page_title: Phaeton (hypothetical planet)
section_title: Phaeton hypothesis
hierarchical_section_title: Phaeton (hypothetical planet) / Phaeton hypothesis
caption_attribution_description: Deutsch: Sturz des Phaeton,_Deckengemälde von Johann Michael Franz in der ehemaligen Fürstbischöflichen Residenz Eichstätt
context_page_description: Phaeton was the hypothetical planet theorized by the Titius–Bode law to have existed between the orbits of Mars and Jupiter, the destruction of which supposedly led to the formation of the asteroid belt. The hypothetical planet was named for Phaethon, the son of the sun god Helios in Greek mythology, who attempted to drive his father's solar chariot for a day with disastrous results and was ultimately destroyed by Zeus. However, his name was also used historically for Jupiter itself as well.
context_section_description: According to the hypothesized Titius–Bode law, a planet was believed to exist between Mars and Jupiter. After learning of the regular sequence discovered by the German astronomer and mathematician J.D. Titius (1729–1796), astronomer Johann E. Bode urged a search for the fifth planet corresponding to a gap in the sequence. (1) Ceres, the largest asteroid in the asteroid belt (now considered a dwarf planet), was serendipitously discovered in 1801 by the Italian Giuseppe Piazzi and found to closely match the "empty" position in Titius' sequence, which led many to believe it to be the "missing planet". However, in 1802 astronomer Heinrich W.M. Olbers discovered and named the asteroid (2) Pallas, a second object in roughly the same orbit as (1) Ceres.
  Olbers proposed that these two discoveries were the fragments of a disrupted planet that had formerly orbited the Sun, and predicted that more of these pieces would be found. The discovery of the asteroid (3) Juno by Karl Ludwig Harding and (4) Vesta by Olbers, buttressed his hypothesis.
  In 1823, German linguist and retired teacher J.G. Radlof called Olbers' destroyed planet Phaëthon, linking it to the Greek myths and legends about Phaethon and others. The idea was similar to those later advocated by Immanuel Velikovsky but only in that the catastrophe was in recent times. Despite Radlof's precedence, Russian authors of the 20th century claimed that, "The hypothetical planet of Olbers' was left nameless for a century and a half. Only in 1949 did the well-known Soviet astronomer Sergej Vladirimovich Orlov give it the name Phaeton."
  In 1927, Franz Xaver Kugler wrote a short book titled Sibyllinischer Sternkampf und Phaëthon in naturgeschichtlicher Beleuchtung (The Sybilline Battle of the Stars and Phaeton Seen as Natural History). The central idea in Kugler’s book is that the myth of Phaethon was based on a real event: Making use of ancient sources, Kugler argued that Phaeton had been a very bright celestial object that appeared around 1500 BC which fell to Earth not long afterwards as a shower of large meteorites, causing catastrophic fires and floods in Africa and elsewhere. 
  Theories regarding the formation of the asteroid belt from the destruction of a hypothetical fifth planet are today collectively referred to as "the disruption theory". This theory states that there was once a major planetary member of our Solar System circulating in the present gap between Mars and Jupiter, which was destroyed by one or more of the following hypothetical processes:
  it veered too close to Jupiter and was torn apart by its powerful tides
  it was struck by another large celestial body
  it was destroyed by a hypothetical brown dwarf, the companion star to the Sun, known as Nemesis
  it was shattered by some internal catastrophe
  In 1953, Soviet Russian astronomer I. I. Putilin suggested that Phaeton was destroyed due to centrifugal forces, giving it a diameter of approximately 6,880 kilometers and a rotational speed of 2.6 hours. Eventually, the planet became so distorted that parts of it near its equator were spun off into space. Outgassing of gases once stored in Phaeton's interior caused multiple explosions, sending material into space and forming asteroid families. However, his theory was not widely accepted. Two years later in 1955, Odessan astronomer K. N. Savchenko suggested that Ceres, Pallas, Juno, and Vesta were not fragments of Phaeton, but rather its former moons. Phaeton had an additional fifth satellite, assumed to be the size of Ceres, orbiting near the planet's Hill sphere, and thus more subject to gravitational perturbations from Jupiter. As a result, the fifth satellite became tidally detached and orbited the Sun for millions of years afterward, making periodic close misses with Phaeton that slowly increased its velocity. Once the escaped satellite re-entered Phaeton's Hill sphere, it collided with the planet at high speed, shattering it while Ceres, Pallas, Juno, and Vesta assumed heliocentric orbits. Simulations showed that for such a Ceres-sized body to shatter Phaeton, it woul
caption: Sturz des Phaeton (Fall of the Phaeton) by Johann Michael Franz
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