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Encyclopedia > Apollo asteroid
The Apollo asteroid 25143 Itokawa. Photo courtesy of JAXA.
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The Apollo asteroid 25143 Itokawa. Photo courtesy of JAXA.

The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, the first asteroid of this group to be discovered. They are Earth-crosser asteroids that have orbital semi-major axes greater than that of the Earth. Some can get very close to the Earth, making them a potential threat to our planet (the closer their semi-major axis is to Earth's, the less eccentricity is needed for the orbits to cross). Image File history File links 25143_Itokawa_051101-2_ISAS-JAXA.jpg Hayabusa image of asteroid 25143 Itokawa. ... Image File history File links 25143_Itokawa_051101-2_ISAS-JAXA.jpg Hayabusa image of asteroid 25143 Itokawa. ... Near-Earth asteroids (NEAs) are asteroids whose orbit intersects Earths orbit and which may therefore pose a collision danger, as well as being most easily accessible for spacecraft from Earth. ... 1862 Apollo is a Q-type asteroid, discovered by Karl Reinmuth in 1932, but lost and not recovered until 1973. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... An Earth-crosser asteroid is a Near-Earth asteroid whose orbit crosses that of Earth. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... Earth, also known as Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ...


The largest known Apollo asteroid is 1866 Sisyphus, with a diameter of about 10 km, approximately the size of the Chicxulub object whose impact killed off the dinosaurs. 1866 Sisyphus (sis-É™-fÉ™s) is an Apollo asteroid which, at approximately 10 km in diameter, is the largest of the Earth-crossing asteroids. ... A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... Radar topography reveals the 180 kilometer (112 mile) wide ring of the crater (image courtesy NASA/JPL-Caltech) Chicxulub Crater is an ancient impact crater buried underneath the Yucatan peninsula, with its center located approximately underneath the town of Chicxulub, Yucatán, Mexico. ... The Cretaceous-Tertiary (K-T or KT) extinction event, also known as the KT boundary, was a period of massive extinction of species, about 65. ... Orders Saurischia Sauropodomorpha Theropoda Ornithischia Dinosaurs were reptile-like vertebrates that dominated the terrestrial ecosystem for over 160 million years from around 230 million years ago until 65 million years ago, at the end of the Cretaceous period, when all non-avian dinosaurs became extinct. ...


Well-known Apollo asteroids include:

Name Year Discoverer
2004 AS1 2004 LINEAR
1998 KY26 1998 Spacewatch
1997 XR2 1997 LINEAR
69230 Hermes 1937 Karl Reinmuth
(53319) 1999 JM8 1999 LINEAR
(52760) 1998 ML14 1998 LINEAR
(35396) 1997 XF11 1997 Spacewatch
(29075) 1950 DA 1950 Carl A. Wirtanen
25143 Itokawa 1998 LINEAR
6489 Golevka 1991 Eleanor F. Helin
4769 Castalia 1989 Eleanor F. Helin
4660 Nereus 1982 Eleanor F. Helin
4581 Asclepius 1989 Henry E. Holt, Norman G. Thomas
4486 Mithra 1987 Eric Elst, Vladimir Shkodrov
(4197) 1982 TA 1982 Eleanor F. Helin, Eugene Shoemaker
4183 Cuno 1959 Cuno Hoffmeister
4179 Toutatis 1989 Christian Pollas
4015 Wilson-Harrington   1979 Eleanor F. Helin
3200 Phaethon 1983 Simon Green, John K. Davies / IRAS
2101 Adonis 1936 Eugène Joseph Delporte
2063 Bacchus 1977 Charles T. Kowal
1866 Sisyphus 1972 Paul Wild
1862 Apollo 1932 Karl Reinmuth
1685 Toro 1948 Carl A. Wirtanen
1620 Geographos 1951 Albert George Wilson, Rudolph Minkowski
1566 Icarus 1949 Walter Baade

2004 AS1 (also written 2004 AS1), also known by the temporary name AL00667, is a near-Earth asteroid, first discovered on January 13, 2004, by the LINEAR project. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... The word linear comes from the Latin word linearis, which means created by lines. ... The meteoroid 1998 KY26 (also written 1998 KY26) was discovered on June 2, 1998 by Spacewatch and observed until June 8 while it passed 800,000 kilometers (half a million miles) away from Earth (a little more than twice the Earth-Moon distance). ... 1998 (MCMXCVIII) is a common year starting on Thursday of the Gregorian calendar, and was designated the International Year of the Ocean. ... Spacewatch is a project at the University of Arizona that specializes in the study of minor planets, and including various types of asteroids and comets. ... 1997 XR2 (also written 1997 XR2) is an asteroid discovered in 1997. ... 1997 (MCMXCVII) is a common year starting on Wednesday of the Gregorian calendar. ... The word linear comes from the Latin word linearis, which means created by lines. ... 69230 Hermes is an Apollo, Mars- and Venus-crosser asteroid that passed within 0. ... 1937 (MCMXXXVII) was a common year starting on Friday (link will take you to calendar). ... Karl Wilhelm Reinmuth (April 4, 1892 – May 6, 1979) was a German astronomer. ... (53319) 1999 JM8 (also written (53319) 1999 JM8) is a near_Earth asteroid and Mars_crosser asteroid discovered by LINEAR. Radar imaging by Goldstone and Arecibo has revealed the asteroid to be 3. ... 1999 (MCMXCIX) is a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ... The word linear comes from the Latin word linearis, which means created by lines. ... (52760) 1998 ML14 (also written (52760) 1998 ML14) is an as yet unnamed near_Earth and Mars-crosser asteroid. ... 1998 (MCMXCVIII) is a common year starting on Thursday of the Gregorian calendar, and was designated the International Year of the Ocean. ... The word linear comes from the Latin word linearis, which means created by lines. ... (35396) 1997 XF11 (also written (35396) 1997 XF11) is a near_Earth and Mars-crosser asteroid which, shortly after its discovery in December 1997, was predicted to make an exceptionally close approach to Earth in October 2028. ... 1997 (MCMXCVII) is a common year starting on Wednesday of the Gregorian calendar. ... Spacewatch is a project at the University of Arizona that specializes in the study of minor planets, and including various types of asteroids and comets. ... Asteroid 1950 DA (29075) 1950 DA is an asteroid considered to be the near Earth object with the highest known probability of crashing into Earth, according to the Palermo Technical Impact Hazard Scale. ... 1950 was a common year starting on Sunday (link will take you to calendar). ... Carl Alvar Wirtanen (1910 – 1990) was an American astronomer who worked at Lick Observatory. ... 25143 Itokawa is an Apollo and Mars-crosser asteroid. ... 1998 (MCMXCVIII) is a common year starting on Thursday of the Gregorian calendar, and was designated the International Year of the Ocean. ... The word linear comes from the Latin word linearis, which means created by lines. ... 6489 Golevka is an Apollo, Mars-crosser and Alinda asteroid, discovered in 1991 by Eleanor F. Helin. ... 1991 (MCMXCI) is a common year starting on Tuesday of the Gregorian calendar. ... Eleanor Francis Helin is an American astronomer, principal investigator of the Near Earth Asteroid Tracking (NEAT) program of NASAs Jet Propulsion Laboratory. ... The asteroid 4769 Castalia (previously known by the provisional designation 1989 PB) was the first asteroid to be directly imaged. ... 1989 (MCMLXXXIX) is a common year starting on Sunday of the Gregorian calendar. ... Eleanor Francis Helin is an American astronomer, principal investigator of the Near Earth Asteroid Tracking (NEAT) program of NASAs Jet Propulsion Laboratory. ... 4660 Nereus is a small (1 km in diameter) asteroid, discovered by Eleanor F. Helin on February 28, 1982. ... 1982 (MCMLXXXII) is a common year starting on Friday of the Gregorian calendar. ... Eleanor Francis Helin is an American astronomer, principal investigator of the Near Earth Asteroid Tracking (NEAT) program of NASAs Jet Propulsion Laboratory. ... A small asteroid of the Apollo group that can approach Earth’s orbit to within 600,000 km; it was discovered in 1989 by the American astronomers Henry E. Holt (1929-) and Norman G. Thomas (1930-). Asteroid 4581 Asclepius (1989 FC) passed by the Earth on March 22, 1989 at... 1989 (MCMLXXXIX) is a common year starting on Sunday of the Gregorian calendar. ... Henry E. Holt is an American astronomer. ... Norman G. Thomas is or was an American astronomer. ... 4486 Mithra is an Apollo and Mars-crosser asteroid. ... 1987 (MCMLXXXVII) is a common year starting on Thursday of the Gregorian calendar. ... Eric Walter Elst is a Belgian astronomer. ... Vladimir Georgiev Shkodrov (Владимир Георгиев Шкодров) (born February 10, 1930) is a Bulgarian astronomer. ... (4197) 1982 TA was discovered on October 11, 1982 by Eleanor F. Helin and Eugene Shoemaker. ... 1982 (MCMLXXXII) is a common year starting on Friday of the Gregorian calendar. ... Eleanor Francis Helin is an American astronomer, principal investigator of the Near Earth Asteroid Tracking (NEAT) program of NASAs Jet Propulsion Laboratory. ... Eugene Shoemaker at a stereoscopic microscope used for asteroid discovery Eugene Merle Shoemaker (or Gene Shoemaker) (April 28, 1928 – July 18, 1997) was one of the founders of the fields of planetary science and is best known for co-discovering the Comet Shoemaker-Levy 9 with his wife Carolyn Shoemaker... Cuno, imaged by radar 4183 Cuno is an Apollo, Mars- and Venus-crosser asteroid. ... 1959 (MCMLIX) was a common year starting on Thursday of the Gregorian calendar. ... Cuno Hoffmeister (February 2, 1892 - January 2, 1968) was a German astronomer. ... The asteroid 4179 Toutatis (too-ta-tis) is an Apollo, an Alinda and a Mars-crosser asteroid with a chaotic orbit produced by a 3:1 resonance with the planet Jupiter. ... 1989 (MCMLXXXIX) is a common year starting on Sunday of the Gregorian calendar. ... Christian Pollas is a French astronomer. ... Comet Wilson-Harrington is a periodic comet (formally designated 107P/Wilson-Harrington). ... This page refers to the year 1979. ... Eleanor Francis Helin is an American astronomer, principal investigator of the Near Earth Asteroid Tracking (NEAT) program of NASAs Jet Propulsion Laboratory. ... 3200 Phaethon (sometimes incorrectly spelled Phaeton) is an Apollo and Mercury-, Venus- and Mars_crosser asteroid with unusual properties, and may be an extinct comet. ... 1983 (MCMLXXXIII) is a common year starting on Saturday of the Gregorian calendar. ... This is page about the science fiction novelist. ... The Infrared Astronomical Satellite (IRAS) was a space-based observatory that performed a survey of the entire sky at infrared wavelengths. ... 2101 Adonis was one of the first near-Earth asteroids to be discovered. ... 1936 (MCMXXXVI) was a leap year starting on Wednesday (link will take you to calendar). ... Eugène Joseph Delporte (January 10, 1882 – October 19, 1955) was a Belgian astronomer. ... 3D model of Asteroid 2063 Bacchus (Scott Hudson) The Apollo, Venus- and Mars-crosser asteroid 2063 Bacchus was discovered on April 24, 1977 by Charles T. Kowal at the Palomar Observatory. ... For the album by Ash, see 1977 (album). ... Charles Thomas Kowal (born November 8, 1940) is an American astronomer. ... 1866 Sisyphus (sis-É™-fÉ™s) is an Apollo asteroid which, at approximately 10 km in diameter, is the largest of the Earth-crossing asteroids. ... 1972 (MCMLXXII) was a leap year that started on a Saturday. ... Prof. ... 1862 Apollo is a Q-type asteroid, discovered by Karl Reinmuth in 1932, but lost and not recovered until 1973. ... 1932 (MCMXXXII) is a leap year starting on a Friday. ... Karl Wilhelm Reinmuth (April 4, 1892 – May 6, 1979) was a German astronomer. ... Toro (1948 OA) is the asteroid with the number 1685. ... 1948 (MCMXLVIII) is a leap year starting on Thursday (link will take you to calendar). ... Carl Alvar Wirtanen (1910 – 1990) was an American astronomer who worked at Lick Observatory. ... 3D computer model of the different faces of Geographos. ... 1951 (MCMLI) was a common year starting on Monday; see its calendar. ... Albert George Wilson (July 28, 1918 – ?) was an American astronomer. ... Rudolph Minkowski (born Rudolf Leo Bernhard Minkowski) (May 28, 1895 – January 4, 1976) was a German-American astronomer. ... 1566 Icarus is an Apollo asteroid (a sub-class of near-Earth asteroid) whose unusual characteristic is that at perihelion it is closer to the Sun than Mercury; it is said to be a Mercury-crosser asteroid. ... 1949 (MCMXLIX) is a common year starting on Saturday. ... Wilhelm Heinrich Walter Baade (March 24, 1893 - June 25, 1960) was a German astronomer who emigrated to the USA in 1931. ...

Related topics

The following is a list of current records for Apollo-asteroids. ...

External links

  • List of Apollo minor planets


The minor planetsedit
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud)
For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system
For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.

  Results from FactBites:
 
Apollo asteroid (161 words)
Member of a group of asteroids whose orbits cross that of the Earth.
They are named after the first of their kind, Apollo, discovered in 1932 by German astronomer Karl Reinmuth and then lost until 1973.
Apollo asteroids are so small and faint that they are difficult to see except when close to the Earth (Apollo is about 2 km/1.2 mi across).
Asteroid - MSN Encarta (2048 words)
Asteroid, one of the many small or minor rocky planetoids that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter.
Asteroids that intersect the orbit of Mars are called Amors; asteroids that intersect the orbit of Earth are known as Apollos; and asteroids that have orbits smaller than Earth’s orbit are called Atens.
Three-quarters of the asteroids visible from Earth, as well as the dwarf planet 1 Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
  More results at FactBites »

 
 

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