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Moons

Moons, Saturn to Pluto

Source: NASA

Saturn's Moons

  Mass (1020 kg) Radius (km) Mean density (kg/m3)
 Visual geometric albedo
Mimas (SI) 0.375 209 x 196 x 191 1140 0.5
Enceladus (SII) 0.65 256 x 247 x 245 1000 1.0
Tethys (SIII) 6.27 536 x 528 x 526 1000 0.9
Dione (SIV) 11.0 560 1500 0.7
Rhea (SV) 23.1 764 1240 0.7
Titan (SVI) 1,345.5 2,575 1881 0.22
Hyperion (SVII) 0.2 185 x 140 x 113 1500 0.3
Iapetus (SVIII) 15.9 718 1020 0.05 / 0.5
Pan (SXVIII) 0.00003 10 630 0.5
Atlas (SXV) 0.0001 18.5 x 17.2 x 13.5 630 0.8
Prometheus (SXVI) 0.0033 74 x 50 x 34 630 0.5
Pandora (SXVII) 0.0020 55 x 44 x 31 630 0.7
Epimetheus (SXI) 0.0054 69 x 55 x 55 600 0.8
Janus (SX) 0.0192 97 x 95 x 77 650 0.9
Calypso (SXIV) 0.00004 15 x 8 x 8 1000 1.0
Telesto (SXIII) 0.00007 15 x 12.5 x 7.5 1000 1.0
Helene (SXII) 0.0003 18 x 16 x 15 1500 0.7
Phoebe (SIX) 0.072 115 x 110 x 105 1300 0.08
S/2000 S 1 NA ~8 NA 0.06
S/2000 S 2 NA ~10 NA 0.06
S/2000 S 3 NA ~16 NA 0.06
S/2000 S 4 NA ~7 NA 0.06
S/2000 S 5 NA ~7 NA 0.06
S/2000 S 6 NA ~5 NA 0.06
S/2000 S 7 NA ~3 NA 0.06
S/2000 S 8 NA ~3 NA 0.06
S/2000 S 9 NA ~3 NA 0.06
S/2000 S 10 NA ~4 NA 0.06
S/2000 S 11 NA ~13 NA 0.06
S/2000 S 12 NA ~3 NA 0.06
S/2003 S 1 NA ~3 NA 0.06

Orbital parameters

                             Semimajor Axis
 

(103 km)

 (Saturnian Radii) Orbital Period* Days Rotation Period Days Inclination (degrees) Eccentricity
Mimas (SI) 185.52 3.0783 0.9424218 S 1.53 0.0202
Enceladus (SII) 238.02 3.9494 1.370218 S 0.00 0.0045
Tethys (SIII) 294.66 4.8892 1.887802 S 1.86 0.0000
Dione (SIV) 377.40 6.2620 2.736915 S 0.02 0.0022
Rhea (SV) 527.04 8.7449 4.517500 S 0.35 0.0010
Titan (SVI) 1,221.83 20.273 15.945421 NA 0.33 0.0292
Hyperion (SVII) 1,481.1 24.575 21.276609 C 0.43 0.1042
Iapetus (SVIII) 3,561.3 59.091 79.330183 S 14.72 0.0283
Pan (SXVIII) 133.583 2.2165 0.5750 NA 0.0 0.000
Atlas (SXV) 137.670 2.2820 0.6019 NA 0.3 0.000
Prometheus (SXVI) 139.353 2.2843 0.6130 NA 0.0 0.0024
Pandora (SXVII) 141.700 2.3512 0.6285 NA 0.0 0.0042
Epimetheus (SXI) 151.422 2.5099 0.6942 S 0.34 0.009
Janus (SX) 151.472 2.5125 0.6945 S 0.14 0.007
Calypso (SXIV) 294.66 4.8892 1.8878 NA ~0 ~0
Telesto (SXIII) 294.66 4.8892 1.8878 NA ~0 ~0
Helene (SXII) 377.40 6.262 2.7369 NA 0.0 0.005
Phoebe (SIX) 12,952 214.91 550.48R 0.4 175.3 0.1633
S/2000 S 1 23,100 383. 1312R NA 173.1 0.33
S/2000 S 2 15,200 252. 687 NA 47.2 0.36
S/2000 S 3 18,160 301. 893 NA 45.6 0.29
S/2000 S 4 18,240 303. 926 NA 34.9 0.54
S/2000 S 5 11,370 189. 449 NA 48.7 0.33
S/2000 S 6 11,440 190. 451 NA 49.1 0.32
S/2000 S 7 20,470 340. 1089R NA 175.0 0.47
S/2000 S 8 15,650 260. 729R NA 148.5 0.27
S/2000 S 9 18,710 310. 951R NA 169.4 0.21
S/2000 S 10 17,610 292. 871 NA 33.5 0.47
S/2000 S 11 16,390 272. 738 NA 34.0 0.48
S/2000 S 12 19,470 323. 1017R NA 175.8 0.11
S/2003 S 1 18,720 311. 956R NA 134.6 0.35

 

*R indicates retrograde motion
S indicates synchronous rotation - the rotation period is the same as the orbital period
C indicates chaotic rotation
NA indicates no data available

Uranus's Moons

  Mass (1020 kg) Radius (km) Mean density (kg/m3)

Visual geometric albedo
Miranda (V) 0.66 240 x 234.2 x 232.9 1,200 0.27
Ariel (I) 13.5 581.1 x 577.9 x 577.7 1,670 0.35
Umbriel (II) 11.7 584.7 1,400 0.19
Titania (III) 35.2 788.9 1,710 0.28
Oberon (IV) 30.1 761.4 1,630 0.25
Cordelia (VI, 1986 U7) NA 20 NA 0.07
Ophelia (VII, 1986 U8) NA 21 NA 0.07
Bianca (VIII, 1986 U9) NA 27 NA 0.07
Cressida (IX, 1986 U3) NA 40 NA 0.07
Desdemona (X, 1986 U6) NA 32 NA 0.07
Juliet (XI, 1986 U2) NA 47 NA 0.07
Portia (XII, 1986 U1) NA 68 NA 0.07
Rosalind (XIII, 1986 U4) NA 36 NA 0.07
Belinda (XIV, 1986 U5) NA 40 NA 0.07
Puck (XV, 1985 U1) NA 81 NA 0.07
Caliban (XVI, S/1997 U1) NA 48 NA 0.07
Stephano (XX, 1999 U2) NA 10 NA 0.07
Sycorax (XVII, S/1997 U2) NA 95 NA 0.07
Prospero (XVIII, 1999 U3) NA 15 NA 0.07
Setebos (XIX, 1999 U1) NA 15 NA 0.07
S/2001 U1 NA 10 NA NA

Orbital parameters

                             Semimajor Axis
 

(103 km)

 (Uranian Radii) Orbital Period* Days Rotation Period Days Inclination (degrees) Eccentricity
Miranda (V) 129.39 5.078 1.413479 S 4.22 0.0027
Ariel (I) 191.02 7.481 2.520379 S 0.31 0.0034
Umbriel (II) 266.30 10.41 4.144177 S 0.36 0.0050
Titania (III) 435.91 17.05 8.705872 S 0.14 0.0022
Oberon (IV) 583.52 22.79 13.463239 S 0.10 0.0008
Cordelia (VI, 1986 U7) 49.77 1.947 0.335034 NA 0.08 0.0003
Ophelia (VII, 1986 U8) 53.79 2.104 0.376400 NA 0.10 0.0099
Bianca (VIII, 1986 U9) 59.17 2.315 0.434579 NA 0.19 0.0009
Cressida (IX, 1986 U3) 61.78 2.417 0.463570 NA 0.01 0.0004
Desdemona (X, 1986 U6) 62.68 2.452 0.473650 NA 0.11 0.0001
Juliet (XI, 1986 U2) 64.35 2.518 0.493065 NA 0.07 0.0007
Portia (XII, 1986 U1) 66.09 2.586 0.513196 NA 0.06 0.0000
Rosalind (XIII, 1986 U4) 69.94 2.736 0.558460 NA 0.28 0.0001
Belinda (XIV, 1986 U5) 75.26 2.944 0.623527 NA 0.03 0.0001
Puck (XV, 1985 U1) 86.01 3.365 0.761833 NA 0.32 0.0001
Caliban (XVI, 1997 U1) 7230. 282.9 579.5R NA 140.88 0.159
Stephano (XX, 1999 U2) 8002. 313.1 676.5R NA 144.06 0.230
Sycorax (XVII, 1997 U2) 12179. 476.5 1283.4R NA 159.40 0.522
Prospero (XVIII, 1999 U3) 16418. 642.4 1992.8R NA 151.91 0.443
Setebos (XIX, 1999 U1) 17459. 683.1 2202.3R NA 158.17 0.588
S/2001 U1 8571. 335.3 758.1R NA 166.33 0.208

R indicates retrograde motion
S indicates synchronous rotation - the rotation period is the same as the orbital period
NA indicated no data available

Neptune's Moons

  Mass (1020 kg) Radius (km) Mean density (kg/m3) Visual geometric albedo
Naiad (NIII) NA 29 NA 0.06
Thalassa (NIV) NA 40 NA 0.06
Despina (NV) NA 74 NA 0.06
Galatea (NVI) NA 79 NA 0.06
Larissa (NVII) NA 104 x 89 NA 0.06
Proteus (NVIII) NA 218 x 208 x 201 NA 0.06
Triton (NI) 214. 1,353.4 2,050 0.77
Nereid (NII) 0.2 170 1,000 0.4
S/2002 N1 NA 20 NA NA
S/2002 N2 NA 20 NA NA
S/2002 N3 NA 20 NA NA 
Orbital parameters
       
                              Semimajor axis
  (103 km) (Neptunian Radii) Orbital Period* days Rotation Period Days Inclination degrees Eccentricity
Naiad (NIII) 48.227 1.948 0.294396 NA 4.74 0.0003
Thalassa (NIV) 50.075 2.022 0.311485 NA 0.21 0.0002
Despina (NV) 52.526 2.121 0.334655 NA 0.07 0.0001
Galatea (NVI) 61.953 2.502 0.428745 NA 0.05 0.0001
Larissa (NVII) 73.548 73.548 0.554654 NA 0.20 0.0014
Proteus (NVIII) 117.647 4.751 1.122315 NA 0.04 0.0004
Triton (NI) 354.76 14.328 5.876854R S 157.345 0.000016
Nereid (NII) 5,513.4 222.67 360.13619 NA 7.23 0.7512
S/2002 N1 21990. 888.0 2868.4 NA 121. 0.43
S/2002 N2 20200. 815.7 2525.4 NA 57. 0.17
S/2002 N3 21390. 863.8 2751.8 NA 43. 0.47

*R indicates retrograde motion
S indicates synchronous rotation - the rotation period is the same as the orbital period
NA indicates no data available

Pluto's Moon

Charon
Mean distance from Pluto (km) 19,600
Sidereal orbit period (days) 6.38725
Sidereal rotation period (days) 6.38725
Orbital inclination to Pluto (deg) 0.0
Orbital eccentricity 0.0
Equatorial radius (km) 593
Mass (1021 kg) 1.9
Mean density (kg/m3) 2000
Surface gravity (m/s2) 0.21
Escape velocity (km/s) 0.58
Geometric albedo 0.38
Apparent visual magnitude 16.8

 

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