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The '''mean radius''' in [[astronomy]] is a measure for the size of [[planet]]s and [[Small Solar System body|small Solar System bodies]]. Alternatively ...title=High precision model of precession and nutation of the asteroids (1) Ceres, (4) Vesta, (433) Eros, (2867) Steins, and (25143) Itokawa|first1=A.|last1= ...

...eroid|NEAs]] are generally well known, though a few have been [[Lost minor planet|lost]]. However, large numbers of smaller NEAs have highly uncertain orbits ...e anticipated longitudinal uncertainty<ref name="MPC-24597"/> in the minor planet's [[mean anomaly]] after 10 years.<ref name="MPC-Uncertainty"/><ref name="U ...

...a bit more effort because the observations were taken from [[Earth]] while Ceres orbits the [[Sun]]. ...

...ation arc, {{mpl|2004 PR|107}} was thought to be a trans-Neptunian [[dwarf planet]], but is now known to be a 1&nbsp;km main-belt asteroid. With an observati ...e than a year after the last observation, and may result in a [[lost minor planet]]. Due to their greater distance from the Sun and slow movement across the ...

...quantity that characterizes the radial distribution of [[mass]] inside a [[planet]] or [[Natural satellite|satellite]]. Since a [[moment of inertia]] has di ...of 1.| group = note}} For a [[Planetary differentiation|differentiated]] planet or satellite, where there is an increase of density with depth, <math>C/MR^ ...

...e [[geocentric coordinate system|geocentric]] [[coordinate systems]] for [[planet]]s other than Earth. ...by [[Merton E. Davies]] of the [[Rand Corporation]], including [[Mercury (planet)|Mercury]],<ref>Davies, M. E., "Surface Coordinates and Cartography of Merc ...

...f the planetesimals via pebble accretion allows for the formation of giant planet cores in the outer [[Solar System]] before the dispersal of the gas disk. A ...{{cite journal|last1=D'Angelo|first1=G.|last2=Bodenheimer|first2=P.|title= Planet Formation by Gas-assisted Accretion of Small Solids|journal=The Astrophysic ...

...lative to each other. Outward from the [[Sun]], the planets are [[Mercury (planet)|Mercury]], [[Venus]], [[Earth]], [[Mars]], [[Jupiter]], [[Saturn]], [[Uran ...number ten, Philolaus created the antichthon, or counter-earth. This tenth planet is always invisible to us, because it is between us and the central fire an ...

.... "Jupiter system"). Where only one satellite is known, or it is [[double planet|a binary]] with a common centre of gravity, it may be referred to using the ...und exoplanets such as [[Kepler-1625b]]. It is also theorised that [[rogue planet]]s ejected from their planetary system could retain a system of satellites. ...

...]], similar to the average distance of the [[Ceres (dwarf planet)|asteroid Ceres]] from the [[Sun]], and traveling at a velocity of {{Convert|177,000|kph|mp ...and was thus listed on [[International Astronomical Union|IAU]]'s [[Minor Planet Center]]'s (MPC) [[Near-Earth Object Confirmation Page]] (NEOCP) as gb00234 ...

...astronomer and physicist; may have been the first to observe belts on the planet Jupiter with a telescope (on 17 May 1630), also claimed to have explored th ...1650), astronomer and mathematician; discovered that the planet [[Mercury (planet)|Mercury]] had [[orbit]]al [[Planetary phase|phases]] ...

{{Short description|Eighth planet from the Sun}} {{About|the planet|the Roman god|Neptune (mythology)|other uses}} ...

...e considered solid fragments from other [[astronomical object]]s such as [[planet]]s, [[asteroid]]s, comets, or [[Natural satellite|moons]]. Most meteorites ...formed; outside of which the [[giant planets|gas giants]] and their [[ice planet|icy moons]] have formed. ...

...-when-italy-banned-non-biodegradable-bags/|title=Bio-plastics: Letting the Planet Breathe|website=www.wipo.int|language=en|access-date=2019-12-19}}</ref><ref ...ect in the [[Asteroid belt]] of the Solar system, and considered a [[dwarf planet]] by modern astronomic terminology. He cataloged 7,646 stars, demonstrating ...