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HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
PSR B1620-26 b orbits a pair of stars.The primary star, PSR B1620-26, is a pulsar, a neutron star spinning at 100 revolutions per second, with a mass of 1.34 M ☉, a likely radius of around 20 kilometers (0.00003 R ☉) and a likely temperature less than or equal to 300,000 K.
The age of the oldest known stars approaches the age of the universe, about 13.8 billion years. Some of these are among the first stars from reionization (the stellar dawn), ending the Dark Ages about 370,000 years after the Big Bang. [1] This list includes stars older than 12 billion years, or about 87% of the age of the universe.
The subgiant star HD 140283, believed to be the oldest extant star discovered, is often nicknamed "The Methuselah Star" after the ancient biblical figure. [45] The name is also used to refer to the exoplanet PSR B1620−26 b , which is one of the oldest known exoplanets with an estimated age of 12.7 billion years old.
It is the 2nd/3rd nearest individual star to the Solar System, and the fourth-brightest individual star in the night sky. Has one candidate exoplanet. Tau Ceti: 11.912 ± 0.007: G8V [76] 0.793 ± 0.004 [120] [121] 0.800 ± 0.008 [121] 3.5 [120] 5.68 [120] Also the 20nd nearest star system to the Solar System. Eta Cassiopeiae A (Achird) 19.42 ...
A star is a massive luminous spheroid astronomical object made of plasma that is held together by its own gravity.Stars exhibit great diversity in their properties (such as mass, volume, velocity, stage in stellar evolution, and distance from Earth) and some of the outliers are so disproportionate in comparison with the general population that they are considered extreme.
PSR B1620−26 b was originally detected through the Doppler shifts its orbit induces on signals from the star it orbits (in this case, changes in the apparent pulsation period of the pulsar). In the early 1990s, a group of astronomers led by Donald Backer, studying what they thought was a binary pulsar, determined that a third object was ...
200 million years: HD 140283, the "Methuselah" Star, formed, the unconfirmed oldest star observed in the Universe. Because it is a Population II star, some suggestions have been raised that second generation star formation may have begun very early on. [7] The oldest-known star (confirmed) – SMSS J031300.36−670839.3, forms.