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Solar system planets data

Mercury

Mercury/Earth comparison

Bulk parameters Mercury Ratio Mercury/Earth
Mass (10^24 Kg) 0.3302 0.055
Equatorial radius (Km) 2439 0.382
Polar radius (Km) 2439 0.384
Ellipticity 0.000 0.0000
Average density (Kg/m^3) 5427 0.983
Surface gravity (eq.)(m/s^2) 3.70 0.378
Escape velocity (Km/s) 4.3 0.384
Visual magnitude V(1.0) -0.42 -
Solar irradiance (W/m^2) 3566 2.584
Moment of inertia 0.33 0.998
 
Orbital parameters Mercury Ratio Mercury/Earth
Semimajor axis (10^6 Km) 57.9 0.387
Sidereal revolution period (days) 87.969 0.241
Tropical revolution (days) 87.968 0.241
Synodic period (days) 115.88 -
Mean orbital velocity (Km/s) 47.89 1.6076
Orbit inclination (degrees) 7.00 -
Eccentricity 0.2056 12.311
Sidereal rotation period (hours) 1407.6 58.785
Obliquity (degrees) 0.0 0.0000
 
Mercurian magnetosphere  
Dipole field force 0.0033 gauss-Rm^3
Dipole tilt to rotational axis 169 degrees
Note: Rm denotes Mercurian radius (2439 Km)

Venus

Venus/Earth comparison

Bulk parameters Venus Ratio Venus/Earth
Mass (10^24 Kg) 4.869 0.815
Equatorial radius (Km) 6052 0.949
Polar radius (Km) 6052 0.952
Ellipticity 0.000 0.0
Mean density (Kg/m^3) 5204 0.943
Surface gravity (eq.) (m/s^2) 8.87 0.907
Escape velocity (Km/s) 10.36 0.926
Visual magnitude V(1.0) -4.40 -
Solar irradiance (W/m^2) 2660 1.928
Topographic range (Km) 15 0.750
Moment of inertia 0.33 0.998
 
Orbital parameters Venus Ratio Venus/Earth
Semimajor axis (10^6 Km) 108.2 0.723
Sidereal orbit period (days) 224.701 0.615
Tropical orbit period (days) 224.695 0.615
Synodic period (days) 583.92 -
Mean orbital velocity (Km/s) 35.02 1.176
Orbit inclination (degrees) 3.4 -
Eccentricity 0.0068 0.407
Sidereal rotation period (hours) 5832.5 243.7
Obliquity (degrees) 177.3 (0.115)
 
Atmosphere of Venus  
Pressure in surface 92 bars
Scale height 15 km
Average temperature 737 K
Diurnal temperature range ~0
Wind speeds 0.3 à 1.0 m/s (surface)
Atmospheric composition 96% Carbon dioxide, 3% Nitrogen

Earth

Bulk parameters  
Mass (10^24 Kg) 5.975
Equatorial radius (Km) 6378
Polar radius (Km) 6356
Core radius (Km) 3485
Ellipticity 0.0034
Mean density (Kg/m^3) 5520
Surface gravity (m/s^2) 9.78
Escape velocity (Km/s) 11.186
Visual magnitude V(1.0) -3.86
Solar irradiance (W/m^2) 1380
Topographic range (Km) 20
Moment of inertia 0.3308
 
Orbital parameters  
Semimajor axis (10^6 Km) 149.6
Sidereal orbit period (days) 365.256
Tropical orbit period (days) 365.242
Mean orbital velocity (Km/s) 29.79
Orbit inclination (degrees) 0.00
Eccentricity 0.0167
Sidereal rotation period (hours) 23.9345
Obliquity (degrees) 23.44
 
Terrestrial magnetosphere  
Dipole field strength 0.3076 gauss-Rt^3
Latitude/Longitude of dipole N 78.6 degrees N/70.1 degrees W
Note: Rt denotes terrestrial radius (6,378 Km)
 
Terrestrial atmosphere  
Surface pressure 1014 mb
Scale height 8.5 Km
Average temperature 288 K
Diurnal temperature range 283 K à 293 K
Wind speeds 0 à 100 m/s
Atmospheric composition (by mass) 75.5% Nitrogen, 23.1% Oxygen, 1.3% Argon, 0.03% Carbon dioxide

Mars

Mars/Earth comparison

Bulk parameters Mars Ratio Mars/Earth
Mass (10^24 Kg) 0.6419 0.107
Equatorial radius (Km) 3393 0.532
Polar radius (Km) 3373 0.531
Core radius (Km) 1700 0.488
Ellipticity 0.0065 1.912
Mean density (Kg/m^3) 3933 0.713
Surface gravity (m/s^2) 3.69 0.377
Escape velocity (Km/s) 5.03 0.450
Visual magnitude V(1.0) -1.52 -
Solar irradiance (W/m^2) 595 0.431
Topographic range (Km) 36 1.800
Moment of inertia 0.366 1.106
 
Orbital parameters Mars Ratio Mars/Earth
Semimajor axis (10^6 Km) 227.9 1.524
Sidereal orbit period (days) 686.980 1.881
Tropical orbit period (days) 686.930 1.881
Synodic period (days) 779.94 -
Mean orbital velocity (Km/s) 24.13 0.810
Orbit inclination (degrees) 1.85 -
Eccentricity 0.0934 5.593
Sidereal rotation period (hours) 24.6229 1.029
Obliquity (degrees) 23.98 1.023
 
Martian atmosphere  
Surface pressure 6.9 mb to 9 mb
Scale height 8 km
Average temperature ~210 K
Diurnal temperature range 184 K à 242 K
Wind speeds 2-7 m/s (summer),
5-10 m/s (fall),
17-30 m/s (dust storm)
Atmospheric composition 95.3% Carbon dioxide, 2.7% Nitrogen, 1.6% Argon, 0.4% Other

Jupiter

Jupiter/Earth comparison

Bulk parameters Jupiter Ratio Jupiter/Earth
Mass (10^24 Kg) 1,898.6 317.757
Equatorial radius (level 1 bar) (Km) 71,492 11.209
Polar radius (level 1 bar) (Km) 66,854 10.518
Ellipticity 0.0649 19.09
Mean density (Kg/m^3) 1,326 0.240
Surface gravity (eq.) (m/s^2) 23.12 2.364
Escape velocity (Km/s) 59.5 5.317
Visual magnitude V(1.0) -9.40 -
Solar irradiance (W/m^2) 51 0.037
Moment of inertia 0.254 0.768
 
Orbital parameters Jupiter Ratio Jupiter/Earth
Semimajor axis (10^6 Km) 778.3 5.203
Tropical orbit period (days) 4,330.595 11.856
Synodic period (days) 398.88 -
Mean orbital velocity (Km/s) 13.07 0.439
Orbit inclination (degrees) 1.305 -
Eccentricity 0.04845 2.901
Sidereal rotation period (hours) 9.9250 0.415
Obliquity (degrees) 3.12 0.133
 
Jovian magnetosphere  
Dipole field strength 4.28 gauss-Rj^3
Dipole tilt to rotational axis 9.6 degrees
Note: Rj denotes Jovian radius (71,398 Km)
 
Jovian atmosphere  
Surface pressure >>100 bars
Average temperature ~129 K
Temperature at 1 bar ~165 K
Wind speeds Up to ~150 m/s (<30 degrees latitudelatitude )
Up to ~40 m/s (>30 degrees latitude)
Atmospheric major composition Hydrogen (H2) - 89%; Helium (He) - 11%

Saturn

Saturn/Earth comparison

Bulk parameters Saturn Ratio Saturn/Earth
Mass (10^24 Kg) 568.46 95.140
Equatorial radius (level 1 bar) (Km) 60,268 9.449
Polar Radius (level 1 bar) (Km) 54,364 8.553
Ellipticity 0.0980 28.82
Mean density (Kg/m^3) 687 0.124
Surface gravity (eq.) (m/s^2) 8.96 0.916
Escape velocity (Km/s) 35.5 3.172
Visual magnitude V(1.0) -8.88 -
Solar irradiance (W/m^2) 15 0.011
Moment of inertia 0.210 0.635
 
Orbital parameters Saturn Ratio Saturn/Earth
Semimajor axis (10^6 Km) 1,427.0 9.539
Tropical orbit period (days) 10,746.94 29.423
Synodic period (days) 378.09 -
Mean orbital velocity (Km/s) 9.66 0.324
Orbit inclination (degrees) 2.489 0-
Eccentricity 0.05565 3.332
Sidereal rotation period (hours) 10.500 0.439
Obliquity (degrees) 26.73 1.140
 
Saturnian magnetosphere  
Dipole field strength 0.210 gauss-Rs^3
Dipole tilt to rotational axis < 1 degree
Note: Rs denotes radius of Saturn (60,330 Km)
 
Saturnian atmosphere  
Surface pressure >>100 bars
Average temperature ~97 K
Temperature at 1 bar ~134 K
Wind speeds Up to ~400 m/s (<30 degrees latitude)
Up to ~150 m/s (>30 degrees latitude)
Atmospheric major composition Molecular hydrogen(H2) - 89%; Helium (He) - 11%

Uranus

Uranus/Earth comparison

Bulk parameters Uranus Ratio Uranus/Earth
Mass (10^24 Kg) 86.83 14.532
Equatorial radius (level 1 bar) (Km) 25,559 4.007
Polar radius (level 1 bar) (Km) 24,973 3.929
Ellipticity 0.023 6.76
Mean density (Kg/m^3) 1,318 0.239
Surface gravity (eq.) (m/s^2) 8.69 0.889
Escape velocity (Km/s) 21.3 1.903
Visual magnitude V(1.0) -7.19 -
Solar irradiance (W/m^2) 3.8 0.0028
Moment of inertia 0.225 0.680
 
Orbital parameters Uranus Ratio Uranus/Earth
Semimajor axis (10^6 Km) 2,869.6 19.182
Tropical orbit period (days) 30,588.740 83.746
Synodic period (days) 369.66 -
Mean orbital velocity (Km/s) 5.48 0.184
Orbit inclination (degrees) 0.773 -
Eccentricity 0.04724 02.829
Sidereal rotation period (hours) 17.24 0.720
Obliquity (degrees) 97.92 4.178
 
Uranian magnetosphere  
Dipole field strength 0.228 gauss-Ru^3
Dipole tilt to rotational axis 58.6 degrees
Note: Ru denotes radius of Uranus (25,600 Km)
 
Uranian atmosphere  
Surface pressure >>100 bars
Average temperature ~58 K
Temperature at 1 bar ~76 K
Wind speeds 0-200 m/s
Atmospheric major composition Molecular hydrogen(H2) - 89%; Helium (He) - 11%

Neptune

Neptune/Earth comparison

Bulk parameters Neptune Ratio Neptune/Earth
Mass (10^24 Kg) 102.43 17.143
Equatorial radius (Level 1 bar) (Km) 24,766 3.883
Polar radius (Level 1 bar) (Km) 24,342 3.830
Ellipticity 0.0171 5.03
Mean density (Kg/m^3) 1,638 0.297
Surface gravity (eq.) (m/s^2) 11.00 1.125
Escape velocity (Km/s) 23.5 2.100
Visual magnitude V(1.0) -6.87 -
Solar irradiance (W/m^2) 1.5 0.0011
 
Orbital parameters Neptune Ratio Neptune/Earth
Semimajor axis (10^6 Km) 4,496.6 30.057
Tropical orbit period (days) 59,799.9 163.721
Synodic period (days) 367.49 -
Mean orbital velocity (Km/s) 4.75 0.159
Orbit inclination (degrees) 1.773 -
Eccentricity 0.00858 0.514
Sidereal rotation period (hours) 16.11 0.673
Obliquity (degrees) 28.8 1.229
 
Neptunian magnetosphere  
Dipole field strength 0.142 gauss-Rn^3
Dipole tilt to rotational axis 46.9 degrees
Note: Rn denotes Neptunian radius (24,765 Km)
 
Neptunian atmosphere  
Surface pressure >>100 bars
Average temperature ~58 K
Temperature at 1 bar ~72
Wind speeds 0-200 m/s
Atmospheric major composition Molecular hydrogen(H2) - 89%; Helium (He) - 11%

Pluto

Pluto/Earth comparison

Bulk parameters Pluto Ratio Pluto/Earth
Mass (10^24 Kg) 0.0125 0.0021
Equatorial radius (Km) 1137 0.1783
Mean density (Kg/m^3) 2050 0.3714
Surface gravity (m/s^2) 0.66 0.0675
Escape velocity (Km/s) 1.1 0.0983
Solar irradiance (W/m^2) 0.9 0.0007
     
Orbital parameters Pluto Ratio Pluto/Earth
Semimajor axis (10^6 Km) 5913.5 39.529
Sidereal orbit period (days) 90,591 248.02
Synodic period (days) 366.73 -
Mean orbital velocity (Km/s) 4.75 0.1594
Orbit inclination (degrees) 17.15 0-
Eccentricity 0.2482 014.862
Sidereal rotation period (hours) 153.2928 236.4047
Obliquity (degrees) 122.46 5.2244
 
Plutonian atmosphere  
Atmospheric composition: Methane, Nitrogen

Planets satellites data

The Moon

Earth/Moon comparison

Bulk parameters Moon Ratio Moon/Earth
Mass (10^24 Kg) 0.0735 0.0123
Equatorial radius (Km) 1738 0.2725
Polar radius (Km) 1735 0.2730
Ellipticity 0.002 0.5882
Mean density (Kg/m^3) 3340 0.6051
Surface gravity (m/s^2) 1.62 0.1656
Escape velocity (Km/s) 2.38 0.2125
Visual magnitude V(1.0) +0.21 -
Solar irradiance (W/m^2) 1380 1.0000
Topographic range (Km) 25 1.2500
 
Orbital parameters (of the orbit around the Earth)  
Semimajor axis (10^6 Km) 0.3844
Sidereal orbit period (days) 27.322
Synodic period (days) 12.53
Mean orbital velocity (Km/s) 1.023
Orbit inclination (degrees) 5.145
Eccentricity 0.0549
Sidereal rotation period (hours) 655.728
Obliquity (degrees) 6.68

Mars satellites

  Phobos Deimos
Mean distance from Mars (Km) 9377 23436
Tropical orbit period (days) 0.31891 1.26244
Orbital Inclination (degrees) 1.08 1.79
Eccentricity 0.0151 0.00033
Semimajor axis (Km) 13 8
Semiminor axis (Km) 9 5
Mass (10^15 Kg) 10.8 1.8
Mean density (Kg/m^3) 1900 1750
Visual magnitude V(1.0) +11.8 +12.89

Jovian satellites

Bulk parameters

Name Mass

(10^20 Kg)

Radius

(Km)

Mean density

(Kg/m^3)

Galilean Satellites
Io (JI) 893.3 1,821.3 3,530
Europa (JII) 479.7 1,565 2,990
Ganymede (JIII) 1,482 2,634 1,940
Callisto (JIV) 1.076 2,403 1,851
Other Satellites
Metis (JXVI)   20 +/- 10  
Adrastea (JXV)   10 +/- 10  
Amalthea (JV)   131x73x67  
Thebe (JXIV)   50 +/- 10  
Leda (JXIII)   5  
Himalia (JVI)   85 +/- 10  
Lysithea (JX)   12  
Elara (JXVI)   40 +/- 10  
Ananke (JXII)   10  
Carme (JXI)   15  
Pasiphae (JVIII)   18  
Sinope (JIX)   14  

Orbital parameters

Name Semimajor axis Period*

(days)

Inclination Eccentricity
(10^3 Km) (/Jovian radius)
Galilean Satellites
Io (JI) 421.6 5.905 1.769138 0.040 0.041
Europa (JII) 670.9 9.397 3.551810 0.470 0.0101
Ganymede (JIII) 1.070 14.99 7.154553 0.195 0.0015
Callisto (JIV) 1,883 26.37 16.689018 0.281 0.007
Other Satellites
Metis (JXVI) 127.96 1.7922 0.294780 ~0 <0.041
Adrastea (JXV) 128.98 1.8065 0.29826 ~0 ~0
Amalthea (JV) 181.3 2.539 0.498179 0.40 0.003
Thebe (JXIV) 221.90 3.108 0.6745 0.8 0.0015
Leda (JXIII) 11.094 155.38 238.72 27 0.163
Himalia (JVI) 11,480 160.79 250.5662 28 0.163
Lysithea (JX) 11,720 164.15 259.22 29 0.107
Elara (JXVI) 11,737 164.39 259.6528 28 0.207
Ananke (JXII) 21,200 297 631R 147 0.169
Carme (JXI) 22,600 317 692R 163 0.207
Pasiphae (JVIII) 23,500 329 735R 148 0.378
Sinope (JIX) 23,700 332 758R 153 0.275

*R: retrogradation


Saturnian satellites

Bulk parameters

Name Mass

(10^20 Kg)

Radius

(Km)

Mean density

(Kg/m^3)

Major Satellites
Mimas (SI) 0.375 198.8 1140
Enceladus (SII) 0.73 249.1 1120
Tethys (SIII) 6.22 529.9 1000
Dione (SIV) 10.52 560 1440
Rhea (SV) 23.1 764 1240
Titan (SVI) 1345.5 2575 1881
Hyperion (SVII)   185x140x113  
Iapetus (SVIII) 15.9 718 1.020
Other Satellites
Pan (SXVIII)   10  
Atlas (SXV)   18.5x17.2x13.5  
Prometheus (SXVI) 0.0014 74x50x34 270
Pandora (SXVII) 0.0013 55x44x31 420
Epimetheus (SXI) 0.0055 69x55x55 630
Janus (SX) 0.0198 99.3x95.6x75.6 650
Calypso (SXIV)   15x8x8  
Telesto (SXII)   15x12.5x7.5  
Helene (SXII)   16  
Phoebe (SIX)   115x110x105  

Orbital parameters

Name Semimajor axis Period*

(days)

Inclination Eccentricity
(10^3 Km) (/Saturn. radius)
Major Satellites          
Mimas (SI) 185.52 3.0751 0.9424218 1.53 0.0202
Enceladus (SII) 238.02 3.9453 1.370218 0.02 0.0045
Tethys (SIII) 294.66 4.8841 1.887802 1.09 0.0000
Dione (SIV) 377.40 6.2556 2.736915 0.02 0.0022
Rhea (SV) 527.04 8.7360 4.517500 0.35 0.001
Titan (SVI) 1,221.85 20.253 15.945421 0.33 0.0292
Hyperion (SVII) 1,481.1 24.550 21.276609 0.43 0.1042
Iapetus (SVIII) 3,561.3 59.030 79.330183 7.52 0.0283
Other Satellites
Pan (SXVIII) 133.583 2.2142 0.5750    
Atlas (SXV) 137.64 2.2815 0.6019 ~0 ~0
Prometheus (SXVI) 139.35 2.3098 0.612986 0.0 0.0024
Pandora (SXVII) 141.7 2.349 0.628804 0.0 0.0042
Epimetheus (SXI) 151.422 2.5099 0.694590 0.34 0.009
Janus (SX) 151.472 2.5107 0.694590 0.14 0.007
Calypso (SXIV) 294.66 4.8841 1.887802 ~0 ~0
Telesto (SXII) 294.66 4.8841 1.887802 ~0 ~0
Helene (SXII) 377.4 6.256 2.736915 0.2 0.005
Phoebe (SIX) 12,952 214.69 550.48R 175.3 0.163

*R: retrogradation


Uranian satellites

Bulk parameters

Name Mass

(10^20 Kg)

Radius

(Km)

Mean density

(Kg/m^3)

Major Satellites
Miranda (UV) 0.659 240x234.2x232.9 1,200
Ariel (UI) 13.53 581.1x577.9x577.7 1,670
Umbriel (UII) 11.72 584.7 1,400
Titania (UIII) 35.27 788.9 1,710
Oberon (UIV) 30.14 761.4 1,630
Other Satellites
Cordelia (UVI)   13  
Ophelia (UVII)   16  
Bianca (UVIII)   22  
Cressida (UIX)   33  
Desdemona (UX)   29  
Juliet (UXI)   42  
Portia (UXII)   55  
Rosalind (UXIII)   29  
Belinda (UXIV)   34  
Puck (UXV)   77  

Orbital parameters

Name Semimajor axis Period*

(days)

Inclination Eccentricity
(10^3 Km) (/Uranian radius)
Major Satellites
Miranda (UV) 129.8 5.078 1.413 4.22 0.0027
Ariel (UI) 191.2 7.481 2.520 0.31 0.0034
Umbriel (UII) 266.0 10.41 4.144 0.36 0.0050
Titania (UIII) 435.8 17.05 8.706 0.10 0.0022
Oberon (UIV) 582.6 22.79 13.463 0.10 0.0008
Other Satellites
Cordelia (UVI) 49.752 1.947 0.335033 0.1 0.000
Ophelia (UVII) 53.764 2.104 0.376409 0.1 0.010
Bianca (UVIII) 59.165 2.315 0.434577 0.2 0.001
Cressida (UIX) 61.777 2.417 0.463570 0.0 0.000
Desdemona (UX) 62.659 2.452 0.473651 0.2 0.000
Juliet (UXI) 64.358 2.518 0.493066 0.1 0.001
Portia (UXII) 66.097 2.586 0.513196 0.1 0.000
Rosalind (UXIII) 69.927 2.736 0.558459 0.3 0.000
Belinda (UXIV) 75.255 2.944 0.623525 0.0 0.000
Puck (UXV) 86.004 3.365 0.761832 0.3 0.000

Neptunian satellites

Bulk parameters

Name Mass

(10^20 Kg)

Radius

(Km)

Mean density

(Kg/m^3)

Naiad (NIII)   29  
Thalassa (NIV)   40  
Despina (NV)   74  
Galatea (NVI)   79  
Larissa (NVII)   104x89  
Proteus (NVIII)   218x208x201  
Triton (NI) 214.7 1,352.6 2,054
Neried (NII)   170  

Orbital parameters

Name Semimajor axis Period*

(days)

Inclination Eccentricity
(10^3 Km) (/Neptun. radius)
Naiad (NIII) 48.227 1.948 0.294396 4.74 0.00
Thalassa (NIV) 50.075 2.022 0.311485 0.21 0.00
Despina (NV) 52.526 2.121 0.334655 0.07 0.00
Galatea (NVI) 61.953 2.502 0.428745 0.05 0.00
Larissa (NVII) 73.548 2.970 0.554654 0.20 0.00
Proteus (NVIII) 117.647 4.751 1.122315 0.55 0.00
Triton (NI) 354.76 14.328 5.876854R 156.834  
Neried (NII) 5,513.4 222.67 360.13619 7.23 0.7512

*R: retrogradation


Charon

Average distance to Pluto (Km) 19,405
Tropical orbit period (days) 6.387
Orbit inclination (degrees) 96.56
Eccentricity 0.0
Equatorial radius (Km) 586
Mass (10^21 Kg) 1.7
Mean density (Kg/m^3) 1800
Surface gravity (m/s^2) 0.21
Escape velocity (Km/s) 0.58

Comets data

Some periodic comets

Name Period

(years)

Perihelion date Perihel. distance

(AU)

1/2mj axis

(AU)

Eccentricity Inclination

(degrees)

Abs. magnitude
Halley 76.1 1986-02-09 0.587 17.94 0.967 162.2 5.5
Grigg-Skjellerup 5.09 1992-07-22 0.989 2.96 0.664 21.1 12.5
Giacobini-Zinner 6.52 1992-04-12 0.996 3.52 0.706 31.8 9.0
Crommelin 27.9 1984-09 0.743 9.20 0.919 29.0 12.0
Temple-Tuttle 32.92 1998-02-27 0.982 10.33 0.906 162.5 9.0
Encke 3.30 1980-12-07 0.340 2.21 0.847 11.8 9.8
Kohoutek 6.24 1973-12-28 1.571 3.4 0.537 5.4  
Wirtanen 5.46 1997-03-14 1.063 3.12 0.652 11.7 9.0
Wild 2 6.17 1997-05-06 1.491 3.44 0.540 3.2 6.5
Hale-Bopp 2380 1997-04-1.1381 0.914129959   0.995112269 89.4296941  

Asteroids data

Some asteroids

Information about some asteroids

Name Diameter Mass Period orbit. P. spec. Cl. 1/2mj ax. Eccent. Inclin.
    (km) (10^15 kg) (hours) (years)   (AU)   (degrees)
1 Ceres 974 1000 000 9.078 4.60 C 2.767 0.079 10.6
2 Pallas 538 250 000 7.811 4.61 U 2.771 0.235 34.8
3 Juno 268 20 000 7.21 4.36 S 2.670 0.256 13.0
4 Vesta 526 300 000 5.342 3.63 U 2.362 0.088 7.1
2060 Chiron 180 4000 5.9 50.7 B 13.704 0.383 6.9