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comprehensive asteroid and comet database space reference space reference compiled data simulations for 1 302 506 celestial objects welcome to spacereference org the purpose of this site is to catalog and showcase every known object in space we ve started with asteroids and comets but this open source project is being quickly expanded spacedb compiles data from the nasa jpl small body database the iau minor planet center and the nasa jpl center for near earth object studies if you d like to create a customized solar system model take a look at the full screen interactive solar system view or view a random object asteroids and comets we ve organized hundreds of thousands celestial objects into these categories below for your perusal mouseover objects in the lists below to highlight them in the orbit view click or tap to learn more about each object largest these are among the largest and earliest discovered asteroids in our solar system ceres dwarf planet ceres orbits the sun every 4 60 years and is about 939 400 km in diameter comparable in size to the u s state of alaska varuna dwarf planet varuna orbits the sun every 282 00 years and is about 900 000 km in diameter comparable in size to the u s state of alaska vesta dwarf planet vesta orbits the sun every 3 64 years and is about 525 400 km in diameter comparable in size to great britain pallas dwarf planet pallas orbits the sun every 4 60 years and is about 513 000 km in diameter comparable in size to great britain hygiea dwarf planet hygiea orbits the sun every 5 56 years and is about 407 120 km in diameter comparable in size to the u s state of iowa upcoming approaches these objects have upcoming fly bys of earth 2019 qk7 very small near earth close approach 2019 qk7 orbits the sun every 0 88 years and is about 0 038 km in diameter comparable in size to a school bus or smaller it will pass by earth on aug 2 2026 2020 pv very small near earth close approach 2020 pv orbits the sun every 2 01 years and is about 0 020 km in diameter comparable in size to a school bus or smaller it will pass by earth on aug 2 2026 2016 up41 very small near earth close approach 2016 up41 orbits the sun every 1 13 years and is about 0 218 km in diameter comparable in size to a football field it will pass by earth on aug 3 2026 2020 pn1 very small near earth close approach 2020 pn1 orbits the sun every 1 00 years and is about 0 039 km in diameter comparable in size to a school bus or smaller it will pass by earth on aug 4 2026 2011 lj1 very small near earth close approach 2011 lj1 orbits the sun every 3 75 years and is about 0 474 km in diameter comparable in size to the u s capitol building it will pass by earth on aug 4 2026 potential impactors these objects have the potential to impact earth listed by probability of impact 2010 rf12 very small near earth close approach 2010 rf12 orbits the sun every 1 09 years and is about 0 010 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 10 240 in 2095 2017 wt28 very small near earth close approach 2017 wt28 orbits the sun every 0 85 years and is about 0 012 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 1 098 in 2104 2020 cd3 very small near earth close approach 2020 cd3 orbits the sun every 1 04 years and is about 0 002 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 851 in 2082 2006 rh120 very small near earth close approach 2006 rh120 orbits the sun every 1 05 years and is about 0 006 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 505 in 2044 2006 jy26 very small near earth close approach 2006 jy26 orbits the sun every 1 02 years and is about 0 007 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 484 in 2074 potential for exploration it is relatively inexpensive to send a spacecraft to these objects in terms of propulsive cost listed by delta v 2021 gm1 very small near earth close approach 2021 gm1 orbits the sun every 0 97 years and is about 0 004 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 002 in 2122 2023 fy3 very small near earth close approach 2023 fy3 orbits the sun every 1 11 years and is about 0 007 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 000 in 2114 2022 rd2 very small near earth close approach 2022 rd2 orbits the sun every 1 05 years and is about 0 009 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 014 in 2087 2022 ob5 very small near earth 2022 ob5 orbits the sun every 1 01 years and is about 0 008 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 005 in 2109 2000 sg344 very small near earth close approach 2000 sg344 orbits the sun every 0 97 years and is about 0 055 km in diameter comparable in size to a school bus or smaller it will pass near earth with an impact probability of 0 104 in 2071 in honor of these objects are named after notable people einstein mid sized einstein orbits the sun every 2 69 years and is about 3 975 km in diameter comparable in size to the island of manhattan hawking mid sized hawking orbits the sun every 3 37 years and is about 2 013 km in diameter comparable in size to mount everest sagan mid sized sagan orbits the sun every 3 26 years and is about 6 559 km in diameter comparable in size to the san francisco bay armstrong mid sized armstrong orbits the sun every 3 31 years and is about 3 720 km in diameter comparable in size to the island of manhattan collins mid sized collins orbits the sun every 3 81 years and is about 8 976 km in diameter comparable in size to the san francisco bay object classifications the two most noteworthy classifications for asteroids are near earth asteroid nea and potentially hazardous asteroid pha despite the names neither classification indicates any direct danger to earth near earth asteroids asteroids whose orbit perihelion is less than 1 3 au potentially hazardous asteroids near earth asteroids whose orbits passes within 0 05 au of earth s and whose absolute magnitude h is 22 0 or brighter learn more about various neo groups here categories asteroids with known shapes these asteroids have been mapped by light curve inversion radar or flybys click through to see 3d models the categories below are orbital classifications as defined by nasa pds unclassified comet comets whose orbits do not match any defined orbit class chiron type comet chiron type comet as defined by levison and duncan tjupiter 3 a ajupiter encke type comet encke type comet as defined by levison and duncan tjupiter 3 a ajupiter halley type comet halley type comet classical definition 20 y p 200 y hyperbolic comet comets on hyperbolic orbits e 1 0 jupiter family comet jupiter family comets as defined by levison and duncan 2 tjupiter 3 parabolic comet comets on parabolic orbits e 1 0 amor class asteroid near earth asteroid whose orbits are similar to that of 1221 amor a 1 0 au 1 017 au q 1 3 au apollo class asteroid near earth asteroids whose orbits cross the earth s orbit similar to that of 1862 apollo a 1 0 au q 1 017 au asteroid asteroid orbit not matching any defined orbit class aten class asteroid near earth asteroid orbits similar to that of 2062 aten a 1 0 au q 0 983 au centaur class asteroid objects with orbits between jupiter and neptune 5 5 au a 30 1 au hyperbolic asteroid asteroids on hyperbolic orbits e 1 0 interior earth asteroid asteroids with orbits contained entirely within the orbit of the earth q 0 983 au inner main belt asteroid asteroids with orbital elements constrained by a 2 0 au q 1 666 au main belt asteroid asteroids with orbital elements constrained by 2 0 au a 3 2 au q 1 666 au mars crossing asteroid asteroids that cross the orbit of mars constrained by 1 3 au q 1 666 au a 3 2 au outer main belt asteroid asteroids with orbital elements constrained by 3 2 au a 4 6 au parabolic asteroid asteroids on parabolic orbits e 1 0 jupiter trojan asteroids trapped in jupiter s l4 l5 lagrange points 4 6 au a 5 5 au e 0 3 trans neptunian object objects with orbits outside neptune a 30 1 au 2021 judy mou and ian webster contact built with spacekit