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Neptune's more varied weather when compared to Uranus is due in part to its higher internal heating. The upper regions of Neptune's troposphere reach a low temperature of 51.8 K (−221.3 °C). At a depth where the atmospheric pressure equals 1 bar (100 kPa), the temperature is 72.00 K (−201.15 °C). [128]
Astronomical symbols for the Sun, the planets (first symbol for Uranus), and the Moon, as well as the first symbol for Pluto were taken from NASA Solar System Exploration. [ 103 ] The symbol for Ceres, as well as the second symbol for Uranus, was taken from material published by James L. Hilton.
The symbol, a monogram of the letters PL, could be interpreted to stand for Pluto or for Percival Lowell, the astronomer who initiated Lowell Observatory's search for a planet beyond the orbit of Neptune. Pluto has an alternative symbol consisting of an orb over Pluto's bident: it is more common in astrology than astronomy, and was popularised ...
[a] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50 × 10 9 km). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident .
The origins of the planetary symbols can be found in the attributes given to classical deities. The Roman planisphere of Bianchini (2nd century, currently in the Louvre, inv. Ma 540) [2] shows the seven planets represented by portraits of the seven corresponding gods, each a bust with a halo and an iconic object or dress, as follows: Mercury has a caduceus and a winged cap; Venus has a ...
Proteus (/ ˈ p r oʊ t i ə s / PROH-tee-əs), also known as Neptune VIII, is the second-largest Neptunian moon, and Neptune's largest inner satellite. Discovered by Voyager 2 in 1989, it is named after Proteus , the shape-changing sea god of Greek mythology . [ 11 ]
standardizing sizes of astronomical symbols across the board: 19:03, 30 August 2006: 362 × 355 (1 KB) Justinlebar: The astronomical symbol of the planet Neptune. This SVG is a trace of the symbol as displayed by the font Arial Unicode MS Regular. Saved in Adobe Illustrator CS2. {{pd-ineligible}} Category:Planet symbols Category:Neptune
Despina's diameter is approximately 150 kilometres (93 mi). [4] Despina is irregularly shaped and shows no sign of any geological modification. It is likely that it is a rubble pile re-accreted from fragments of Neptune's original satellites, which were disrupted by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit.