: a = 6.31056177867345E12 m = (α + π)/2; α = 6.981732625569E12 m = 46.670 AU; π = 5.6393909317779E12 m = 37.697 AU
19. Minor Planet 136108 Haumea: a = 6.45005E12 m = (α + π)/2; α = 7.7170E12 m = 7.7170 Tm; π = 5.1831E12 m = 5.1831 Tm
20. Minor Planet 50000 Quaoar: a = 6.5365293623658E12 m = (α + π)/2; α = 6.8049079424016E12 m = 45.488 AU; π = 6.26815078233E12 m = 41.900 AU
21. Minor Planet 136472 Makemake: a = 6.79625E12 m = (α + π)/2; α = 7.8922E12 m = 7.8922 Tm; π = 5.7003E12 m = 5.7003 Tm
22. Minor Planet 55565 (2002 AW197): a = 7.03730823453405E12 m = (α + π)/2; α = 7.9527724042827E12 m = 53.161 AU; π = 6.1218440647854E12 m = 40.922 AU
23. Minor Planet 532037 (2013 FY27): a = 8.7598E12 m = (α + π)/2; α = 1.22539E13 m = 12.2539 Tm; π = 5.2657E12 m = 5.2657 Tm
24. Minor Planet 225088 Gonggong: a = 1.00956E13 m = 10.0956 Tm; α = 1.51378E13 m = 15.1378 Tm; π = 5.0534E12 m = 2aα
25. Minor Planet 136199 Eris: a = 1.015213005477985E13 m = (α + π)/2; α = 1.4579E13 m = 14.579 Tm; π = 5.7252601095597E12 m = 38.271 AU
26. Minor Planet 90377 Sedna: a = 7.57855333072665E13 m = (α + π)/2; α = 1.401732048459E14 m = 937 AU; π = 1.1397861768633E13 m = 76.19 AU

## notes

• AU ≡ (1.495978707E11 ≡ 149597870700) m
• eVesta = 0.098758
• eCeres = 0.116
• ePallas = 0.2812580
• eHygiea = 0.1356
• eIo = 0.0040313019
• eTethys = 0.0001
• eDione = 0.0022
• eRhea = 0.001
• eIapetus = 0.0276812
• eAriel = 0.0012
• eUmbriel = 0.0039
• eTitania = 0.0011
• eOberon = 0.0014
• eTriton = 0.000016
• eCharon = 0.000161