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<title>Pluto Fact Sheet</title>
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<h3>Pluto Fact Sheet</h3>
<img src="../images/pluto">Pluto
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<h4>Pluto/Earth Comparison</h4>

<h5>Bulk parameters</h5>
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                                  Pluto          Earth      Ratio (Pluto/Earth)
Mass (10<sup>24</sup> kg)                    0.0125         5.9736         0.0021
Volume (10<sup>10</sup> km<sup>3</sup>)                 0.616        108.321          0.0057
Volumetric mean radius (km)        1137           6371          0.1785         
Mean density (kg/m<sup>3</sup>)               2050           5520          0.3714
Surface gravity (m/s<sup>2</sup>)            0.66           9.78           0.0675
Escape velocity (km/s)            1.1           11.19           0.0983
GM (x 10<sup>6</sup> km<sup>3</sup>/s<sup>2</sup>)                 0.00083        0.3986         0.0021  
Bond albedo                       0.145          0.385          0.377
Visual Geometric Albedo           0.3            0.367          0.817
Solar irradiance (W/m<sup>2</sup>)           0.9            1380           0.0007
Black-body temperature (K)       42.7          247.3            0.1653
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<h5>Orbital parameters</h5> 
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                                  Pluto           Earth      Ratio (Pluto/Earth)
Semimajor axis (10<sup>6</sup> km)         5913.5           149.6           39.53
Sidereal orbit period (days)     90,465          365.256        247.68
Tropical orbit period (days)     90,588          365.242        248.02
Perihelion (10<sup>6</sup> km)             4445.8           147.1           30.22        
Aphelion (10<sup>6</sup> km)               7381.2           152.1           48.53
Synodic period (days)            366.73             -              -
Mean orbital velocity (km/s)       4.75           29.79           0.1594
Orbit inclination (deg)           17.15            0.00            -
Orbit eccentricity                 0.2482          0.0167        14.862
Sidereal rotation period (hrs)   153.2928         23.9345         6.4047
Obliquity to orbit (deg)         122.46           23.45          (2.4563)
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<h4>Pluto Atmosphere</h4>
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Surface Pressure: ~3 microbar
Average temperature: ~50 K
Scale height: ~60 km
Mean molecular weight: ~16-25 g/mole
Atmospheric composition:  Methane (CH<sub>4</sub>), Nitrogen (N<sub>2</sub>)

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<h4>Charon</h4>
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Mean distance from Pluto (km)    19,405        
Sidereal orbit period (days)       6.387        
Orbital inclination (deg)         96.56       
Orbital eccentricity               0.0
Equatorial radius (km)             586          
Mass (10<sup>21</sup> kg)                     1.7         
Mean density (kg/m<sup>3</sup>)              1800
Surface gravity (m/s<sup>2</sup>)             0.21
Escape velocity (km/s)             0.58  
Albedo                             0.375
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