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The stellar classification of HD 137388 is K2IV, [3] matching that of an evolving subgiant star. However, in 2011 Dumusque and colleagues found a class of K0/K1V, suggesting it is instead a K-type main-sequence star. [4] It is around three billion years old and is spinning with a projected rotational velocity of 2.2 km/s. [6]
The Moon, Io and Earth shown to scale. Although significantly smaller, some of the Solar System's moons and dwarf planets share similarities to Earth's density and temperature. The index can be calculated for objects other than planets, including natural satellites, dwarf planets and asteroids. The lower average density and temperature of these ...
Counter-Earth, a planet situated on the other side of the Sun from that of the Earth. Fifth planet (hypothetical), historical speculation about a planet between the orbits of Mars and Jupiter. Phaeton, a planet situated between the orbits of Mars and Jupiter whose destruction supposedly led to the formation of the asteroid belt. This hypothesis ...
Euler diagram showing the types of bodies orbiting the Sun. The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun.Most named objects in this list have a diameter of 500 km or more.
J1407b is a substellar object, either a free-floating planet or brown dwarf, with a large circumplanetary disk or ring system. It was first detected by automated telescopes in 2007 when its disk eclipsed the star V1400 Centauri, causing a series of dimming events for 56 days. The eclipse by J1407b was not discovered until 2010, by Mark Pecaut ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
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Mariner 9 was the first spacecraft to orbit another planet. It remained active until 27 October 1972. [10] Venera 8 lander Venus 27 March 1972 22 July 1972 landed: 118 days (3 m, 26 d) Venera 8 returned signals from the surface of Venus for 50 minutes. [11] Mars 5 Orbiter: Mars 25 July 1973 12 February 1974 entered orbit: 203 days (6 mo, 19 d)