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For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [11] Because Sedna and 2002 MS 4 have no known moons, directly determining their mass is impossible without sending a probe (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna [12]).
The choice of solar mass, M ☉, as the basic unit for planetary mass comes directly from the calculations used to determine planetary mass.In the most precise case, that of the Earth itself, the mass is known in terms of solar masses to twelve significant figures: the same mass, in terms of kilograms or other Earth-based units, is only known to five significant figures, which is less than a ...
Discovered in 1989 by Latham to have a minimum mass of 11.069 ± 0.063 M J (at 90°) and a probable mass of approximately 63.2 M J (at 10°), [279] making the former planet the first to be spotted, [280] and confirmed in 1991, it was thought to be the first discovered exoplanet until 2019 when it was confirmed to be a low-mass star with the ...
According to the IAU's explicit count, there are eight planets in the Solar System; four terrestrial planets (Mercury, Venus, Earth, and Mars) and four giant planets, which can be divided further into two gas giants (Jupiter and Saturn) and two ice giants (Uranus and Neptune). When excluding the Sun, the four giant planets account for more than ...
Yale-New Haven Teachers Institute, 07.03.03: "Voyage to the Planets" by Nicholas R. Perrone, 2007 (accessed November 2010) Journey Through the Galaxy: "Planets of the Solar System" by Stuart Robbins and David McDonald, 2006 (accessed November 2010) The Nine Planets, "Appendix 2: Solar System Extrema" by Bill Arnett, 2007 (accessed November 2010)
It has an estimated mass-loss rate of 0.0017 M ☉ (566 Earths) per year, the highest for any star. [113] HV 5618 1,163 [110] Large Magellanic Cloud L/T eff: HV 2242 1,160 [114] – 1,180 [110] Large Magellanic Cloud L/T eff: LMC 25320 1,156 [110] Large Magellanic Cloud L/T eff: SMC 18592 1,129 [110] Small Magellanic Cloud L/T eff: MSX SMC 018 ...
Title Planet Star Data Notes Most massive The most massive planet is difficult to define due to the blurry line between planets and brown dwarfs.If the borderline is defined as the deuterium fusion threshold (roughly 13 M J at solar metallicity [30] [b]), the most massive planets are those with true mass closest to that cutoff; if planets and brown dwarfs are differentiated based on formation ...
Neptune has 16 known moons; the largest, Triton, accounts for more than 99.5 percent of all the mass orbiting the planet. Triton is large enough to have achieved hydrostatic equilibrium, but, uniquely for a large moon, has a retrograde orbit, suggesting it was a dwarf planet that was captured.