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This object is hypothetical.
This object is hypothetical, and was proposed to explain a phenomenon or occurrence. Note that such object has not been discovered or observed.
A hypothetical planet is a planet that has not yet been discovered, but are thought to exist for certain reasons to explain phenomena across are solar system that has not been explained yet. Some hypothetical planets are false, due to being disproven to exist.
List[]
Here is a list of the most known Hypothetical planets.
| Name of Hypothetical Planet | Distance from Sun (in kilometers) | Diameter in kilometers | Reason Hypothesized | Disproven? |
|---|---|---|---|---|
| Vulcan | 885,140 | 3,500 | To explain perturbations in Mercury’s orbit.[1] | Yes |
| Counter-Earth | 150,000,000 | 12,756 | To support Philolaus' non-geocentric cosmology, in which all objects in the universe revolve around a "Central Fire" (unseen from Earth and distinct from the Sun which also revolves around it). | Yes |
| Nibiru | 150,000,000 | 18,000 | End of mayan calendar at December 21, 2012.(?) | Yes |
| Theia | 152,887,680 | 6,102 | To explain the creation of the moon. | No |
| Planet V | 269,276,400 | ~1,600 - 2,700[2] | In Chambers' and Lissauer's hypothesis, the Late Heavy Bombardment of the Hadean era began after perturbations from the other terrestrial planets caused Planet V's orbit to cross into the asteroid belt.Another explanation proposed that a direct impact from Planet V onto Mars may had formed the Borealis Basin on the red planet as an explanation for the Late Heavy Bombardment. | Yes (Original)
No (Alternate) |
| Phaeton | 321,868,800 | 6,880 | To explain the creation and existence of the asteroid belt. | Yes |
| Fifth Giant | Variable until ejection | 74,814 | Reproduces a number of aspects of the current Solar System. | No |
| Uranus Impactor | 2,870,783,139 | 25,512.6 | To explain the highly tilted axis of Uranus. | No |
| Haumea Impactor | ??? | ??? | To explain Haumea's rapid rotation and unique physical characteristics. | No |
| Hyperion | 5,894,156,106 | ??? | Unrelated to Saturn's moon of the same name, this planet was postulated to be the reason for orbital elements of Neptune and the anomalies in Uranus' motion. Eventually in 1930, the object that was being searched for turned out to be Pluto, and not a planet named "Hyperion".[3] | Yes |
| Brahma | 5,826,837,064 | ??? | It was believed that there were two planets beyond Neptune. However, the orbital parameters of Brahma were very identical to Pluto's orbital parameters, which could mean that the planet that Ketakar was looking for was most likely Pluto and not Brahma.[4] | Yes |
| Oceanus | 6,170,912,166 | ??? | Same as Hades, Planet Nine, and Planet 10. | Yes? |
| Hades | 7,479,893,535 | Similar to Uranus and Neptune | A Similar reason like Planet Nine and 10. | Yes? |
| Trans-Oceanus Planet 2 | 8,377,480,759 | ??? | Same as Oceanus. | Yes? |
| Vishnu | 8,911,993,951 | ??? | The same reason as Brahma.[5] | Yes? |
| Trans-Oceanus Planet 3 | 10,771,046,690 | ??? | Same as Oceanus and the Trans-Oceanus planet 2 | Yes? |
| Trans-Plutonian planet | ~14,959,787,070 | ~8,494[6] | The planet is believed to be an icy terrestrial, tenths of Earth's mass. It is believed that during formation, the planet was truncated by one of the gaseous planets, ultimately resulting it stirring the trans-Neptunian belt during its primordial stage. The planet ultimately gained a stable orbit at around 100 AU and at an orbital inclination of 20 to 40 degrees.[7] | No |
| Planet Nine | 148,060,000,000 | 48,200 | To explain the strange orbits of comets and TNOs with large orbits (Like Sedna) | No |
| Planet Ten | 86,000,000,000 | 6,474 | To explain the sudden cutoff of the Kuiper Belt at 75 AU from the Sun, AKA the Kuiper Cliff. | Not entirely |
| Rodney's Planet | 225,308,160,000 | ~49,240 - 6,790 | Rodney Gomes proposes the planet to be the reason for why most objects have extreme orbits. After analyzing 92 Kuiper Belt objects, and compared the results to computer models of how objects should be distributed with or without a planet, Gomes concluded that the models don't produce the highly elliptical orbits for 6 of the objects, and that it could be the result of a planet beyond Neptune.[8] | No |
| Pickering's Planets | Variable | ??? | It was predicted that over about 11 planets existed beyond Neptune's orbit, and sat at varying distances away from the Sun. The planets were named O1, O2, O3, P1, P2, P3, Q, R, S, T, and U.[9] However, S, T, and U were left out, as their derivations had been carried out after Pluto's discovery. The 3 planet P's, Q and R were left out due to their large distances compared to the 3 Planet O's.[10] Eventually, all of the planets appeared to have mostly been ruled out. | Mostly yes |
| Tyche | 2.25 trillion | 160,000 | Whitemire states that Tyche dislodges long-period comets from the Oort Cloud and Tyche may also the tilted orbits of 2006 SQ372 and Sedna, although this is still inconclusive. | Yes |
| Oort cloud planet | More distant than Planet Nine | ~49,240 | Nathen Kaib, along with Sean Raymond and Andre Izidoro, hypothesized that there might be a distant planet located within the Oort cloud.[11] This said planet is thought to be an ice giant, and was likely either an ejected Saturn to Neptune-mass planet,[12] and was captured by the Solar system's Oort cloud some time in its early years. | No |
| A and B | ? | ? | To explain where Mars, the Moon, Pluto, and the other dwarf planets and the formation of Earth, Venus, Mercury, asteroid belt, and comets. | Possible |