List of gravitationally rounded objects of the Solar System

This is a list of gravitationally rounded objects of the Solar System, which are objects that have a rounded, ellipsoidal shape due to the forces of their own gravity (hydrostatic equilibrium). Their sizes range from dwarf planets and moons to the planets and the Sun. This list does not include any small Solar System bodies, but it does include a sample of planetary-mass objects whose shape has yet to be accurately determined. The Sun's orbital characteristics are listed in relation to the Galactic Center, while all other objects are listed in order of their distance from the Sun.

Sun

The Sun is a G-type main-sequence star. It contains almost 99.9 percent of all the mass in the Solar System.[1]

Sun[2]
Astronomical symbol[q]
Mean distance
from the Galactic Center		 km
light years		 ~2.5×1017
~26,000
Mean radius km
 :E[f]		 696,342
109.3
Surface area km2
 :E[f]		 6.0877×1012
11,990
Volume km3
 :E[f]		 1.4122×1018
1,300,000
Mass kg
 :E[f]		 1.9855×1030
332,978.9
Gravitational parameter m3/s2 1.327×1020
Density g/cm3 1.409
Equatorial gravity m/s2 274.0
Escape velocity km/s 617.7
Rotation period days[g] 25.38
Orbital period about Galactic Center[3] million years 225–250
Mean orbital speed[3] km/s ~220
Axial tilt[i] to the ecliptic deg. 7.25
Axial tilt[i] to the galactic plane deg. 67.23
Mean surface temperature K 5,778
Mean coronal temperature[4] K 1–2×106
Photospheric composition H, He, O, C, Fe, S

Planets

Key
*
Terrestrial planet		 °
Gas giant		 †
Ice giant

A planet is defined according to the 2006 International Astronomical Union (IAU) definition as a body in orbit around the Sun that was large enough to have achieved hydrostatic equilibrium and to have cleared the neighbourhood around its orbit.[5] The practical meaning of "cleared the neighborhood" is that a planet is comparatively massive enough for its gravitation to control the orbits of all objects in its vicinity. By the IAU's definition, there are eight planets in the Solar System; four terrestrial planets (Mercury, Venus, Earth and Mars) and four giant planets, which can be divided further into two gas giants (Jupiter and Saturn) and two ice giants (Uranus and Neptune). When excluding the Sun, the four giant planets account for more than 99 percent of the mass of the Solar System.

  *Mercury[6] *Venus[7] *Earth[8] *Mars[9] °Jupiter[10] °Saturn[11] †Uranus[12] †Neptune[13]
 
Astronomical symbol[q]
Mean distance
from the Sun		 km
AU		 57,909,175
0.38709893		 108,208,930
0.72333199		 149,597,890
1.00000011		 227,936,640
1.52366231		 778,412,010
5.20336301		 1,426,725,400
9.53707032		 2,870,972,200
19.19126393		 4,498,252,900
30.06896348
Equatorial radius km
 :E[f]		 2,439.64
0.3825		 6,051.59
0.9488		 6,378.1
1		 3,397.00
0.53260		 71,492.68
11.209		 60,267.14
9.449		 25,557.25
4.007		 24,766.36
3.883
Surface area km2
 :E[f]		 75,000,000
0.1471		 460,000,000
0.9020		 510,000,000
1		 140,000,000
0.2745		 64,000,000,000
125.5		 44,000,000,000
86.27		 8,100,000,000
15.88		 7,700,000,000
15.10
Volume km3
 :E[f]		 6.083×1010
0.056		 9.28×1011
0.857		 1.083×1012
1		 1.6318×1011
0.151		 1.431×1015
1,321.3		 8.27×1014
763.62		 6.834×1013
63.102		 6.254×1013
57.747
Mass kg
 :E[f]		 3.302×1023
0.055		 4.8690×1024
0.815		 5.972×1024
1		 6.4191×1023
0.107		 1.8987×1027
318		 5.6851×1026
95		 8.6849×1025
14.5		 1.0244×1026
17
Gravitational parameter m3/s2 2.203×1013 3.249×1014 3.986×1014 4.283×1013 1.267×1017 3.793×1016 5.794×1015 6.837×1015
Density g/cm3 5.43 5.24 5.52 3.940 1.33 0.70 1.30 1.76
Equatorial gravity m/s2 3.70 8.87 9.81 3.71 23.12 10.44 8.69 11.00
Escape velocity km/s 4.25 10.36 11.18 5.02 59.54 35.49 21.29 23.71
Rotation period[g] days 58.646225 243.0187 0.99726968 1.02595675 0.41354 0.44401 0.71833 0.67125
Orbital period[g] years 0.2408467 0.61519726 1.0000174 1.8808476 11.862615 29.447498 84.016846 164.79132
Mean orbital speed km/s 47.8725 35.0214 29.7859 24.1309 13.0697 9.6724 6.8352 5.4778
Eccentricity 0.20563069 0.00677323 0.01671022 0.09341233 0.04839266 0.05415060 0.04716771 0.00858587
Inclination[f] deg. 7.00 3.39 0[8] 1.85 1.31 2.48 0.76 1.77
Axial tilt[i] deg. 0.0 177.3[h] 23.44 25.19 3.12 26.73 97.86[h] 29.58
Mean surface temperature K 440–100 730 287 227 152 [j] 134 [j] 76 [j] 73 [j]
Mean air temperature[k] K 288 165 135 76 73
Atmospheric composition He,  Na+
P+ 		 CO2, N2, SO2 N2, O2, Ar, CO2 CO2, N2
Ar		 H2, He H2, He H2, He
CH4		 H2, He
CH4
Number of known moons[v] 0 0 1 2 79 62 27 14
Rings? No No No No Yes Yes Yes Yes
Planetary discriminant[l][o] 9.1×104 1.35×106 1.7×106 1.8×105 6.25×105 1.9×105 2.9×104 2.4×104

Dwarf planets

Key
†
asteroid		 ‡
plutoid

The IAU, the internationally recognized authority for assigning designations to celestial bodies, defines dwarf planets as bodies that are large enough to have achieved hydrostatic equilibrium, but have not cleared their neighbourhoods of similar objects. Since 2008, there have been five dwarf planets recognized by the IAU. Ceres orbits in the asteroid belt, between the orbits of Mars and Jupiter. The others orbit beyond Neptune and are subclassified as plutoids.

†Ceres[14] ‡Pluto[15] ‡Haumea[16] ‡Makemake[17] ‡Eris[18]
Astronomical symbol[q]
Minor planet number 1 134340 136108 136472 136199
Mean distance
from the Sun		 km
AU		 413,700,000
2.766		 5,906,380,000
39.482		 6,484,000,000
43.335		 6,850,000,000
45.792		 10,210,000,000
67.668
Mean radius km
 :E[f]		 473
0.0742		 1,190[19]
0.186		 816 (1161×852×569)
0.13[20][21]		 715±7
0.11[22]		 1,163
0.18[23]
Volume km3
 :E[f]		 4.21×108
0.00039[b]		 6.99×109
0.0065		 1.5×109
0.001		 1.5×109
0.001[b]		 6.59×109
0.0061[b]
Surface area km2
 :E[f]		 2,770,000
0.0054[a]		 17,700,000
0.035		 6,800,000
0.0133[z]		 6,400,000
0.013[a]		 17,000,000
0.0333[a]
Mass kg
 :E[f]		 9.39×1020
0.00016		 1.305×1022
0.0022		 4.01 ± 0.04×1021
0.0007[24]		 < 4.4 ×1021

< 0.0007

 1.7×1022
0.0028[25]
Gravitational parameter m3/s2 6.263 × 1010 8.710 × 1011 2.674 × 1011 < 2.9366 × 1011 1.108 × 1012
Density g/cm3 2.16 1.87 2.6[20] < 2.933 2.25[c]
Equatorial gravity m/s2 0.27[d] 0.62 0.63[d] < 0.57 ~0.8[d]
Escape velocity km/s[e] 0.51 1.21 0.91 < 0.91 1.37
Rotation period[g] days 0.3781 6.38723 0.167 0.3238 1.0792
Orbital period[g] years 4.599 247.92065 285.4 309.9 557
Mean orbital speed km/s 17.882 4.7490 4.484[o] 4.4[o] 3.436[n]
Eccentricity 0.080 0.24880766 0.18874 0.159 0.44177
Inclination[f] deg. 10.587 17.14175 28.19 28.96 44.187
Axial tilt[i] deg. 4 119.59[h] ? ? ?
Mean surface temperature[w] K 167[26] 40[27] <50[28] 30 30
Atmospheric composition H2O N2, CH4, CO ? N2, CH4[29] N2, CH4[30]
Number of known moons[v] 0 5 2[31] 1[32] 1[33]
Planetary discriminant[l][o] 0.33 0.077 0.023 0.02 0.10

Most-likely additional dwarf planets

These trans-Neptunian objects are theoretically large enough to be dwarf planets. Dozens more could have been included.[34] Both Quaoar and Orcus have known moons that have allowed the mass of the systems to be determined. Both are more massive than the 5×1020 kg recommendation of the IAU 2006 draft proposal as sufficient for classification as a dwarf planet.[35]

Orcus[36] Ixion[37] 2002 MS4[38] Salacia[39] Varuna[40] 2005 UQ513[41] Quaoar[42] 2007 OR10[43] 2007 UK126[44] Sedna[45]
Minor-planet number 90482 28978 307261 120347 20000 202421 50000 225088 229762 90377
Semi-major axis km
AU		 5,896,946,000
39.419		 5,935,999,000
39.68		 6,273,000,000
41.93		 6,311,000,000
42.19		 6,451,398,000
43.13		 6,479,089,380
43.31		 6,493,296,000
43.6		 10,072,433,340
67.33		 11,032,000,000
73.74		 78,668,000,000
525.86
Mean radius[s] km
 :E[f]		 473
0.0742		 402
0.063		 467[46]
0.073		 427[47]
0.067		 ~350
0.055		 460
0.072[aa]		 422
0.066		 ~640
0.10		 440
0.07[aa]		 ~500
0.08
Surface area[a] km2
 :E[f]		 2,811,000
0.0055		 2,031,000
0.00398		 2,741,000
0.00537		 2,291,000
0.00449		 1,091,000
0.00214		 2,659,000
0.0052		 2,238,000
0.00439		 6,160,000
0.012		 2,430,000
0.005		 3,000,000
0.006
Volume[b] km3
 :E[f]		 443,000,000
0.0004		 272,000,000
0.0003		 427,000,000
0.0004		 327,000,000
0.0003		 549,000,000
0.0005		 408,000,000
0.0004		 315,000,000
0.0003		 1,440,000,000
0.001		 360,000,000
0.0003		 500,000,000
0.0005
Mass[t] kg
 :E[f]		 6.32×1020[48]
0.0001		 ? ? 4.5×1020[49]
0.000075		 5.5×1020
0.00009		 ? (1.3–1.9)×1021[50]
0.0003		 1.75×1021

0.0003

 ? ?
Density[t] g/cm3 1.5±0.3[48] ? ? 1.16[49] 0.9992[51] ? >2.8[50] 1.76 ? ?
Equatorial gravity[d] m/s2 0.27 ? ? 0.11 0.14 ? 0.24 0.285 ? ?
Escape velocity[e] km/s 0.50 ? ? 0.43 0.38 ? 0.45 0.604 ? ?
Rotation period[g] days 0.5495 0.51667 ? 0.25 0.13216[51] 0.29292 0.7366 1.86708 0.46 0.42[52]
Orbital period[g] years 247.492 249.95 271.53 274.03 283.20 285.12 287.97 552.52 633.28 12,059.06
Mean orbital speed km/s 4.68 4.66 4.58 4.58 4.53 4.52 4.52 3.63 3.25 1.04
Eccentricity 0.22552 0.242 0.148 0.10312 0.051 0.145 0.038 0.5 0.490 0.855
Inclination[f] deg. 22.5 19.6 17.693 23.9396 17.2 25.69 8 30.7 23.37 11.93
Mean surface temperature[w] K ~42 ~43 ~43 ? ~43 ~41 ~41 ~30 ~32 ~12
Number of known moons 1[53] 0 0 1 0 0 1[54] 1 1[55] 0
Planetary discriminant[l][o] 0.003 0.0027 <0.1 <0.1 0.0027 0.003 0.0015 <0.1 0.036[x] ?[x]
Absolute magnitude (H) 2.30 3.20 3.7 4.2 3.70 3.40 2.71 1.7 3.40 1.58

Satellites

Key
🜨
Satellite of Earth		 ♃
Satellite of Jupiter		 ♄
Satellite of Saturn		 ⛢
Satellite of Uranus		 ♆
Satellite of Neptune		 ♇
Satellite of Pluto

There are 19 natural satellites in the Solar System that are known to be massive enough to be close to hydrostatic equilibrium. Alan Stern calls these satellite planets, although the term major moon is more common.

Several of these were once in equilibrium but are no longer: these include all of the moons listed for Saturn apart from Titan and Rhea. Other moons that were once in equilibrium but are no longer very round, such as Saturn's Phoebe, are not included. Satellites are listed first in order from the Sun, and second in order from their parent body.

🜨Moon[56] ♃Io[57] ♃Europa[58] ♃Ganymede[59] ♃Callisto[60] ♄Mimas[p] ♄Enceladus[p] ♄Tethys[p] ♄Dione[p] ♄Rhea[p]
Astronomical symbol[q]
Mean distance
from primary:		 km 384,399 421,600 670,900 1,070,400 1,882,700 185,520 237,948 294,619 377,396 527,108
Mean radius km
 :E[f]		 1,737.1
0.272		 1,815
0.285		 1,569
0.246		 2,634.1
0.413		 2,410.3
0.378		 198.30
0.031		 252.1
0.04		 533
0.084		 561.7
0.088		 764.3
0.12
Surface area[a] km2
 :E[f]		 37,930,000
0.074		 41,910,000
0.082		 30,900,000
0.061		 87,000,000
0.171		 73,000,000
0.143		 490,000
0.001		 799,000
0.0016		 3,570,000
0.007		 3,965,000
0.0078		 7,337,000
0.0144
Volume[b] km3
 :E[f]		 2.2×1010
0.02		 2.53×1010
0.02		 1.59×1010
0.015		 7.6×1010
0.07		 5.9×1010
0.05		 3.3×107
0.00003		 6.7×107
0.00006		 6.3×108
0.0006		 7.4×108
0.0007		 1.9 ×109
0.0018
Mass kg
 :E[f]		 7.3477×1022
0.0123		 8.94×1022
0.015		 4.80×1022
0.008		 1.4819×1023
0.025		 1.0758×1023
0.018		 3.75×1019
0.000006		 1.08×1020
0.000018		 6.174×1020
0.00010		 1.095×1021
0.00018		 2.306×1021
0.0004
Density[c] g/cm3 3.3464 3.528 3.01 1.936 1.83 1.15 1.61 0.98 1.48 1.23
Equatorial gravity[d] m/s2 1.622 1.796 1.314 1.428 1.235 0.0636 0.111 0.145 0.231 0.264
Escape velocity[e] km/s 2.38 2.56 2.025 2.741 2.440 0.159 0.239 0.393 0.510 0.635
Rotation period days[g] 27.321582
(sync)[m]		 1.7691378
(sync)		 3.551181
(sync)		 7.154553
(sync)		 16.68902
(sync)		 0.942422
(sync)		 1.370218
(sync)		 1.887802
(sync)		 2.736915
(sync)		 4.518212
(sync)
Orbital period about primary days[g] 27.32158 1.769138 3.551181 7.154553 16.68902 0.942422 1.370218 1.887802 2.736915 4.518212
Mean orbital speed[o] km/s 1.022 17.34 13.740 10.880 8.204 14.32 12.63 11.35 10.03 8.48
Eccentricity 0.0549 0.0041 0.009 0.0013 0.0074 0.0202 0.0047 0.02 0.002 0.001
Inclination to primary's equator deg. 18.29–28.58 0.04 0.47 1.85 0.2 1.51 0.02 1.51 0.019 0.345
Axial tilt[i][u] deg. 6.68 0 0 0–0.33[61] 0 0 0 0 0 0
Mean surface temperature[w] K 220 130 102 110[62] 134 64 75 64 87 76
Atmospheric composition Ar, He
Na, K, H		 SO2[63] O2[64] O2[65] O2, CO2[66] H2O, N2
CO2, CH4[67]
Rings? No No No No No No No No No Yes?
♄Titan[p] ♄Iapetus[p] ⛢Miranda[r] ⛢Ariel[r] ⛢Umbriel[r] ⛢Titania[r] ⛢Oberon[r] ♆Triton[68] ♇Charon[15]
Mean distance
from primary:		 km 1,221,870 3,560,820 129,390 190,900 266,000 436,300 583,519 354,759 17,536
Mean radius km
 :E[f]		 2,576
0.404		 735.60
0.115		 235.8
0.037		 578.9
0.091		 584.7
0.092		 788.9
0.124		 761.4
0.119		 1353.4
0.212		 603.5
0.095
Surface area[a] km2
 :E[f]		 83,000,000
0.163		 6,700,000
0.013		 700,000
0.0014		 4,211,300
0.008		 4,296,000
0.008		 7,820,000
0.015		 7,285,000
0.014		 23,018,000
0.045		 4,580,000
0.009
Volume[b] km3
 :E[f]		 7.16×1010
0.066		 1.67×109
0.0015		 5.5×107
0.00005		 8.1×108
0.0007		 8.4×108
0.0008		 2.06×109
0.0019		 1.85×109
0.0017		 1×1010
0.00923		 9.2×108
0.00085
Mass kg
 :E[f]		 1.3452×1023
0.023		 1.8053×1021
0.0003		 6.59×1019
0.00001		 1.35×1021
0.00023		 1.2×1021
0.0002		 3.5×1021
0.0006		 3.014×1021
0.00051		 2.14×1022
0.00358		 1.52×1021
0.00025
Density[c] g/cm3 1.88 1.08 1.20 1.67 1.40 1.72 1.63 2.061 1.65
Equatorial gravity[d] m/s2 1.35 0.22 0.08 0.27 0.23 0.39 0.35 0.78 0.28
Escape velocity[e] km/s 2.64 0.57 0.19 0.56 0.52 0.77 0.73 1.46 0.58
Rotation period days[g] 15.945
(sync)[m]		 79.322
(sync)		 1.414
(sync)		 2.52
(sync)		 4.144
(sync)		 8.706
(sync)		 13.46
(sync)		 5.877
(sync)		 6.387
(sync)
Orbital period about primary days 15.945 79.322 1.4135 2.520 4.144 8.706 13.46 5.877 6.387
Mean orbital speed[o] km/s 5.57 3.265 6.657 5.50898 4.66797 3.644 3.152 4.39 0.2
Eccentricity 0.0288 0.0286 0.0013 0.0012 0.005 0.0011 0.0014 0.00002 0.0022
Inclination to primary's equator deg. 0.33 14.72 4.22 0.31 0.36 0.14 0.10 157[h] 0.001
Axial tilt[i][u] deg. 0 0 0 0 0 0 0 0 ?
Mean surface temperature[w] K 93.7[69] 130 59 58 61 60 61 38[70] 53
Atmospheric composition N2, CH4[71] N2, CH4[72]

Notes

Unless otherwise cited:[ac]

  1. ^ The planetary discriminant for the planets is taken from material published by Stephen Soter.[73] Planetary discriminants for Ceres, Pluto and Eris taken from Soter, 2006. Planetary discriminants of all other bodies calculated from the Kuiper belt mass estimate given by Lorenzo Iorio.[74]
  2. ^ Saturn satellite info taken from NASA Saturnian Satellite Fact Sheet.[75]
  3. ^ Astronomical symbols for all listed objects except Ceres taken from NASA Solar System Exploration.[76] Symbol for Ceres was taken from material published by James L. Hilton.[77] The Moon is the only natural satellite with an astronomical symbol, and Pluto and Ceres the only dwarf planets.
  4. ^ Uranus satellite info taken from NASA Uranian Satellite Fact Sheet.[78]
  5. ^ Radii for plutoid candidates taken from material published by John A. Stansberry et al.[23]
  6. ^ Axial tilts for most satellites assumed to be zero in accordance with the Explanatory Supplement to the Astronomical Almanac: "In the absence of other information, the axis of rotation is assumed to be normal to the mean orbital plane."[79]
  7. ^ Natural satellite numbers taken from material published by Scott S. Sheppard.[80]

Manual calculations (unless otherwise cited)

  1. ^ Surface area A derived from the radius using , assuming sphericity.
  2. ^ Volume V derived from the radius using , assuming sphericity.
  3. ^ Density derived from the mass divided by the volume.
  4. ^ Surface gravity derived from the mass m, the gravitational constant G and the radius r: G*m/r2 .
  5. ^ Escape velocity derived from the mass m, the gravitational constant G and the radius r: sqrt((2*G*m)/r) .
  6. ^ Orbital speed is calculated using the mean orbital radius and the orbital period, assuming a circular orbit.
  7. ^ Assuming a density of 2.0
  8. ^ Calculated using the formula where Teff =54.8 K at 52 AU, is the geometric albedo, q=0.8 is the phase integral, and is the distance from the Sun in AU. This formula is a simplified version of that in section 2.2 of Stansberry et al., 2007,[23] where emissivity and beaming parameter were assumed equal unity, and was replaced with 4 accounting for the difference between circle and sphere. All parameters mentioned above were taken from the same paper.
  9. ^ Calculated using the formula , where H is the absolute magnitude, p is the geometric albedo and D is the diameter in km, and assuming an albedo of 0.15, as per Dan Bruton.[81]
  10. ^ Mass derived from the density multipied by the volume.

Individual calculations

  1. ^ Derived from density
  2. ^ Surface area was calculated using the formula for a scalene ellipsoid:
    where is the modular angle, or angular eccentricity; and , are the incomplete elliptic integrals of the first and second kind, respectively. The values 980 km, 759 km, and 498 km were used for a, b, and c respectively.

Other notes

  1. ^ Relative to Earth
  2. ^ Sidereal
  3. ^ Retrograde
  4. ^ The inclination of the body's equator from its orbit.
  5. ^ At pressure of 1 bar
  6. ^ At sea level
  7. ^ The ratio between the mass of the object and those in its immediate neighborhood. Used to distinguish between a planet and a dwarf planet.
  8. ^ This object's rotation is synchronous with its orbital period, meaning that it only ever shows one face to its primary.
  9. ^ Objects' planetary discriminants based on their similar orbits to Eris. Sedna's population is currently too little-known for a planetary discriminant to be determined.
  10. ^ Proteus average diameter: 210 km;[68] Mimas average diameter: 199 km[75]
  11. ^ "Unless otherwise cited" means that the information contained in the citation is applicable to an entire line or column of a chart, unless another citation specifically notes otherwise.

References

  1. ↑ Woolfson, Michael Mark (2000). "The Origin and Evolution of the Solar System". Astronomy & Geophysics. 41 (1): 1.12. Bibcode:2000A&G....41a..12W. doi:10.1046/j.1468-4004.2000.00012.x.
  2. ↑ NASA Solar System exploration Sun factsheet Archived 2008-01-02 at the Wayback Machine. and NASA Sun factsheet Archived 2010-07-15 at the Wayback Machine. NASA Retrieved on 2008-11-17 (unless otherwise cited)
  3. 1 2 Leong, Stacy (2002). Elert, Glenn, ed. "Period of the Sun's Orbit around the Galaxy (Cosmic Year)". The Physics Factbook (self-published). Retrieved 2008-06-26.
  4. ↑ Aschwanden, Markus J. (2007). "The Sun". In McFadden, Lucy Ann; Weissman, Paul R.; Johnsson, Torrence V. Encyclopedia of the Solar System. Academic Press. p. 80.
  5. ↑ "IAU 2006 General Assembly: Result of the IAU Resolution votes" (Press release). International Astronomical Union (News Release – IAU0603). 2006-08-24. Retrieved 2007-12-31. (orig link Archived 2007-01-03 at the Wayback Machine.)
  6. ↑ NASA Mercury Fact Sheet Archived 2015-11-06 at the Wayback Machine. and NASA Solar System Exploration Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  7. ↑ NASA Venus Factsheet Archived 2016-03-10 at WebCite and NASA Solar System Exploration Factsheet Archived 2006-09-29 at the Wayback Machine. NASA Retrieved on 2008-11-17 (unless otherwise cited)
  8. 1 2 NASA Earth factsheet and NASA Solar System Exploration Factsheet Archived 2009-08-27 at the Wayback Machine. NASA Retrieved on 2008-11-17 (unless otherwise cited)
  9. ↑ NASA Mars Factsheet Archived 2010-06-12 at the Wayback Machine. and NASA Mars Solar System Exploration Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  10. ↑ NASA Jupiter factsheet Archived 2011-10-05 at WebCite and NASA Solar System Exploration Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  11. ↑ NASA Saturn factsheet Archived 2011-08-21 at WebCite and NASA Solar System Exploration Saturn Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  12. ↑ NASA Uranus factsheet Archived 2011-08-11 at WebCite and NASA Solar System Exploration Uranus Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  13. ↑ NASA Neptune factsheet and NASA Solar System Exploration Neptune Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  14. ↑ "NASA Asteroid Factsheet". NASA. Archived from the original on 2010-01-18. Retrieved 2008-11-17.
  15. 1 2 NASA Pluto factsheet and NASA Solar System Exploration Pluto Factsheet Retrieved on 2008-11-17 (unless otherwise cited)
  16. ↑ (i) Lockwood, Alexandra C.; Brown, Michael (Mike) E.; Stansberry, John A. (2014). "The Size and Shape of the Oblong Dwarf Planet Haumea". Earth, Moon, and Planets. 111: 127–137. arXiv:1402.4456v1. Bibcode:2014EM&P..111..127L. doi:10.1007/s11038-014-9430-1.
    (ii) Rabinowitz, David L.; Barkume, Kristina M.; Brown, Michael (Mike) E.; 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. arXiv:astro-ph/0509401. Bibcode:2006ApJ...639.1238R. doi:10.1086/499575.
    (iii) "Jet Propulsion Laboratory Small-Body Database Browser: 136108 Haumea". NASA's Jet Propulsion Laboratory (2008-05-10 last obs). Retrieved 2008-11-13. (unless otherwise cited)
  17. ↑ (i) Buie, Marc W. (2008-04-05). "Orbit Fit and Astrometric record for 136472". SwRI (Space Science Department). Retrieved 2008-07-13.
    (ii) "NASA Small Bodies Database Browser: 136472 Makemake (2005 FY9)". NASA JPL. Retrieved 2008-10-03. (unless otherwise cited)
  18. ↑ "NASA Small Body Database Browser: Eris". NASA JPL. Retrieved 2008-11-13. (unless otherwise cited)
  19. ↑ https://www.youtube.com/watch?v=dWr29KIs2Ns NASA. 24 July 2015. Event occurs at 52:30. Retrieved 30 July 2015. We had an uncertainty that ranged over maybe 70 kilometers, we've collapsed that to plus and minus two, and it's centered around 1186
  20. 1 2 Lockwood, Alexandra C.; Brown, Michael (Mike) E.; Stansberry, John A. (2014). "The Size and Shape of the Oblong Dwarf Planet Haumea". Earth, Moon, and Planets. 111: 127–137. arXiv:1402.4456v1. Bibcode:2014EM&P..111..127L. doi:10.1007/s11038-014-9430-1.
  21. ↑ Lellouch, Emmanuel; Kiss, Csaba; Santos-Sanz, Pablo; et al. (2010). ""TNOs are cool": A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea". Astronomy and Astrophysics. 518: L147. arXiv:1006.0095. Bibcode:2010A&A...518L.147L. doi:10.1051/0004-6361/201014648.
  22. ↑ Brown, Michael (Mike) E. (2013). "On the size, shape, and density of dwarf planet Makemake".
  23. 1 2 3 Stansberry, John A.; Grundy, Will M.; Brown, Michael (Mike) E.; et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". The Solar System beyond Neptune. University of Arizona Press: 161. arXiv:astro-ph/0702538. Bibcode:2008ssbn.book..161S.
  24. ↑ Brown, Michael (Mike) E.; Bouchez, Antonin H.; Rabinowitz, David L.; et al. (October 2005). "Keck Observatory laser guide star adaptive optics discovery and characterization of a satellite to large Kuiper belt object 2003 EL61". The Astrophysical Journal Letters. 632 (L45): L45. Bibcode:2005ApJ...632L..45B. doi:10.1086/497641.
  25. ↑ Brown, Michael (Mike) E.; Schaller, Emily L. (15 June 2007). "The Mass of Dwarf Planet Eris". Science. 316 (5831): 1585. Bibcode:2007Sci...316.1585B. doi:10.1126/science.1139415. PMID 17569855.
  26. ↑ Saint-Pé, Olivier; Combes, Michel; Rigaut, François J. (1993). "Ceres surface properties by high-resolution imaging from Earth". Icarus. 105 (2): 271–281. Bibcode:1993Icar..105..271S. doi:10.1006/icar.1993.1125.
  27. ↑ Than, Ker (2006). "Astronomers: Pluto colder than expected". Space.com (via CNN.com). Retrieved on 2006-03-05.
  28. ↑ Trujillo, Chadwick A.; Brown, Michael (Mike) E.; Barkume, Kristina M.; et al. (February 2007). "The Surface of 2003 EL61 in the Near Infrared". The Astrophysical Journal. 655 (2): 1172–1178. arXiv:astro-ph/0601618. Bibcode:2007ApJ...655.1172T. doi:10.1086/509861.
  29. ↑ Brown, Michael (Mike) E.; Barkume, Kristina M.; Blake, Geoffrey A.; et al. (2007). "Methane and Ethane on the Bright Kuiper Belt Object 2005 FY9". The Astronomical Journal. 133 (1): 284–289. Bibcode:2007AJ....133..284B. doi:10.1086/509734.
  30. ↑ Licandro, Javier; Grundy, Will M.; Pinilla-Alonso, Noemi; de Leon, Jerome P. (2006). "Visible spectroscopy of 2003 UB313: evidence for N2 ice on the surface of the largest TNO?" (PDF). Astronomy and Astrophysics. 458 (1): L5–L8. arXiv:astro-ph/0608044. Bibcode:2006A&A...458L...5L. doi:10.1051/0004-6361:20066028.
  31. ↑ Ragozzine, Darin; Brown, Michael (Mike) E.; Trujillo, Chadwick A.; Schaller, Emily L. "Orbits and Masses of the 2003 EL61 Satellite System". AAS DPS conference 2008. Archived from the original on 2013-07-18. Retrieved 2008-10-17.
  32. ↑ Chang, Kenneth (26 April 2016). "Makemake, the Moonless Dwarf Planet, Has a Moon, After All". New York Times. Retrieved 26 April 2016.
  33. ↑ Brown, Michael (Mike) E.; van Dam, Marcos A.; Bouchez, Antonin H.; et al. (2006). "Satellites of the largest Kuiper belt objects". The Astrophysical Journal. 639 (1): L43–L46. arXiv:astro-ph/0510029. Bibcode:2006ApJ...639L..43B. doi:10.1086/501524.
  34. ↑ Brown, Michael (Mike) E. "The Dwarf Planets". Caltech. Retrieved 2008-09-25.
  35. ↑ Gingerich, Owen (2006-08-16). "The Path to Defining Planets" (PDF). Harvard-Smithsonian Center for Astrophysics and IAU EC Planet Definition Committee chair. p. 4. Retrieved 2007-03-13.
  36. ↑ "JPL Small-Body Database Browser: 90482 Orcus (2004 DW)" (2008-02-10 last obs). NASA JPL. Retrieved 2008-07-02. (unless otherwise cited)
  37. ↑ "JPL Small-Body Database Browser: 28978 Ixion (2001 KX76)" (2007-07-12 last obs). NASA JPL. Retrieved 2008-10-04. (unless otherwise cited)
  38. ↑ "JPL Small-Body Database Browser: 307261 (2002 MS4)" (2009-09-19 last obs). Retrieved 2013-12-23. (unless otherwise cited)
  39. ↑ "JPL Small-Body Database Browser: 120347 Salacia" (2010-11-05 last obs). Retrieved 2013-12-23. (unless otherwise cited)
  40. ↑ "JPL Small-Body Database Browser: 20000 Varuna (2000 WR106)" (2007-11-17 last obs). NASA JPL. Retrieved 2008-07-02. (unless otherwise cited)
  41. ↑ "JPL Small-Body Database Browser: (2005 UQ513)" (2008-11-29 last obs). Retrieved 2008-07-31. (unless otherwise cited)
  42. ↑ "NASA JPL Database Browser: 50000 Quaoar". NASA JPL. Retrieved 2008-12-19. (unless otherwise cited)
  43. ↑ "NASA Small Bodies Database Browser: 2007 OR10". NASA JPL. Retrieved 2008-12-20. (unless otherwise cited)
  44. ↑ "JPL Small-Body Database Browser: 229762 (2007 UK126)" (2009-12-20 last obs). Retrieved 2010-05-02. (unless otherwise cited)
  45. ↑ Buie, Marc W. (2007-08-13). "Orbit Fit and Astrometric record for 90377". Deep Ecliptic Survey. Retrieved 2006-01-17. (unless otherwise cited)
  46. ↑ Vilenius, Esa; Kiss, Csaba; Mommert, Michael; et al. (April 4, 2012). ""TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects". Astronomy & Astrophysics. 541: A94. arXiv:1204.0697. Bibcode:2012A&A...541A..94V. doi:10.1051/0004-6361/201118743.
  47. ↑ Fornasier, Sonia; Lellouch, Emmanuel; Müller, Thomas G.; et al. (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" (PDF).
  48. 1 2 Brown, Michael (Mike) E.; Ragozzine, Darin; Stansberry, John A.; Fraser, Wesley C. (2009). "The size, density, and formation of the Orcus-Vanth system in the Kuiper belt". Astronomical Journal. 139 (6): 2700. arXiv:0910.4784. Bibcode:2010AJ....139.2700B. doi:10.1088/0004-6256/139/6/2700.
  49. 1 2 Stansberry, John A. (2012). "Physical Properties of Trans-Neptunian Binaries (120347) Salacia–Actaea and (42355) Typhon–Echidna". Icarus. Elsevier. 219: 676–688. Bibcode:2012Icar..219..676S. doi:10.1016/j.icarus.2012.03.029. Retrieved 2012-04-27.
  50. 1 2 Brown, Michael (Mike) E.; Fraser, Wesley C. (2009). Quaoar: A Rock in the Kuiper Belt. DPS meeting #41. American Astronomical Society. Bibcode:2009DPS....41.6503F. (Backup reference)
  51. 1 2 Jewitt, David C. & Sheppard, Scott S. (2002). "Physical Properties of Trans-Neptunian Object (20000) Varuna". The Astronomical Journal. 123 (4): 2110–2120. arXiv:astro-ph/0201082. Bibcode:2002AJ....123.2110J. doi:10.1086/339557. Retrieved on 2008-12-19.
  52. ↑ "Case of Sedna's Missing Moon Solved". Harvard Smithsonian Center for Astrophysics. 2005. Retrieved 2011-07-05.
  53. ↑ Distant EKO The Kuiper Belt Electronic newsletter, March 2007 Retrieved on 2008-11-17
  54. ↑ "IAUC 8812: Sats OF 2003 AZ_84, (50000), (55637), (90482); V1281 Sco; V1280 Sco". International Astronomical Union. Retrieved 2011-07-05.
  55. ↑ (229762) 2007 UK126, Johnston's Archive. Last updated 20 September 2011
  56. ↑ NASA Moon factsheet and NASA Solar System Exploration Moon Factsheet NASA Retrieved on 2008-11-17 (unless otherwise cited)
  57. ↑ "NASA Io Factsheet". NASA. Retrieved 2008-11-16. (unless otherwise cited)
  58. ↑ "NASA Europa Factsheet". NASA. Retrieved 2008-11-16. (unless otherwise cited)
  59. ↑ "NASA Ganymede Factsheet". NASA. Retrieved 2008-11-16. (unless otherwise cited)
  60. ↑ "NASA Callisto Factsheet". NASA. Retrieved 2008-11-16.
  61. ↑ Bills, Bruce G. (2005). "Free and forced obliquities of the Galilean satellites of Jupiter". Icarus. 175 (1): 233–247. Bibcode:2005Icar..175..233B. doi:10.1016/j.icarus.2004.10.028.
  62. ↑ Orton, Glenn S.; Spencer, John R.; Travis, Larry D.; et al. (1996). "Galileo Photopolarimeter-radiometer observations of Jupiter and the Galilean Satellites". Science. 274 (5286): 389–391. Bibcode:1996Sci...274..389O. doi:10.1126/science.274.5286.389.
  63. ↑ Pearl, John C.; Hanel, Rudolf A.; Kunde, Virgil G.; et al. (1979). "Identification of gaseous SO2 and new upper limits for other gases on Io". Nature. 288 (5725): 755. Bibcode:1979Natur.280..755P. doi:10.1038/280755a0.
  64. ↑ Hall, Doyle T.; et al.; Detection of an oxygen atmosphere on Jupiter's moon Europa, Nature, Vol. 373, 1995, pp. 677–679 (accessed 2006-15-04)
  65. ↑ Hall, Doyle T.; Feldman, Paul D.; McGrath, Melissa A.; Strobel, Darrell F. (1998). "The Far-Ultraviolet Oxygen Airglow of Europa and Ganymede". The Astrophysical Journal. 499 (1): 475–481. Bibcode:1998ApJ...499..475H. doi:10.1086/305604. Retrieved on 2008-11-17.
  66. ↑ Liang, Mao-Chang; Lane, Benjamin F.; Pappalardo, Robert T.; et al. (2005). "Atmosphere of Callisto" (PDF). Journal of Geophysical Research. 110 (E02003): E02003. Bibcode:2005JGRE..11002003L. doi:10.1029/2004JE002322. Archived from the original (PDF) on 2009-02-25. Retrieved on 2008-11-17.
  67. ↑ Waite, J. Hunter, Jr.; Combi, Michael R.; Ip, Wing-Huen; et al. (2006). "Cassini Ion and Neutral Mass Spectrometer: Enceladus Plume Composition and Structure". Science. 311 (5766): 1419–1422. Bibcode:2006Sci...311.1419W. doi:10.1126/science.1121290. PMID 16527970. Retrieved on 2008-11-17.
  68. 1 2 Triton info taken from NASA Neptunian Satellite Fact Sheet Archived 2011-10-05 at WebCite NASA Retrieved on 2009-01-18 (unless otherwise cited)
  69. ↑ Hasenkopf, Christa A.; Beaver, Melinda R.; Tolbert, Margaret A.; et al. (2007). "Optical Properties of Titan Haze Laboratory Analogs Using Cavity Ring Down Spectroscopy" (PDF). Workshop on Planetary Atmospheres. Archived from the original (PDF) on 2014-05-26. Retrieved 2007-10-16.
  70. ↑ Tryka, Kimberly; Brown, Robert H.; Anicich, Vincent; et al. (August 1993). "Spectroscopic Determination of the Phase Composition and Temperature of Nitrogen Ice on Triton". Science. 261 (5122): 751–754. Bibcode:1993Sci...261..751T. doi:10.1126/science.261.5122.751. PMID 17757214.
  71. ↑ Niemann, Hasso B.; Atreya, Sushil K.; Bauer, Sven J.; et al. (2005). "The abundances of constituents of Titan's atmosphere from the GCMS instrument on the Huygens probe". Nature. 438 (7069): 779–784. Bibcode:2005Natur.438..779N. doi:10.1038/nature04122. PMID 16319830.
  72. ↑ Broadfoot, A. Lyle; Atreya, Sushil K.; Bertaux, Jean-Loup; et al. (1989-12-15). "Ultraviolet Spectrometer Observations of Neptune and Triton". Science. 246 (4936): 1459–1466. Bibcode:1989Sci...246.1459B. doi:10.1126/science.246.4936.1459. PMID 17756000.
  73. ↑ Soter, Stephen (2006-08-16). "What is a Planet?". The Astronomical Journal. 132 (6): 2513–2519. arXiv:astro-ph/0608359. Bibcode:2006AJ....132.2513S. doi:10.1086/508861.
  74. ↑ Iorio, Lorenzo (March 2007). "Dynamical determination of the mass of the Kuiper Belt from motions of the inner planets of the Solar system". Monthly Notices of the Royal Astronomical Society. 375 (4): 1311–1314. arXiv:gr-qc/0609023. Bibcode:2007MNRAS.375.1311I. doi:10.1111/j.1365-2966.2006.11384.x.
  75. 1 2 NASA Saturnian Satellite Fact Sheet NASA Retrieved on 2008-11-17
  76. ↑ "NASA Solar System Exploration: Planet Symbols". NASA. Retrieved 2009-01-26.
  77. ↑ Hilton, James L. "When did asteroids become minor planets?" (PDF). U.S. Naval Observatory. Retrieved 2008-10-25.
  78. ↑ "NASA Uranian Satellite Fact Sheet". NASA. Archived from the original on 2010-01-18. Retrieved 2008-11-17.
  79. ↑ Seidelmann, P. Kenneth, ed. (1992). Explanatory Supplement to the Astronomical Almanac. University Science Books. p. 384.
  80. ↑ Sheppard, Scott S. "The Jupiter Satellite Page". Carnegie Institution for Science, Department of Terrestrial Magnetism. Retrieved 2008-04-02.
  81. ↑ Bruton, Dan. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). Archived from the original on 2010-03-23. Retrieved 2009-01-20.

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