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A hot Neptune is a type of giant planet with a mass similar to that of Neptune or Uranus orbiting close to its star, normally within less than 1 AU. [1] The first hot Neptune to be discovered with certainty was Gliese 436 b (Awohali) in 2007, an exoplanet about 33 light years away.
Gliese 436 b / ˈ ɡ l iː z ə / (sometimes called GJ 436 b, [7] formally named Awohali [2]) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. [1] It was the first hot Neptune discovered with certainty (in 2007) and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.
The relative "hot spot" is due to Neptune's axial tilt, which has exposed the south pole to the Sun for the last quarter of Neptune's year, or roughly 40 Earth years. As Neptune slowly moves towards the opposite side of the Sun, the south pole will be darkened and the north pole illuminated, causing the methane release to shift to the north pole.
Hot Neptunes are — theoretically — worlds the size of Neptune or slightly larger than Neptune, orbiting close to their parent stars. NASA says this planet is just too damn hot to exist Skip to ...
GJ 3470 b (occasionally Gliese 3470 b, formally named Phailinsiam [2]) is an exoplanet orbiting the star GJ 3470, located in the constellation Cancer.With a mass of just under 14 Earth-masses, a radius approximately 4.3 times that of Earth's, and a high equilibrium temperature of 615 K (342 °C; 647 °F), [4] it is a hot Neptune.
Vega b, reported in 2021, is a candidate ultra-hot Neptune with a mass of ≥21.9 M E that revolves around Vega every 2.43 days, a mere 0.04555 AU (6,814,000 km) from its luminous host star. The equilbrium temperature of the planet is a white-hot 3,250 K (2,980 °C; 5,390 °F) assuming a Bond albedo of 0.25, which, if confirmed, would make it ...
At least one exoplanet has been discovered orbiting GJ 3470 at a distance of 0.035 astronomical units. The exoplanet, which is called GJ 3470 b, is a hot Neptune with an orbital period of 3.3 days. It was discovered in 2012 using radial velocity observations from HARPS, and transit observations from TRAPPIST.
This year’s shifty skies are led by the planet Neptune ending its thirteen-year cycle in Pisces to begin a new one in the sign of Aries. This shift, which last occurred in 1875, is set to revive ...