◆ Neptune

  Neptune is the 8th planet in the solar system, an ice giant.

                                               
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  Type              Planet
  Magnitude         7.8
  Distance          29.08 AU, 242 light-minutes
  Apparent size     2″

  Known as
  Symbol            ♆

  Physical
  Radius            24,624 km, 4 Earths across
  Mass              17 Earths
  Density           1.64 g/cm3
  Surface gravity   11.2 m/s2, 1.14x Earth's
  Escape velocity   23.5 km/s
  Day               16h 07m
  Year              164.8 Earth years
  Axial tilt        28.3 degrees
  Albedo            0.41, reflects 41% of the light hitting it
  Temperature       72 K, -201 C
  Moons             16

  More information about Neptune

  Neptune is never visible to the naked eye, and it was found by
  arithmetic before anybody looked for it. Uranus was not moving quite as
  the calculations said it should, and the discrepancy suggested something
  further out was pulling on it. Two mathematicians worked out where that
  something had to be, and in 1846 a telescope was pointed at the
  predicted spot and found the planet within a degree of it. Its winds are
  the fastest in the solar system, over 2,000 kilometres an hour, on a
  world that receives one nine-hundredth of the sunlight we get. The name
  is the Latin Neptunus, "the god of water", and it was chosen within
  weeks of the discovery, over Le Verrier's own preference, which was to
  name it after himself.

  Not settled: The root is disputed. A link to Vedic Apam Napat, child of
  the waters, is a serious proposal and not settled.

  History
  Discovered      1846, Le Verrier and Galle, predicted before it was seen
  First visited   Voyager 2, 1989, and nothing since
  Missions        Voyager 2   1989

  Etymology
  From            Latin
  Reading         Neptunus
  Literally       unknown, god of water

  where it is tonight:  skymap.sh/Neptune