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Nemesis is a hypothetical red dwarf [1] or brown dwarf, [2] originally postulated in 1984 [3] to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), [2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.
It also has the largest relativistic perihelion shift of any object orbiting the Sun, 1.6 times that of Mercury. [8] With an absolute magnitude of 17.7, the asteroid is estimated to be larger than 1 kilometer (0.6 miles) in diameter.
2017 MB 7 orbits the Sun at a distance of 4.5–3,419 AU once every 70,825 years (semi-major axis of 1712 AU). Its orbit has an eccentricity of 0.9974 and an inclination of 56° with respect to the ecliptic. [2] As it has an eccentricity higher than 0.50, the distant object is labelled an (other) unusual object by the Minor Planet Center. [4]
3200 Phaethon (/ ˈ f eɪ. ə ˌ θ ɒ n /; previously sometimes spelled Phæton), provisionally designated 1983 TB, is an active [8] Apollo asteroid with an orbit that brings it closer to the Sun than any other named asteroid (though there are numerous unnamed asteroids with smaller perihelia, such as (137924) 2000 BD 19). [9]
An asteroid capable of flattening a mid-sized city could potentially collide with Earth eight years from now, as its orbit around the sun briefly intersects the path of our planet. Named 2024 YR4 ...
Kalpanachawla is a member the Eos family (), [3] the largest family in the outer asteroid belt consisting of nearly 10,000 asteroids. [5]: 23 It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.3 AU once every 5 years and 5 months (1,968 days; semi-major axis of 3.07 AU).
A small asteroid will be pulled into orbit around the Earth as a “mini-moon” later this month before the space rock departs into other parts of the solar system.. The 10m-wide asteroid, dubbed ...
622 Esther is a minor planet orbiting the Sun. The asteroid is named after the biblical figure Esther. [1] In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.11 AU. The resulting data yielded an effective diameter of 29 ± 8 km. [3]