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Planetary Satellite Mean Orbital Parameters
Select from satellites of Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto

 WARNING: These mean orbital parameters are not intended for ephemeris computation. Accurate ephemerides should be obtained from our HORIZONS system. Mean orbital parameters are primarily useful in describing the general shape and orientation of a planetary satellite's orbit.

Satellites of Earth jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean ecliptic orbital elements

Epoch 2000 Jan. 1.50 TT
Solution: DE405/LE405
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Moon 384400. 0.0554 318.15 135.27 5.16 125.08 13.176358 27.322 5.997 18.600 1

Satellites of Mars jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean orbital elements referred to the local Laplace planes

Epoch 1950 Jan. 1.00 TT
Solution: MAR080
 Sat. Ref. a e w M i node n P Pw Pnode R.A. Dec. Tilt (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) (deg) (deg) (deg) Phobos 9376. 0.0151 150.057 91.059 1.075 207.784 1128.8447569 0.3189 1.1316 2.2617 317.671 52.893 0.009 5 Deimos 23458. 0.0002 260.729 325.329 1.788 24.525 285.1618790 1.2624 27.3703 54.5367 316.657 53.529 0.889 5

Satellites of Jupiter jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean orbital elements referred to the local Laplace planes

Epoch 1997 Jan. 16.00 TT

 Sat. Ref. a e w M i node n P Pw Pnode R.A. Dec. Tilt (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) (deg) (deg) (deg) Io 421800. 0.0041 84.129 342.021 0.036 43.977 203.4889583 1.769 1.625 7.420 268.057 64.495 0.000 11 Europa 671100. 0.0094 88.970 171.016 0.466 219.106 101.3747242 3.551 1.394 30.184 268.084 64.506 0.016 11 Ganymede 1070400. 0.0013 192.417 317.540 0.177 63.552 50.3176072 7.155 63.549 132.654 268.168 64.543 0.068 11 Callisto 1882700. 0.0074 52.643 181.408 0.192 298.848 21.5710728 16.69 205.75 338.82 268.639 64.749 0.356 11 Amalthea 181400. 0.0032 155.873 185.194 0.380 108.946 722.6317143 0.498 0.196 0.393 268.057 64.495 0.000 11 Thebe 221900. 0.0176 234.269 135.956 1.080 235.694 533.7002568 0.675 0.398 0.797 268.057 64.495 0.000 11 Adrastea 129000. 0.0018 328.047 135.673 0.054 228.378 1206.9988064 0.298 0.058 0.116 268.057 64.496 0.000 11 Metis 128000. 0.0012 297.177 276.047 0.019 146.912 1221.2545982 0.295 0.057 0.115 268.057 64.496 0.000 11

### Ecliptic mean orbital elements

Epoch 2000 Jan. 1.00 TT
Solution: Ecliptic mean elements - JUP300
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Himalia 11460000. 0.1586 331.234 66.874 28.612 64.798 1.4367562 250.56 139.38 292.57 18 Elara 11740000. 0.2108 142.001 330.985 27.945 115.511 1.3865315 259.64 128.07 265.30 18 Pasiphae 23629000. 0.4062 169.226 279.769 151.413 314.223 0.4841223 743.61 81.20 81.17 18 Sinope 23942000. 0.2552 354.541 165.352 158.189 309.199 0.4743772 758.89 88.72 87.40 18 Lysithea 11717000. 0.1161 49.670 330.475 27.663 5.326 1.3888891 259.20 131.19 292.04 18 Carme 23401000. 0.2546 26.416 233.375 164.994 114.854 0.4903501 734.17 80.98 88.32 18 Ananke 21254000. 0.2332 95.772 253.384 148.693 15.959 0.5716125 629.80 144.92 110.12 18 Leda 11164000. 0.1624 269.393 230.352 27.882 219.181 1.4942407 240.93 144.79 301.94 18 Callirrhoe 24099000. 0.2796 23.909 107.962 147.080 283.104 0.4744232 758.82 120.06 89.03 18 Themisto 7504000. 0.2435 217.147 313.051 42.977 192.288 2.7688033 130.02 686.41 528.39 18 Megaclite 23814000. 0.4156 288.882 135.272 152.781 280.575 0.4781658 752.88 76.90 79.23 18 Taygete 23363000. 0.2523 231.540 94.756 165.253 305.114 0.4915209 732.42 81.04 88.59 18 Chaldene 23181000. 0.2503 243.878 267.454 165.155 134.240 0.4974208 723.73 81.66 89.52 18 Harpalyke 21106000. 0.2296 134.505 215.956 148.759 29.834 0.5775515 623.32 147.17 111.64 18 Kalyke 23565000. 0.2466 218.934 255.702 165.121 43.864 0.4851490 742.04 80.76 87.67 18 Iocaste 21272000. 0.2152 64.727 213.675 149.411 269.613 0.5699784 631.60 145.78 111.18 18 Erinome 23286000. 0.2655 10.274 267.136 164.914 317.497 0.4941719 728.49 80.51 88.33 18 Isonoe 23231000. 0.2471 116.879 124.941 165.250 130.961 0.4956884 726.26 81.80 89.52 18 Praxidike 21148000. 0.2274 190.862 117.480 148.885 280.956 0.5756381 625.39 144.77 111.16 18 Autonoe 24037000. 0.3152 54.793 142.035 152.364 272.817 0.4730563 761.01 92.33 85.00 18 Thyone 21197000. 0.2307 97.023 238.786 148.595 233.022 0.5739872 627.19 147.58 110.93 18 Hermippe 21297000. 0.2095 300.836 131.854 150.740 330.393 0.5679040 633.91 136.92 110.64 18 Aitne 23317000. 0.2627 99.401 105.000 165.048 8.679 0.4930702 730.12 80.36 88.19 18 Eurydome 23146000. 0.2755 223.631 287.689 150.271 302.470 0.5018735 717.31 111.58 93.30 18 Euanthe 21039000. 0.2320 320.635 333.101 148.915 254.297 0.5802269 620.45 144.52 111.71 18 Euporie 19336000. 0.1438 89.904 70.243 145.740 60.143 0.6537221 550.69 337063.88 139.45 18 Orthosie 21158000. 0.2807 216.805 204.517 146.004 221.949 0.5782402 622.58 142.35 107.53 18 Sponde 23790000. 0.3112 61.885 174.044 150.997 116.363 0.4810760 748.32 98.08 87.01 18 Kale 23306000. 0.2597 44.233 212.853 164.944 60.170 0.4934152 729.61 80.91 88.57 18 Pasithee 23091000. 0.2682 231.920 215.443 165.117 327.729 0.5003695 719.47 80.82 89.25 18 Hegemone 23575000. 0.3445 197.144 236.950 154.164 318.902 0.4866038 739.82 85.66 84.87 18 Mneme 21033000. 0.2258 40.542 256.860 148.585 13.467 0.5806001 620.05 148.06 112.26 18 Aoede 23974000. 0.4325 59.739 197.676 158.272 173.392 0.4728089 761.41 69.17 76.83 18 Thelxinoe 21160000. 0.2201 313.183 268.013 151.390 169.962 0.5732248 628.03 130.58 110.42 18 Arche 23352000. 0.2495 171.632 39.713 165.015 339.210 0.4918707 731.90 81.40 88.73 18 Kallichore 23276000. 0.2509 9.836 55.937 165.102 30.339 0.4943462 728.23 81.56 89.16 18 Helike 21065000. 0.1498 299.482 43.659 154.842 89.749 0.5747808 626.33 127.40 114.52 18 Carpo 17056000. 0.4317 90.372 337.062 51.624 50.597 0.7889862 456.28 711550.25 112.82 18 Eukelade 23323000. 0.2619 309.685 204.846 165.265 193.558 0.4929260 730.33 80.24 88.16 18 Cyllene 23800000. 0.4155 187.429 128.345 150.336 252.611 0.4787365 751.98 80.19 79.71 18 Kore 24482000. 0.3313 138.071 33.416 145.173 313.355 0.4634134 776.84 108.39 84.47 18 Herse 23408000. 0.2541 330.295 141.667 164.964 295.702 0.4901154 734.52 80.98 88.27 18 S/2000 J 11 12297000. 0.2320 173.544 309.734 28.631 294.497 1.2939791 278.21 117.58 241.93 18 S/2003 J 2 28347000. 0.4100 165.201 237.932 157.291 344.782 0.3671484 980.53 60.25 62.87 18 S/2003 J 3 20221000. 0.1969 66.338 311.780 147.547 231.489 0.6165779 583.87 181.96 122.74 18 S/2003 J 4 23929000. 0.3624 197.401 260.480 149.589 179.131 0.4766663 755.25 90.17 82.96 18 S/2003 J 5 23495000. 0.2476 90.066 336.636 165.248 176.683 0.4873118 738.75 80.95 88.10 18 S/2003 J 9 23385000. 0.2632 292.662 348.415 165.047 44.321 0.4909185 733.32 80.27 87.93 18 S/2003 J 10 23042000. 0.4299 170.833 258.937 165.073 151.911 0.5026172 716.25 68.06 80.34 18 S/2003 J 12 17830000. 0.4904 13.288 38.543 151.003 65.530 0.7351860 489.67 97.93 109.42 18 S/2003 J 15 22627000. 0.1899 18.405 58.865 146.492 236.674 0.5219082 689.78 187.83 105.37 18 S/2003 J 16 21097000. 0.2281 57.681 307.563 148.683 16.883 0.5779589 622.88 146.70 111.64 18 S/2003 J 18 20508000. 0.0895 130.894 202.160 146.077 158.247 0.6018719 598.13 506.86 131.88 18 S/2003 J 19 23533000. 0.2552 176.668 223.035 165.116 27.442 0.4862156 740.41 80.17 87.39 18 S/2003 J 23 23567000. 0.2746 255.114 144.222 146.424 41.706 0.4914942 732.46 130.10 92.90 18 S/2010 J 1 23449000. 0.2491 189.230 160.525 165.100 282.871 0.4887995 736.50 81.18 88.33 18 S/2010 J 2 21004000. 0.2267 18.252 312.074 148.673 5.802 0.5817371 618.84 147.06 112.35 18 S/2011 J 1 23446000. 0.2534 31.514 256.027 165.318 250.728 0.4888998 736.35 80.45 87.91 18 S/2011 J 2 23124000. 0.3493 270.154 285.597 153.597 24.866 0.5011321 718.37 87.78 87.00 18

Satellites of Saturn jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean orbital elements referred to the local Laplace planes

Epoch 2000 Jan. 1.50 TT

 Sat. Ref. a e w M i node n P Pw Pnode R.A. Dec. Tilt (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) (deg) (deg) (deg) Mimas 185539. 0.0196 332.499 14.848 1.574 173.027 381.9944948 0.942 0.493 0.986 40.589 83.536 0.002 32 Enceladus 238042. 0.0000 0.076 199.686 0.003 342.507 262.7318978 1.370 1.184 2.360 40.586 83.536 0.002 32 Tethys 294672. 0.0001 45.202 243.367 1.091 259.842 190.6979109 1.888 2.490 4.982 40.578 83.537 0.001 32 Dione 377415. 0.0022 284.315 322.232 0.028 290.415 131.5349307 2.737 5.852 11.709 40.544 83.540 0.005 32 Rhea 527068. 0.0002 241.619 179.781 0.333 351.042 79.6900459 4.518 17.939 35.832 40.328 83.559 0.036 32 Titan 1221865. 0.0288 180.532 163.310 0.306 28.060 22.5769756 15.95 352.12 704.60 36.214 83.949 0.629 32 Hyperion 1500933. 0.0232 303.178 86.342 0.615 263.847 16.9199503 21.28 127.99 154.66 36.372 83.862 0.564 32 Iapetus 3560854. 0.0293 271.606 201.789 8.298 81.105 4.5379416 79.33 1676.69 3438.73 284.715 78.749 15.210 32 Phoebe 12947918. 0.1634 342.500 53.038 175.243 241.086 0.6569114 548.02 460.92 723.17 275.954 67.455 26.723 32 Janus 151450. 0.0098 16.012 17.342 0.165 154.175 518.3431513 0.695 0.240 0.482 40.585 83.538 0.000 33 Epimetheus 151450. 0.0161 88.975 80.377 0.353 192.762 518.0979676 0.695 0.240 0.482 40.585 83.538 0.000 33 Helene 377444. 0.0000 33.134 43.186 0.213 163.112 131.5349306 2.737 2.562 11.706 40.544 83.540 0.005 32 Telesto 294720. 0.0002 119.135 260.157 1.180 229.182 190.6979089 1.888 2.489 4.982 40.578 83.537 0.001 32 Calypso 294721. 0.0005 17.470 156.660 1.500 314.226 190.6979089 1.888 2.487 4.983 40.578 83.537 0.001 32 Atlas 137774. 0.0011 210.851 283.282 0.003 236.422 598.3147505 0.602 0.171 0.344 40.585 83.538 0.000 33 Prometheus 139429. 0.0022 37.514 96.886 0.007 319.176 587.2860142 0.613 0.179 0.359 40.585 83.538 0.000 33 Pandora 141810. 0.0042 66.248 125.112 0.050 147.272 572.7878754 0.629 0.190 0.381 40.585 83.538 0.000 33 Pan 133585. 0.0000 103.331 351.187 0.000 52.076 626.0317341 0.575 0.154 0.309 40.583 83.538 0.000 33 Methone 194402. 0.0000 134.636 71.189 0.013 313.562 356.5949252 1.010 0.250 1.158 40.589 83.536 0.002 32 Pallene 212282. 0.0040 16.074 356.229 0.001 123.180 312.0270737 1.154 0.862 1.899 40.579 83.537 0.001 33 Polydeuces 377222. 0.0191 311.847 89.307 0.175 67.936 131.5349306 2.737 5.811 11.695 40.543 83.540 0.005 33 Daphnis 136504. 0.0000 266.931 113.790 0.003 132.867 605.9791512 0.594 0.166 0.334 40.583 83.538 0.000 33 Anthe 196888. 0.0011 138.902 190.473 0.015 287.852 347.3587167 1.036 0.617 1.232 40.583 83.537 0.000 33 Aegaeon 167425. 0.0002 152.905 322.771 0.001 317.202 445.4934177 0.808 0.343 0.688 40.584 83.537 0.001 33

### Mean ecliptic orbital elements

Epoch 2000 Jan. 1.00 TT

 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Ymir 23128000. 0.3338 21.352 228.673 173.497 192.937 0.2737369 1315.13 217.61 277.53 34 Paaliaq 15204000. 0.3325 237.522 321.654 46.228 330.022 0.5240567 686.95 576.14 535.71 34 Tarvos 18243000. 0.5382 274.104 265.783 33.725 102.504 0.3886226 926.35 194.18 272.97 34 Ijiraq 11408000. 0.2717 92.899 17.328 47.485 130.779 0.7974868 451.42 13807.37 935.12 34 Suttungr 19468000. 0.1139 34.281 321.133 175.815 227.259 0.3540952 1016.68 292.79 402.20 34 Kiviuq 11384000. 0.3325 90.205 172.018 46.764 353.584 0.8013951 449.22 19973.94 840.86 34 Mundilfari 18653000. 0.2097 309.694 92.821 167.439 82.856 0.3778328 952.80 312.23 417.31 34 Albiorix 16393000. 0.4797 55.932 32.828 34.060 102.512 0.4595027 783.46 249.88 358.14 34 Skathi 15635000. 0.2718 203.517 114.689 152.633 286.599 0.4944382 728.10 474.36 546.69 34 Erriapus 17602000. 0.4722 282.522 294.829 34.481 150.985 0.4132539 871.14 219.90 323.49 34 Siarnaq 18182000. 0.2802 65.929 201.288 45.809 47.826 0.4020067 895.51 457.40 454.20 34 Thrymr 20418000. 0.4659 125.404 30.075 177.659 285.762 0.3296678 1092.01 875.11 139002.09 34 Narvi 19349000. 0.4296 169.959 114.172 145.731 174.435 0.3585873 1003.94 341.38 347.42 34 Aegir 20751000. 0.2524 242.651 26.017 166.668 179.064 0.3220526 1117.83 273.91 350.18 34 Bebhionn 17116000. 0.4682 358.141 168.045 35.101 199.128 0.4312114 834.86 236.57 342.06 34 Bergelmir 19336000. 0.1420 133.400 306.494 158.557 202.164 0.3579396 1005.76 359.70 424.95 34 Bestla 20209000. 0.5145 81.185 239.156 145.136 288.308 0.3308757 1088.02 284.99 299.08 34 Farbauti 20390000. 0.2414 342.995 282.813 156.520 135.109 0.3312924 1086.65 330.77 374.34 34 Fenrir 22454000. 0.1347 120.982 131.678 164.963 226.595 0.2856343 1260.35 276.77 332.99 34 Fornjot 25146000. 0.2077 324.787 214.499 170.372 259.946 0.2409497 1494.09 223.68 267.44 34 Hati 19868000. 0.3710 21.286 163.640 165.808 324.380 0.3460954 1040.18 262.48 339.97 34 Hyrrokkin 18440000. 0.3359 273.076 291.841 151.536 45.402 0.3863203 931.87 375.76 406.45 34 Kari 22093000. 0.4756 163.935 286.021 156.067 281.211 0.2924012 1231.18 228.81 270.06 34 Loge 23059000. 0.1862 32.821 337.237 167.689 343.811 0.2745228 1311.37 251.72 307.35 34 Skoll 17668000. 0.4636 193.115 44.965 161.010 296.623 0.4099120 878.24 286.68 369.06 34 Surtur 22941000. 0.4459 303.662 136.191 169.688 236.537 0.2775384 1297.12 202.95 259.66 34 Jarnsaxa 19354000. 0.2178 237.422 198.750 163.649 22.519 0.3575194 1006.94 312.48 396.92 34 Greip 18457000. 0.3146 152.160 314.541 174.800 349.350 0.3841491 937.14 280.23 385.90 34 Tarqeq 17962000. 0.1675 34.767 161.020 46.291 83.291 0.4067094 885.15 896.54 593.15 34 S/2004 S 7 21000000. 0.5290 84.036 79.762 165.693 341.236 0.3157314 1140.21 211.18 273.22 34 S/2004 S 12 19886000. 0.3268 87.128 1.599 165.261 307.942 0.3441326 1046.11 273.22 351.49 34 S/2004 S 13 18406000. 0.2591 346.186 41.077 168.798 205.701 0.3856043 933.60 302.01 409.39 34 S/2004 S 17 19448000. 0.1795 180.792 228.545 168.239 26.664 0.3548169 1014.61 300.99 397.14 34 S/2006 S 1 18780000. 0.1412 154.950 96.596 156.180 336.641 0.3741294 962.23 405.14 453.57 34 S/2006 S 3 22428000. 0.3792 188.728 167.147 158.631 206.993 0.2868177 1255.15 245.54 287.39 34 S/2007 S 2 16718000. 0.1791 57.720 84.066 174.057 111.277 0.4454603 808.15 342.95 496.45 34 S/2007 S 3 18938000. 0.1853 111.854 292.691 177.595 276.824 0.3681825 977.78 1079.63 161352.07 34

Satellites of Uranus jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean equatorial orbital elements

Epoch 1980 Jan. 1.0 TT
Solution: GUST86 - Laskar and Jacobson (1987) A&A 188, pp. 212-224 (converted to ICRF)
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Ariel 190900. 0.0012 115.349 39.481 0.041 22.394 142.8356579 2.520 28.788 57.248 10 Umbriel 266000. 0.0039 84.709 12.469 0.128 33.485 86.8688879 4.144 63.146 126.951 10 Titania 436300. 0.0011 284.400 24.614 0.079 99.771 41.3514246 8.706 161.525 195.369 10 Oberon 583500. 0.0014 104.400 283.088 0.068 279.771 26.7394888 13.46 161.52 195.37 10 Miranda 129900. 0.0013 68.312 311.330 4.338 326.438 254.6906576 1.413 8.913 17.727 10

### Mean equatorial orbital elements

Epoch 1986 Jan. 19.50 TT
Solution: URA039 - Jacobson (1998) AJ 115, pp. 1195-1199
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Cordelia 49800. 0.0003 136.827 254.805 0.085 38.374 1074.5183162 0.335 0.328 0.657 9 Ophelia 53800. 0.0099 17.761 116.259 0.104 164.048 956.4283330 0.376 0.431 0.862 9 Bianca 59200. 0.0009 8.293 138.486 0.193 93.220 828.3879607 0.435 0.603 1.206 9 Cressida 61800. 0.0004 44.236 233.795 0.006 99.403 776.5824144 0.464 0.701 1.402 9 Desdemona 62700. 0.0001 183.285 184.627 0.113 306.089 760.0555393 0.474 0.737 1.474 9 Juliet 64400. 0.0007 223.819 244.696 0.065 200.155 730.1261349 0.493 0.809 1.619 9 Portia 66100. 0.0001 222.433 218.312 0.059 260.067 701.4864814 0.513 0.888 1.777 9 Rosalind 69900. 0.0001 140.477 136.181 0.279 12.847 644.6304183 0.558 1.081 2.163 9 Belinda 75300. 0.0001 42.406 357.224 0.031 279.337 577.3602885 0.624 1.397 2.796 9 Puck 86000. 0.0001 177.094 245.796 0.319 268.734 472.5445878 0.762 2.224 4.448 9

### Mean equatorial orbital elements

Epoch 2004 Aug. 25.50 TT
Solution: Showalter (2006) Science, 311, 973
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Perdita 76417. 0.0116 253.925 192.405 0.470 309.376 564.2469590 0.638 1.479 2.958 51 Mab 97736. 0.0025 249.565 273.769 0.134 350.737 390.0501070 0.923 3.502 7.004 51 Cupid 74392. 0.0013 247.608 163.830 0.099 182.793 587.4436490 0.613 1.346 2.693 51

### Mean orbital elements referred to the Ecliptic

Epoch 2000 Jan. 1.50 TT
Solution: URA090
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Caliban 7231100. 0.1812 354.339 7.271 141.529 171.189 0.6209758 579.73 8936.31 6445.52 16 Sycorax 12179400. 0.5219 20.103 266.583 159.420 263.034 0.2794217 1288.38 1393.43 1863.29 16 Prospero 16276800. 0.4445 174.152 233.586 151.830 319.003 0.1819679 1978.37 1155.47 1370.39 16 Setebos 17420400. 0.5908 359.953 179.449 158.235 250.235 0.1617921 2225.08 823.91 1044.20 16 Stephano 8007400. 0.2248 14.956 270.163 143.819 191.411 0.5313866 677.47 5484.23 5182.20 16 Trinculo 8505200. 0.2194 158.688 180.374 166.971 193.755 0.4803847 749.40 2592.77 4273.04 16 Francisco 4282900. 0.1324 140.644 3.202 147.250 100.738 1.3478663 267.09 12574.36 14080.40 16 Margaret 14146700. 0.6772 90.017 322.187 57.367 7.067 0.2167366 1661.00 12057739.22 987.08 16 Ferdinand 20430000. 0.3993 156.298 26.163 169.793 217.350 0.1290311 2790.03 747.30 1001.70 16

Satellites of Neptune jump to: Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto or [top of page]

### Mean orbital elements referred to the local Laplace planes

Epoch 2000 Jan. 1.50 TT

 Sat. Ref. a e w M i node n P Pw Pnode R.A. Dec. Tilt (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) (deg) (deg) (deg) Triton 354759. 0.0000 66.142 352.257 156.865 177.608 61.2572638 5.877 386.371 687.446 299.456 43.414 0.010 54 Nereid 5513818. 0.7507 281.117 216.692 7.090 335.570 0.9996276 360.13 8091.45 9455.73 269.302 69.117 30.011 54

### Mean orbital elements referred to the local Laplace planes

Epoch 2000 Jan. 1.50 TDT
Solution: Voyager, HST, and Astrometric data solution
 Sat. Ref. a e w M i node n P Pw Pnode R.A. Dec. Tilt (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) (deg) (deg) (deg) Naiad 48227. 0.0003 2.045 30.035 4.691 42.279 1222.8435847 0.294 0.289 0.575 299.431 42.940 0.448 55 Thalassa 50074. 0.0002 237.065 262.923 0.135 145.980 1155.7559749 0.311 0.327 0.654 299.431 42.939 0.449 55 Despina 52526. 0.0002 176.857 230.812 0.068 77.060 1075.7330674 0.335 0.387 0.774 299.431 42.937 0.451 55 Galatea 61953. 0.0001 343.011 65.999 0.034 37.247 839.6613030 0.429 0.690 1.380 299.430 42.925 0.462 55 Larissa 73548. 0.0014 249.891 166.246 0.205 308.127 649.0540770 0.555 1.257 2.516 299.429 42.897 0.490 55 Proteus 117646. 0.0005 67.968 250.938 0.075 315.131 320.7656245 1.122 6.380 12.727 299.406 42.432 0.974 54 S/2004 N 1 105284. 0.0000 0.000 302.652 0.000 0.000 378.9061402 0.950 0.000 0.000 299.373 42.944 0.448 57

### Mean ecliptic orbital elements

Epoch 2003 Jun. 10.00 TT

 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Halimede 16681000. 0.2909 162.119 105.258 112.898 217.288 0.1915578 1879.33 5673.19 18501.48 56 Psamathe 46705000. 0.4617 144.158 190.027 137.679 298.074 0.0394359 9128.74 1477.62 1304.72 56 Sao 22619000. 0.2827 65.047 168.139 49.907 60.354 0.1233230 2919.16 436880.78 5382.39 56 Laomedeia 23613000. 0.4339 140.107 285.863 34.049 59.124 0.1133637 3175.62 2245.08 3325.44 56 Neso 50258000. 0.4243 86.441 260.648 131.265 49.151 0.0364349 9880.63 23936.86 1094.07 56

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### Mean equatorial (IAU equator) orbital elements, planetocentric for Charon, barycentric for the others

Solution: PLU042
 Sat. Ref. a e w M i node n P Pw Pnode (km) (deg) (deg) (deg) (deg) (deg/day) (days) (yr) (yr) Charon 19591. 0.0002 146.106 131.070 0.080 26.928 56.3625210 6.387 10178.040 9020.398 58 Nix 48671. 0.0000 324.463 284.405 0.000 203.400 14.4841304 24.85 0.000 0.000 58 Hydra 64698. 0.0056 153.307 326.678 0.304 113.173 9.4235386 38.20 7.19 14.35 58 Kerberos 57729. 0.0000 160.629 161.061 0.426 305.871 11.1913026 32.17 0.000 9.27 58 Styx 42393. 0.0006 330.244 194.546 0.080 26.956 17.8551357 20.16 3710.58 5162.64 58

a Semi-major Axis (mean value) Eccentricity (mean value) Argument of periapsis (mean value) Mean anomaly (mean value) Inclination with respect to the reference plane: ecliptic, ICRF, or local Laplace (mean value) Longitude of the ascending node (mean value) measured from the node of the reference plane on the ICRF equator Longitude rate (mean value) Sidereal period (mean value) Argument of periapsis precession period (mean value) Longitude of the ascending node precession period (mean value)

R.A.Dec. Right ascension and ...Declination of the Laplace plane pole with respect to the ICRF. The angle between the planet equator and the Laplace plane.

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2. Jacobson, R.A. (2003) ``Reconstruction of the Voyager Saturn Encounter Orbits in the ICRF System'', Paper No. AAS 03-198, 13th AAS/AIAA Space Flight Mechanics Meeting, Ponce, Puerto Rico.

3. Jacobson, R.A. (2000) ``The orbits of the outer Jovian satellites'', Astronomical Journal 120, 2679-2686. Note: the mean motions and periods appearing in the reference are incorrect for the retrograde satellites. The correct values appear here.

4. Jacobson, R.A., Riedel, J.E. and Taylor, A.H. (1991) ``The orbits of Triton and Nereid from spacecraft and Earthbased observations'', Astronomy & Astrophysics 247, 565.

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6. Jacobson, R.A. (1996) ``Orbits of the Saturnian Satellites from Earthbased and Voyager Observations'', Bull. American Astronomical Society 28(3), 1185.

7. Jacobson, R.A. (1997) JUP120 - JPL satellite ephemeris.

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9. Jacobson, R.A. (1998) ``The orbits of the inner Uranian satellites from Hubble Space Telescope and Voyager 2 observations'', Astronomical Journal 115, 1195.

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11. Jacobson, R.A. (2003) JUP230 - JPL satellite ephemeris.

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13. Tholen, D .J. and Buie, M. W. (1990) ``Further Analysis of Pluto-Charon Mutual Event Observations'',Bull. American Astronomical Society 22(3), 1129.

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17. Jacobson, R.A. (2000) URA047 - JPL satellite ephemeris.

18. Jacobson, R.A. (2013) JUP300 - JPL satellite ephemeris for the irregular Jovian satellites.

19. Jacobson, R.A. (2004) ``The orbits of the major Saturnian satellites and the gravity field of Saturn from spacecraft and Earthbased observations'',Astronomical Journal 128, 492.

20. Jacobson, R.A. (2001c) ``The Orbits of Jupiter and its Galilean Satellites and the Gravity Field of the Jovian System'', Jupiter: The Planet, Satellites, and Magnetosphere, Boulder, Colorado.

21. Jacobson, R.A. (2001d) ``The Gravity Field of the Jovian System and the Orbits of the Regular Jovian Satellites'', 33rd Annual Meeting of the Division for Planetary Sciences, New Orleans, Louisiana.

22. Jacobson, R.A. (2009) JUP269 - JPL satellite ephemeris.

23. Lieske, J.H. (1998) ``Galilean satellite ephemerides E5'', Astronomy & Astrophysics Supp. 129, 205.

24. Jacobson, R.A. (2003) URA066 - JPL satellite ephemeris.

25. Jacobson, R.A. (2002) JUP242 - JPL satellite ephemeris.

26. Jacobson, R.A. (2003) JUP219 - JPL satellite ephemeris.

27. Jacobson, R.A. (2003) NEP029 - JPL satellite ephemeris.

28. Jacobson, R.A. (2003) JUP222 - JPL satellite ephemeris.

29. Jacobson, R.A. (2003) JUP224 - JPL satellite ephemeris.

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32. Jacobson, R.A. (2010) SAT339 - JPL satellite ephemeris.

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34. Jacobson, R.A. (2013) SAT361 - JPL satellite ephemeris.

35. Jacobson, R.A. (2004) JUP252 - JPL satellite ephemeris

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37. Jacobson, R.A. (2003) URA067 - JPL satellite ephemeris

38. Jacobson, R.A. (2007) NEP057 - JPL satellite ephemeris

39. Jacobson, R.A. (2003) URA068 - JPL satellite ephemeris

40. Jacobson, R.A. (2003) URA072 - JPL satellite ephemeris

41. Jacobson, R.A. (2009) SAT317 - JPL satellite ephemeris.

42. Jacobson, R.A. (2006) JUP261 - JPL satellite ephemeris.

43. Jacobson, R.A. (2009) JUP268 - JPL satellite ephemeris.

44. Jacobson, R.A. (2009) JUP270 - JPL satellite ephemeris.

45. Jacobson, R. A. and Owen, Jr., W. M. (2004) ``The orbits of the inner Neptunian satellites from Voyager, Earthbased, and Hubble Space Telescope observations'', Astronomical Journal 128, 1412.

46. Jacobson, R. A. and French, R. G. (2004) ``Orbits and Masses of Saturn's Coorbital and F-ring Shepherding Satellites'', Icarus 172, 382.

47. Spitale, J. N., Jacobson, R. A., Porco, C. C., and Owen, Jr., W. M. (2006) ``The Orbits of Saturn's Small Satellites Derived from Combined Historic and Cassini Imaging Observations'', Astronomical Journal 132, 692.

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49. Jacobson, R.A. (2008) SAT295 - JPL satellite ephemeris.

50. Jacobson, R.A. (2008) SAT296 - JPL satellite ephemeris.

51. Showalter, M. R. and Lissauer, J. J. (2006) ``The Second Ring-Moon System of Uranus: Discovery and Dynamics'', Science 311, 973.

52. Jacobson, R.A. (2008) SAT297 - JPL satellite ephemeris.

53. Jacobson, R.A. (2008) SAT298 - JPL satellite ephemeris.

54. Jacobson, R. A. (2009) ``The Orbits of the Neptunian Satellites and the Orientation of the Pole of Neptune'', Astronomical Journal 137, 4322.

55. Jacobson, R.A. (2008) NEP077 - JPL satellite ephemeris.

56.Brozovic, M., Jacobson, R. A., and Sheppard, S. S. (2011) ``The Orbits of the Outer Neptunian Satellites'', Astronomical Journal 141, 135.

57. Jacobson, R.A. (2013) NEP087 - JPL satellite ephemeris.

58. Brozovic, M. and Jacobson, R. A. (2013) ``The Orbits, Masses of Pluto's Satellites'', Presented at The Pluto System on the Eve of Exploration by New Horizons: Perspectives, Predictions held at APL, Laurel, MD - PLU042 - JPL satellite ephemeris.

2016-May-05 10:23 UT
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