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Least dense Kepler-51d: Kepler-51 [41] 0.0381 ± 0.0085 g/cm 3 [42] Next least dense are the hot Jupiter HAT-P-67b with about 0.044 g/cm 3 and the super-Neptune planet WASP-193b with 0.059 ± 0.014 g/cm 3. [43] A predicted highly evaporating planet was proposed to orbit the star FU Orionis north with a density of about 0.0042 g/cm 3. [d]
Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm 3, but it is just as likely that they have a comet-like density of only 0.5 g/cm 3. [ 4 ] For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 ...
Thus, the density of the planet is estimated to be a mere 0.059 g/cm 3 —well below the typical value seen in gas giants (0.2–2 g/cm 3), and less than a tenth that of Saturn (0.687 g/cm 3 [15]), the least dense planet in the Solar System. [1]
The planet is located some 1,200 light-years away. A light-year is 5.8 trillion miles. It's the second-lightest exoplanet found so far based on its dimensions and mass, according to the researchers.
Has one confirmed, potentially habitable exoplanet [161] 2M1207 A 173,925 Brown dwarf: Has one confirmed exoplanet [162] CM Draconis A (CM Dra A) 176,000 Red dwarf [163] DG Canum Venaticorum: 176,000 [164] Gliese 625: 177,400 [165] Gliese 12: 182,065 Has one known exoplanet [166] AM Herculis red dwarf 180,882 [167] 55 Cancri B 186,447.5 [168 ...
Kepler-37e is listed with a radius of 0.37 ± 0.18 R 🜨 in the Exoplanet Archive based on KOI data, but the existence of this planet is doubtful, [22] and assuming its existence, a 2023 study found a mass of 8.1 ± 1.7 M 🜨, inconsistent with such a small radius.
From the total of 5,086 stars known to have exoplanets (as of January 26, 2024), there are a total of 1,033 known multiplanetary systems, [1] or stars with at least two confirmed planets, beyond the Solar System. This list includes systems with at least three confirmed planets or two confirmed planets where additional candidates have been proposed.
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io. [1]