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3200 Phaethon

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Discovery date  11 October 1983
Alternative names  1983 TB
Orbital period  524 days
Orbital period  1.4 years
Orbits  Sun
Named after  Phaëton
Observation arc  11,782 days (32.26 a)
Orbital period  1.4 years
Discovered  11 October 1983
Spectral type  B-type asteroid
3200 Phaethon 3200 Phaethon Wikipedia

Discovered by  Simon Green andJohn K. Davies / IRAS
Minor planet category  Apollo asteroidMercury-crosser asteroidVenus-crosser asteroidEarth-crosser asteroidMars-crosser asteroid
Similar  Sun, Solar System, 55P/Tempel–Tuttle, (196256) 2003 EH1, Castor

3200 phaethon rock comet the 2014 geminid meteor shower science at nasa

3200 Phaethon (/ˈf.əθɒn/ FAY-ə-thon, sometimes incorrectly spelled Phaeton) is an Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other named asteroid (though there are several unnamed asteroids, including three numbered ones, with smaller perihelia, e.g. (137924) 2000 BD19). For this reason, it was named after the Greek myth of Phaëton, son of the sun god Helios. It is 5.1 ± 0.2 km (3.17 ± 0.12 mi) in mean diameter.


3200 Phaethon Geminid Meteor Shower Defies Explanation Science Mission Directorate

rock comet 3200 phaethon


3200 Phaethon Rock Comet Sprouts a Tail Science Mission Directorate

Phaethon was the first asteroid to be discovered using images from a spacecraft. Simon F. Green and John K. Davies discovered it in images from October 11, 1983, while searching Infrared Astronomical Satellite (IRAS) data for moving objects. It was formally announced on October 14 in IAUC 3878 along with optical confirmation by Charles T. Kowal, who reported it to be asteroidal in appearance. Its provisional designation was 1983 TB, and it later received the numerical designation and name 3200 Phaethon in 1985.

Orbital characteristics

3200 Phaethon Asteroids and comets Which is which

It is categorized as an Apollo asteroid, as its semi-major axis is greater than that of the Earth's and its perihelion is less than 1.017 AU (152 million km; 94.5 million mi). It is also suspected to be a member of the Pallas family of asteroids.

3200 Phaethon httpsuploadwikimediaorgwikipediacommonsthu

Phaethon's most remarkable distinction is that it approaches the Sun closer than any other named asteroid: its perihelion is only 0.14 AU (20.9 million km; 13.0 million mi) — less than half of Mercury's perihelial distance. It is a Mercury-, Venus-, Earth-, and Mars-crosser as a result of its high orbital eccentricity. The surface temperature at perihelion could reach around 1,025 K (750 °C; 1,390 °F).

Physical characteristics

Phaethon is an asteroid with fairly unusual characteristics in that its orbit more closely resembles that of a comet than an asteroid; it has been referred to as a "rock comet". In recent studies performed by NASA's STEREO spacecraft, dust tails have been observed, and in 2010 Phaethon was detected ejecting dust. It is possible that the Sun's heat is causing fractures similar to mudcracks in a dry lake bed.

3200 Phaethon Is Phaethon a quotRock Cometquot Sky amp Telescope

Phaethon's composition fits the notion of its cometary origin; it is classified as a B-type asteroid because it is composed of dark material. Since its discovery, several other objects were found exhibiting mixed cometary and asteroidal features, such as 133P/Elst–Pizarro.

Meteor shower

Shortly after its discovery, Fred Whipple observed that the "orbital elements of 1983 TB shown on IAUC 3879 are virtually coincident with the mean orbital elements of 19 Geminid meteors photographed with the super-Schmidt meteor cameras". In other words, Phaethon is the long-sought parent body of the Geminids meteor shower of mid-December.

Recent close approaches

Phaethon approached to 0.120895 AU (18,085,600 km; 11,237,900 mi) of Earth on December 10, 2007. On December 10, 2017, it will pass 0.06893 AU (10,312,000 km; 6,407,000 mi) from Earth. Then on December 14, 2093, it will pass 0.0198 AU (2,960,000 km; 1,840,000 mi) from Earth.

When Phaethon came to perihelion in July 2009, it was found to be brighter than expected. During its approach, the STEREO-A spacecraft detected an unexpected brightening, roughly by a factor of two.


3200 Phaethon Wikipedia