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  2. List of gravitationally rounded objects of the Solar System

    en.wikipedia.org/wiki/List_of_gravitationally...

    The moons of the trans-Neptunian objects (other than Charon) have not been included, because they appear to follow the normal situation for TNOs rather than the moons of Saturn and Uranus, and become solid at a larger size (900–1000 km diameter, rather than 400 km as for the moons of Saturn and Uranus).

  3. Observational history of comets - Wikipedia

    en.wikipedia.org/.../Observational_history_of_comets

    He deducted that comets maintained its visual appearance, regardless of the view and angle in which is observed near the horizon of the Sun. Pena argued that the orientation and appearance of the comets were due to the physics of space. Pena claimed comets were at a farther distance from the Earth than the Moon as it would pass the Moon at a ...

  4. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    Common targets of amateur astronomers include the Sun, the Moon, planets, stars, comets, meteor showers, and a variety of deep-sky objects such as star clusters, galaxies, and nebulae. Astronomy clubs are located throughout the world and many have programs to help their members set up and complete observational programs including those to ...

  5. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center [6] and JPL Solar System Dynamics, [5] give somewhat contradictory size and albedo estimates depending on which research paper is being cited.

  6. Discovery and exploration of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Discovery_and_exploration...

    Mapping of Titan's surface and observations of other moons from the Cassini spacecraft. [62] As Venus, Titan also possesses an opaque atmosphere. By 2018, there have been radar observations of 138 main belt asteroids, 789 near-Earth asteroids, and 20 comets, including 73P/Schwassmann-Wachmann. [63]

  7. Comet - Wikipedia

    en.wikipedia.org/wiki/Comet

    Comets whose aphelia are near a major planet's orbit are called its "family". [81] Such families are thought to arise from the planet capturing formerly long-period comets into shorter orbits. [82] At the shorter orbital period extreme, Encke's Comet has an orbit that does not reach the orbit of Jupiter, and is known as an Encke-type comet.

  8. Lists of comets - Wikipedia

    en.wikipedia.org/wiki/Lists_of_comets

    Periodic comets usually have elongated elliptical orbits, and usually return to the vicinity of the Sun after a number of decades. The official names of non-periodic comets begin with a "C"; the names of periodic comets begin with "P" or a number followed by "P". Comets that have been lost or disappeared have names with a "D". Comets whose ...

  9. List of minor planets and comets visited by spacecraft

    en.wikipedia.org/wiki/List_of_minor_planets_and...

    first soft landing on a comet (November 2014) Notes: (a) Due to a non-spherical, irregular shape, a comet's x, y, and z axes instead of an (average) diameter are often used to describe its dimensions. (b) Closest approach given in multiples of the comet's (average mean) radius · List ordered in ascending order by a comet's first visit.