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Neptune ♆
Planet Neptune

♆ Neptune: The Methane Planet     

Neptune is the last of eight planets in our solar system (Pluto was demoted). Neptune is one of the outer "ice giant" planets and has five faint rings. Neptune is best viewed in summer in the constellation Capricornus.

Communication delay = 4.2 hours. Neptune is between 2.7 billion (closest approach) and 2.9 billion (farthest away) miles from the earth.

Neptune Facts
      1. Mass (kg)
      2. 1.024e+26
      1. Radius (km)
      2. 24,746
      1. Density (gm/cm3)
      2. 1.64
      1. Distance from sun (km)
      2. 4,504,300,000
      1. Rotational period (days)
      2. 16.11
      1. Orbital period (years)
      2. 164.79
      1. Orbital velocity (km/sec)
      2. 5.45
      1. Eccentricity of orbit
      2. 0.0097
      1. Tilt of axis (°)
      2. 28.31
      1. Inclination of orbit (°)
      2. 1.774
      1. Surface gravity (m/sec2)
      2. 11.0
      1. Escape velocity (km/sec)
      2. 23.50
      1. Albedo
      2. 0.41
      1. Magnitude
      2. 7.84
      1. Cloud temperature
      2. -173°C
      1. Atmosphere
      2. H=85%, He=13%, CH4=2%
      1. Moons
      2. 14


    Rings of Neptune
        1. Name
        2. Distance (km)
        3. Shepherd Moon
        1. Galle Ring
        2. 40,900 - 42,900
        1. Le Verrier Ring
        2. 53,200
        1. Lassell Ring
        2. 53,200 - 57,200
        1. Arago Ring
        2. 57,200


      Neptune surface map

      Neptune surface map



      Neptune vs. Earth ratios


      diameter = 3.9
      gravity = 1.1
      surface pressure = ?
      solar irradiance = 0.001
      day = 0.67
      year = 163.7
      sun distance = 30
        
      diameter = 1
      gravity = 1
      surface pressure = 1
      solar irradiance = 1
      day = 1
      year = 1
      sun distance = 1




      14 moons of Neptune in order of size

      Visual magnitude of major moons shown in parentheses. Triton at magnitude 13.4 is viewable using a good-sized telescope.