Properties of the planetary satellites of the solar system

compiled by Wm. Robert Johnston
last updated 3 November 2019

planetsatellitediameter/dimensions
(see note)
densitymean distance from planetorbital periodorbital eccentricityorbital inclinationdate discovered
numbernameprovisonal des.kmkg/m3kmdaysdegrees
Earth I Moon 3,476 x 3,476 x 3,471 3,346 384,400 27.321662 0.054900 23.43 N/A
Mars I Phobos 26 x 23 x 18 1,876 9,376 0.31891023 0.0151 1.08 11 AUG 1877
II Deimos 16 x 12 x 10 1,471 23,458 1.262441 0.0003 1.79 17 AUG 1877
Jupiter XVI Metis S/1979 J3 60 x 40 x 40 ? 128,100 0.2947802 0.0012 0.019 4 MAR 1979
XV Adrastea S/1979 J1 20 x 16 x 14 ? 128,900 0.2982614 0.0018 0.054 8 JUL 1979
V Amalthea 250 x 146 x 128 860 181,366 0.49817905 0.0032 0.37 9 SEP 1892
XIV Thebe S/1979 J2 116 x 98 x 84 ? 221,889 0.6745 0.0176 1.08 5 MAR 1979
I Io 3,659 x 3,638 x 3,632 3,527 421,800 1.769138 0.0041 0.036 8 JAN 1610
II Europa 3,125 x 3,121 x 3,119 3,013 671,100 3.551181 0.0094 0.466 8 JAN 1610
III Ganymede 5,269 x 5,266 x 5,263 1,938 1,070,400 7.154553 0.0013 0.177 7 JAN 1610
IV Callisto 4,821 1,834 1,882,700 16.689018 0.0074 0.192 7 JAN 1610
XVIII Themisto S/1975 J1 10 ? 7,507,000 130 0.242 43.08 30 SEP 1975
XIII Leda 22 ? 11,165,000 240.5 0.164 27.46 10 SEP 1974
VI Himalia 150 x 120 1,900 11,461,000 249.6 0.162 27.5 3 NOV 1904
LXXI Ersa S/2018 J1 4 ? 11,483,000 2018
LXV Pandia S/2017 J4 4 ? 11,525,000 2017
X Lysithea 42 ? 11,717,000 257.9 0.112 28.3 6 JUL 1938
VII Elara 80 ? 11,741,000 258.9 0.217 26.63 2 JAN 1905
LIII Dia S/2000 J11 5 ? 12,118,000 287 0.211 28.23 5 DEC 2000
XLVI Carpo S/2003 J20 4 ? 16,989,000 456.1 0.43 51.4 9 FEB 2003
LXII Valetudo S/2016 J2 3 ? 18,980,000 2016
S/2003 J12 3 ? 19,002,500 533.3 0.376 145.8 5 FEB 2003
XXXIV Euporie S/2001 J10 4 ? 19,302,000 550.7 0.144 145.8 11 DEC 2001
S/2003 J18 3 ? 20,274,000 606.3 0.119 146.5 6 FEB 2003
LII S/2010 J2 3 ? 20,307,200 588.1 0.307 150.4 8 SEP 2010
S/2017 J7 3 ? 20,627,000 2017
S/2016 J1 3 ? 20,650,800 2016
S/2017 J3 3 ? 20,694,000 2017
XXXV Orthosie S/2001 J9 4 ? 20,721,000 622.6 0.281 145.9 11 DEC 2001
XXXIII Euanthe S/2001 J7 4 ? 20,799,000 620.6 0.232 148.9 11 DEC 2001
XXIX Thyone S/2001 J2 6 ? 20,940,000 627.3 0.229 148.5 11 DEC 2001
S/2003 J16 4 ? 21,000,000 595.4 0.27 148.6 6 FEB 2003
XL Mneme S/2003 J21 4 ? 21,069,000 620 0.227 148.6 6 FEB 2003
XXII Harpalyke S/2000 J5 6 ? 21,105,000 623.3 0.226 148.6 23 NOV 2000
XXX Hermippe S/2001 J3 6 ? 21,131,000 633.9 0.21 150.7 12 DEC 2001
XXVII Praxidike S/2000 J7 7 ? 21,147,000 625.3 0.23 149 23 NOV 2000
XLII Thelxinoe S/2003 J22 3 ? 21,162,000 628.1 0.221 151.4 9 FEB 2003
LX Eupheme S/2003 J3 3 ? 21,199,700 504 0.241 143.7 5 FEB 2003
XLV Helike S/2003 J6 5 ? 21,263,000 634.8 0.156 154.8 6 FEB 2003
XXIV Iocaste S/2000 J3 7 ? 21,269,000 631.5 0.216 149.4 23 NOV 2000
XII Ananke 29 ? 21,276,000 626.6 0.244 148.89 29 SEP 1951
S/2017 J9 4 ? 21,487,000 2017
S/2003 J9 3 ? 22,441,700 683 0.269 164.5 6 FEB 2003
S/2017 J6 3 ? 22,455,000 2017
S/2011 J1 3 ? 22,462,000 580.7 0.296 162.8 27 SEP 2011
S/2003 J19 3 ? 22,757,000 701.3 0.334 162.9 27 FEB 2003
LVIII Philophrosyne S/2003 J15 3 ? 22,820,000 668.4 0.11 140.8 6 FEB 2003
XXXII Eurydome S/2001 J4 5 ? 22,865,000 717.3 0.276 150.3 9 DEC 2001
XLIII Arche S/2002 J1 4 ? 22,931,000 723.9 0.259 165 31 OCT 2002
XXVIII Autonoe S/2001 J1 6 ? 23,039,000 762.7 0.334 152.9 10 DEC 2001
XXXVIII Pasithee S/2001 J6 4 ? 23,096,000 719.5 0.267 165.1 11 DEC 2001
L Herse S/2003 J17 3 ? 23,097,000 715.4 0.2 164.2 6 FEB 2003
XXI Chaldene S/2000 J10 5 ? 23,179,000 723.8 0.251 165.2 26 NOV 2000
XXVI Isonoe S/2000 J6 5 ? 23,217,000 725.5 0.246 165.2 26 NOV 2000
XXXVII Kale S/2001 J8 4 ? 23,217,000 729.5 0.26 165 9 DEC 2001
XXXI Aitne S/2001 J11 5 ? 23,231,000 730.2 0.264 165.1 9 DEC 2001
S/2017 J5 3 ? 23,232,000 2017
S/2017 J8 3 ? 23,232,700 2017
S/2003 J4 4 ? 23,257,920 723.2 0.204 144.9 9 FEB 2003
XXV Erinome S/2000 J4 5 ? 23,279,000 728.3 0.266 164.9 23 NOV 2000
S/2017 J2 3 ? 23,303,000 2017
LI S/2010 J1 4 ? 23,314,300 723.2 0.32 163.2 7 SEP 2010
XX Taygete S/2000 J9 7 ? 23,360,000 732.2 0.252 165.2 23 NOV 2000
XI Carme 47 ? 23,404,000 722.9 0.253 164.91 30 JUL 1938
S/2011 J2 3 ? 23,463,900 726.8 0.387 151.9 27 SEP 2011
XXXVI Sponde S/2001 J5 4 ? 23,487,000 748.3 0.312 151 9 DEC 2001
S/2017 J1 3 ? 23,547,100 2017
XXIII Kalyke S/2000 J2 7 ? 23,583,000 743 0.245 165.2 25 NOV 2000
VIII Pasiphae 58 ? 23,624,000 740.2 0.409 151.43 27 JAN 1908
XLVII Eukelade S/2003 J1 5 ? 23,661,000 746.4 0.272 165.5 5 FEB 2003
LVII Eirene S/2003 J5 5 ? 23,731,800 759.7 0.21 165 6 FEB 2003
XIX Megaclite S/2000 J8 7 ? 23,806,000 752.8 0.421 152.8 25 NOV 2000
IX Sinope 35 ? 23,939,000 743 0.25 158.11 21 JUL 1914
XXXIX Hegemone S/2003 J8 5 ? 23,947,000 739.6 0.328 155.2 8 FEB 2003
XLI Aoede S/2003 J7 5 ? 23,981,000 761.5 0.432 158.3 5 FEB 2003
XLIV Kallichore S/2003 J11 3 ? 24,043,000 764.7 0.264 165.5 6 FEB 2003
S/2003 J23 3 ? 24,055,500 759.7 0.309 149.2 8 FEB 2003
XVII Callirrhoe S/1999 J1 10 ? 24,102,000 758.8 0.283 147.1 19 OCT 1999
S/2003 J10 3 ? 24,249,600 767 0.214 164.1 8 FEB 2003
XLVIII Cyllene S/2003 J13 4 ? 24,349,000 737.8 0.319 149.3 9 FEB 2003
XLIX Kore S/2003 J14 3 ? 24,543,000 779.2 0.325 145 8 FEB 2003
S/2003 J2 4 ? 28,570,400 982.5 0.38 151.8 5 FEB 2003
Saturn S/2009 S1 0.3 ? 117,000 0.4714 0.0 0.0 16 JUL 2009
XVIII Pan S/1981 S13 35 x 28 x 21 400 133,584 0.57505073 0.0000348 0.001 16 JUL 1990
[Earhart] 0.5 ? 133,798
[Santos-Dumont] 0.2 400 134,525
[Bleriot] 0.9 400 134,912
XXXV Daphnis S/2005 S1 9.8 x 8.4 x 5.6 280 136,505 0.5941 0.0 0.0 1 MAY 2005
XV Atlas S/1980 S28 41 x 35 x 19 410 137,665 0.60169075 0.0012 0.003 OCT 1980
XVI Prometheus S/1980 S27 137 x 81 x 56 460 139,378 0.612986 0.0022 0.008 OCT 1980
XVII Pandora S/1980 S26 103 x 79 x 63 510 141,711 0.6285 0.0042 0.05 OCT 1980
XI Epimetheus S/1980 S3 130 x 116 x 107 625 151,410 0.6943 0.0098 0.351 14 DEC 1976
X Janus S/1966 S2 203 x 196 x 149 640 151,460 0.6947 0.0068 0.163 15 DEC 1966
LIII Aegaeon S/2008 S1 1.4 x 0.5 x 0.4 540 167,500 0.808 0.0 0.0 15 AUG 2008
I Mimas 413 x 391 x 381 1,148 185,539 0.942422 0.0196 1.572 18 JUL 1789
XXXII Methone S/2004 S1 3.9 x 2.6 x 2.4 310 194,440 1.009714 0.0001 0.0072 1 JUN 2004
XLIX Anthe S/2007 S4 2.3 x 1.7 540 197,700 1.0351 0.001 0.1 30 MAY 2007
XXXIII Pallene S/1981 S14 5.8 x 4.2 x 3.7 250 212,280 1.15375 0.004 0.181 1 JUN 2004
II Enceladus 512 x 503 x 497 1,610 238,037 1.370218 0.0047 0.009 28 AUG 1789
III Tethys 1,081 x 1,062 x 1,055 974 294,672 1.887802 0.0001 1.091 21 MAR 1684
XIII Telesto S/1980 S13 33 x 23 x 19 ? 294,710 1.887802 0.0002 1.18 8 APR 1980
XIV Calypso S/1980 S25 29 x 19 x 13 ? 294,710 1.887802 0.0005 1.499 13 MAR 1980
XXXIV Polydeuces S/2004 S5 3.0 x 2.6 x 2.0 ? 377,200 2.7369 0.0192 0.1774 21 OCT 2004
IV Dione 1,128 x 1,122 x 1,121 1,478 377,415 2.736915 0.0022 0.028 21 MAR 1684
XII Helene S/1980 S6 45 x 39 x 27 ? 377,420 2.7369 0.0071 0.213 1 MAR 1980
V Rhea 1,531 x 1,527 x 1,526 1,233 527,068 4.517500 0.001 0.331 23 DEC 1672
VI Titan 5,150 x 5,149 x 5,149 1,881 1,221,865 15.945421 0.0288 0.31 25 MAR 1655
VII Hyperion 360 x 266 x 205 540 1,500,934 21.276609 0.023 0.62 16 SEP 1848
VIII Iapetus 1,495 x 1,495 x 1,425 1,083 3,560,851 79.330183 0.0283 8.31 25 OCT 1671
XXIV Kiviuq S/2000 S5 22 x 10 ? 11,111,000 449.2 0.334 45.71 7 AUG 2000
XXII Ijiraq S/2000 S6 12 x 11 ? 11,124,000 451.4 0.316 46.44 23 SEP 2000
IX Phoebe 219 x 217 x 204 1,642 12,944,300 549.6 0.163 175.24 16 AUG 1898
XX Paaliaq S/2000 S2 21 x 20 ? 15,200,000 686.9 0.364 45.13 7 AUG 2000
XXVII Skathi S/2000 S8 8 x 6 ? 15,541,000 728.2 0.27 152.6 23 SEP 2000
S/2004 S37 4 ? 15,892,000 748 0.497 162.9 2004
XXVI Albiorix S/2000 S11 33 x 25 ? 16,182,000 783.5 0.478 33.98 9 NOV 2000
S/2007 S2 5 ? 16,560,000 800 0.218 176.7 30 MAY 2007
S/2004 S29 4 ? 16,981,000 826 0.440 45.1 2004
XXXVII Bebhionn S/2004 S11 7 x 5 ? 17,119,000 834.8 0.469 35.01 12 DEC 2004
XXVIII Erriapus S/2000 S10 11 x 8 ? 17,343,000 871.2 0.474 34.62 23 SEP 2000
XXIX Siarnaq S/2000 S3 42 x 36 ? 17,531,000 895.6 0.295 45.56 23 SEP 2000
S/2004 S31 4 ? 17,568,000 869 0.240 48.8 2004
XLVII Skoll S/2006 S8 5 x 4 ? 17,665,000 878.3 0.464 161.2 5 JAN 2006
XXI Tarvos S/2000 S4 15 x 14 ? 17,983,000 926.2 0.531 33.82 23 SEP 2000
LII Tarqeq S/2007 S1 7 x 5 ? 18,009,000 887.5 0.16 46.09 30 MAY 2007
LI Greip S/2006 S4 5 x 4 ? 18,206,000 921.2 0.326 179.8 5 JAN 2006
XLIV Hyrokkin S/2004 S19 8 x 7 ? 18,437,000 931.8 0.333 151.4 12 DEC 2004
S/2004 S13 5 ? 18,450,000 906 0.273 167.4 12 DEC 2004
S/2004 S17 3 ? 18,600,000 986 0.259 166.6 13 DEC 2004
XXV Mundilfari S/2000 S9 8 x 5 ? 18,685,000 952.6 0.21 167.3 23 SEP 2000
L Jarnsaxa S/2006 S6 4 ? 18,811,000 964.7 0.216 163.3 5 JAN 2006
S/2006 S1 4 ? 18,981,100 970 0.13 154.2 4 JAN 2006
XXXI Narvi S/2003 S1 6 ? 19,007,000 1,003.9 0.431 145.8 5 FEB 2003
XXXVIII Bergelmir S/2004 S15 5 ? 19,338,000 1,005.9 0.142 158.5 12 DEC 2004
S/2004 S20 4 ? 19,418,000 1,010 0.197 162.6 2004
XXIII Suttungr S/2000 S12 7 x 6 ? 19,459,000 1,016.7 0.114 175.8 23 SEP 2000
S/2004 S12 4 ? 19,650,000 1,048 0.401 164 12 DEC 2004
S/2004 S7 5 ? 19,800,000 1,103 0.58 165.1 12 DEC 2004
XLIII Hati S/2004 S14 6 x 4 ? 19,856,000 1,038.7 0.372 165.8 12 DEC 2004
S/2004 S27 5 ? 19,976,000 1,054 0.122 167.8 2004
XXXIX Bestla S/2004 S18 8 x 5 ? 20,129,000 1,083.6 0.521 145.2 13 DEC 2004
XL Farbauti S/2004 S9 4 ? 20,390,000 1,086.1 0.206 156.4 12 DEC 2004
XXX Thrymr S/2000 S7 7 x 6 ? 20,474,000 1,094.3 0.47 176 23 SEP 2000
S/2007 S3 4 ? 20,518,500 1,100 0.13 177.2 30 MAY 2007
S/2004 S22 3 ? 20,636,000 1,107 0.251 177.3 2004
S/2004 S30 5 ? 20,821,000 1,122 0.120 157.5 2004
XXXVI Aegir S/2004 S10 3 ? 20,735,000 1,116.5 0.252 166.7 12 DEC 2004
S/2006 S3 4 ? 21,132,000 1,142 0.471 150.8 5 JAN 2006
S/2004 S23 4 ? 21,163,000 1,149 0.373 177.0 2004
S/2004 S25 3 ? 21,174,000 1,150 0.442 173.0 2004
S/2004 S32 4 ? 21,214,000 1,154 0.250 159.1 2004
S/2004 S38 4 ? 21,908,000 1,211 0.437 154.1 2004
S/2004 S28 4 ? 22,020,000 1,220 0.143 170.3 2004
XLV Kari S/2006 S2 8 x 5 ? 22,118,000 1,233.6 0.478 156.3 4 JAN 2006
S/2004 S35 4 ? 22,412,000 1,253 0.184 176.4 2004
XLI Fenrir S/2004 S16 4 ? 22,453,000 1,260.3 0.136 164.9 13 DEC 2004
S/2004 S21 3 ? 22,645,000 1,272 0.318 156.0 2004
XLVIII Surtur S/2006 S7 4 ? 22,707,000 1,297.7 0.451 177.5 5 JAN 2006
S/2004 S24 4 ? 22,901,000 1,294 0.085 35.5 2004
XIX Ymir S/2000 S1 20 x 14 ? 23,040,000 1,315.4 0.335 173.1 7 AUG 2000
XLVI Loge S/2006 S5 5 x 4 ? 23,065,000 1,312 0.187 167.9 5 JAN 2006
S/2004 S36 3 ? 23,192,000 1,319 0.748 155.0 2004
S/2004 S39 3 ? 23,575,000 1,351 0.080 166.6 2004
S/2004 S33 4 ? 24,168,000 1,403 0.399 160.5 2004
S/2004 S34 3 ? 24,299,000 1,414 0.235 166.0 2004
XLII Fornjot S/2004 S8 5 x 4 ? 25,108,000 1,490.9 0.206 170.4 12 DEC 2004
S/2004 S26 4 ? 26,676,000 1,627 0.165 171.4 2004
Uranus VI Cordelia S/1986 U7 50 x 36 ? 49,800 0.335033 0.0003 0.085 20 JAN 1986
VII Ophelia S/1986 U8 54 x 38 ? 53,800 0.376404 0.0099 0.104 20 JAN 1986
VIII Bianca S/1986 U9 64 x 46 ? 59,166 0.434577 0.0009 0.18 23 JAN 1986
IX Cressida S/1986 U3 94 x 74 860 61,767 0.46357 0.0004 0.04 9 JAN 1986
X Desdemona S/1986 U6 90 x 54 ? 62,659 0.473651 0.0001 0.1 13 JAN 1986
XI Juliet S/1986 U2 150 x 74 ? 64,358 0.493066 0.0007 0.05 3 JAN 1986
XII Portia S/1986 U2 156 x 126 ? 66,097 0.513196 0.0001 0.03 3 JAN 1986
XIII Rosalind S/1986 U4 72 ? 69,926 0.558459 0.0001 0.09 13 JAN 1986
XXVII Cupid S/2003 U2 18 ? 74,392 0.618 0.001 0.1 25 AUG 2003
XIV Belinda S/1986 U5 128 x 64 ? 75,256 0.623525 0.0001 0.031 13 JAN 1986
XXV Perdita S/1986 U10 30 ? 76,417 0.638018 0.003 0.07 18 JAN 1986
XV Puck S/1985 U1 167 x 162 x 157 ? 86,004 0.761832 0.0001 0.319 30 DEC 1985
XXVI Mab S/2003 U1 25 ? 97,736 0.9229 0.003 0.13 25 AUG 2003
V Miranda 481 x 468 x 466 1,173 129,900 1.413479 0.0018 4.341 16 FEB 1948
I Ariel 1,162 x 1,156 x 1,155 1,540 190,900 2.520379 0.0012 0.042 24 OCT 1851
II Umbriel 1,169 1,523 266,000 4.1441772 0.004 0.133 24 OCT 1851
III Titania 1,578 1,714 436,300 8.705872 0.0012 0.08 11 JAN 1787
IV Oberon 1,523 1,630 583,500 13.463239 0.0013 0.069 11 JAN 1787
XXII Francisco S/2001 U3 18 ? 4,276,000 266.6 0.132 147.25 13 AUG 2001
XVI Caliban S/1997 U1 78 x 67 ? 7,231,000 579.7 0.181 141.53 6 SEP 1997
XX Stephano S/1999 U3 28 ? 8,004,000 677.4 0.225 143.82 18 JUL 1999
XXI Trinculo S/2001 U1 15 ? 8,504,000 759 0.219 166.97 13 AUG 2001
XVII Sycorax S/1997 U2 159 x 142 ? 12,179,000 1,288.30 0.522 159.42 6 SEP 1997
XXIII Margaret S/2003 U3 17 ? 14,345,000 1,694.80 0.677 57.37 29 AUG 2003
XVIII Prospero S/1999 U2 51 x 35 ? 16,256,000 1,977.30 0.445 151.83 18 JUL 1999
XIX Setebos S/1999 U1 45 x 35 ? 17,418,000 2,234.80 0.591 158.24 18 JUL 1999
XXIV Ferdinand S/2001 U2 22 x 14 ? 20,901,000 2,823.40 0.368 169.79 13 AUG 2001
Neptune III Naiad S/1989 N6 96 x 60 x 52 800 48,227 0.2943956 0.000328 4.7382 AUG 1989
IV Thalassa S/1989 N5 108 x 100 x 52 1,200 50,075 0.3114846 0.000156 0.2054 AUG 1989
V Despina S/1989 N3 180 x 148 x 128 ? 52,526 0.4287451 0.00012 0.07 JUL 1989
VI Galatea S/1989 N4 204 x 184 x 144 ? 61,953 0.3346552 0.000139 0.05 JUL 1989
VII Larissa S/1989 N2 216 x 204 x 168 ? 73,548 0.5546538 0.001386 0.2008 JUL 1989
XIV Hippocamp S/2004 N1 35 ? 105,284 0.936 0.0 0.0 JUL 2013
VIII Proteus S/1981 N1 440 x 416 x 404 ? 117,647 1.122316 0.000438 0.0392 JUN 1989
I Triton 2,709 x 2,706 x 2,705 2,060 354,759 5.876854 0.000016 156.87 10 OCT 1846
II Nereid 357 ? 5,513,818 360.6 0.7501 7.09 1 MAY 1949
IX Halimede S/2002 N1 61 ? 15,728,000 1,879.7 0.571 134.1 14 AUG 2002
XI Sao S/2002 N2 40 ? 22,422,000 2,914.1 0.293 48.51 14 AUG 2002
XII Laomedeia S/2002 N3 40 ? 23,571,000 3,167.9 0.424 34.74 13 AUG 2002
X Psamathe S/2003 N1 38 ? 46,695,000 9,115.9 0.45 137.4 29 AUG 2003
XIII Neso S/2002 N4 60 ? 48,387,000 9,374 0.495 132.6 14 AUG 2002
Pluto I Charon S/1978 P1 1,211 1,707 19,573 6.387227 0.0000 0.00 13 APR 1978
V Styx S/2012 (134340) 1 16 x 9 x 8 ? 42,490 20.1617 0.0034 0.08 26 JUN 2012
II Nix S/2005 P2 48 x 33 x 30 1,400 48,840 24.85494 0.0023 0.1 15 MAY 2005
IV Kerberos S/2011 (134340) 1 19 x 10 x 9 ? 57,730 32.16802 0.0031 0.426 28 JUN 2011
III Hydra S/2005 P1 50 x 36 x 32 1,200 64,740 38.20169 0.0066 0.304 15 MAY 2005
Haumea II Namaka S/2005 (2003 EL61) 2 160 ? 25,660 18.2783 0.249 13.41 26 JAN 2005
I Hi'iaka S/2005 (2003 EL61) 1 320 ? 49,880 49.462 0.051 0.0 30 JUN 2005
Makemake   S/2015 (136472) 1 175 ? 21,100 12.4 ? ? 27 APR 2015
(225088) 2007 OR10     220 ? 29,300 68 ? ? 18 SEP 2010
Eris I Dysnomia S/2005 (UB313) 1 700 ? 37,600 15.79 0.017 ? 10 SEP 2005

Note: for satellites with measurably non-spherical shapes, "diameter/dimensions" column gives axes of the best fit triaxial ellipsoid.

© 2001-2015, 2019 by Wm. Robert Johnston.
Last modified 3 November 2019.
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