Sedna (dwarf planet) - Wikipedia
Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun beyond the orbit of Neptune. Discovered in 2003, the planetoid's surface is one of the reddest known among Solar System bodies.
賽德娜 (小行星) - 维基百科，自由的百科全书
它於2003年11月14日由 天文學家 布朗 （加州理工學院）、 特魯希略 （雙子星天文臺）及 拉比諾維茨 （耶魯大學）共同發現，它被發現時是 太陽系 中距離 地球 最遠的大型天然天體。 賽德娜目前距離 太陽 88 天文單位 [8]，為 海王星 與太陽之間距離的3倍。 在賽德娜大部分的公轉週期中，它與太陽之間的距離比任何已知的 矮行星候選 都要遙遠。 賽德娜是太陽系中颜色最紅的天體之一。 它大部分由 水 、 甲烷 、 氮冰 及 托林 （Tholin）所構成。 國際天文聯會 目前並未將賽 …
Sedna | Trans-Neptunian Object, Dwarf Planet & Kuiper Belt
2024年10月11日 · Sedna, small body in the outer solar system that may be the first discovered object from the Oort cloud. Sedna was discovered in 2003 by a team of American astronomers at Palomar Observatory on Mount Palomar, California. At that time, it was the most distant object in the solar system that had ever
Sedna Is So Distant, We're Not Even Sure It's a Dwarf Planet
2023年6月14日 · Sedna, spherical in shape and with a distinct orbit, fits this description and is generally considered by astronomers to be a dwarf planet candidate, yet it shares its orbital zone with numerous other trans-Neptunian objects, disqualifying it from full planet status.
The Dwarf Planet Sedna: Discovery and Facts - ThoughtCo
2020年1月22日 · Sedna is dwarf planet out far beyond Pluto. Here's what we know about Sedna so far and a look at what we suspect is true.
Sedna Facts - The Planets
2003年11月14日 · Sedna is categorized as a minor planet since its orbit takes it directly around the sun. The distant world is up for consideration as a dwarf planet, however for this to happen, scientists would have to prove that the planetoid is in hydrostatic equilibrium.
The Dwarf Planet Sedna - Universe Today
2015年8月10日 · Sedna, which was discovered in the outer reaches of the Solar System in 2003, is most likely a dwarf planet. And as the furthest known object from the Sun, and located within the hypothetical...
90377 Sedna Asteroid Mass, Discovery and other Facts
90377 Sedna (2003 VB12) is a Dwarf Planet, located in the Kuiper Belt, an area of space past the orbit of Neptune. It has been categorised as a Trans-Neptunian object. Sedna's name and number is allocated to it by the Minor Planet Center (MPC), part …
Sedna: Possible Dwarf Planet Far From the Sun | Space
2014年4月30日 · Sedna is a solar system body that is one of the most distant bodies found in our solar system. The object's closest approach to the sun is far greater than Pluto's distance away from Earth —...
Sedna (2003 VB12) - Division of Geological and Planetary Sciences
Sedna is the most distant solar system object ever discovered. It is twice as far from the sun as any other solar system object and three times farther than Pluto or Neptune. Standing on the surface of Sedna, you could block the entire sun with the head of a pin held at arm's length.