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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 ...
Near-Earth comets (NECs) are objects in a near-Earth orbit with a tail or coma made up of dust, gas or ionized particles emitted by a solid nucleus. Comet nuclei are typically less dense than asteroids but they pass Earth at higher relative speeds, thus the impact energy of a comet nucleus is slightly larger than that of a similar-sized ...
The following is a list of comets discovered, co-discovered and re-discovered by the Lincoln Laboratory Near-Earth Asteroid Research project (LINEAR), an Earth-based automated sky survey. In comet nomenclature, the letter before the "/" is either "C" (a non-periodic comet), "P" (a periodic comet), "D" (a comet which has been lost or has ...
Trajectory of 2004 FH in the Earth–Moon system Goldstone radar images of asteroid 2007 PA 8 's Earth flyby in 2012. This is a list of examples where an asteroid or meteoroid travels close to the Earth. Some are regarded as potentially hazardous objects if they are estimated to be large enough to cause regional devastation.
This category contains near-Earth comets. In general, numbered objects in this category should be sorted using a sortkey based on their numerical prefix (0-padded-three-digits plus single letter, see order in List of numbered comets), for example: 13P/Olbers would use [[Category:Near-Earth comets|013P]].
Articles about near-Earth objects, including any small Solar System body whose orbit brings it into proximity with Earth.By convention, a Solar System body is a NEO if its closest approach to the Sun is less than 1.3 astronomical units (AU).
About 1000 objects per year EURONEAR: 2006 [2] International Near-Earth Asteroid Survey: Lincoln Near-Earth Asteroid Research (LINEAR) 1998 Lowell Observatory Near-Earth-Object Search: 1993 2008 Near Earth Object Surveillance Satellite: 2013 Microsatellite observatory Near-Earth Asteroid Tracking (NEAT) 1995 2007 NELIOTA: 2017 2023
These comets come from the Kuiper belt and scattered disk, beyond the orbit of Pluto, with possible origins in the Oort cloud for many. For comets with an orbital period of over 1000 years (semi-major axis greater than ~100 AU), see the List of near-parabolic comets.