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Sagittarius A*, abbreviated as Sgr A* (/ ˈ s æ dʒ ˈ eɪ s t ɑːr / SADGE-AY-star [3]), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way.Viewed from Earth, it is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, [7] visually close to the Butterfly Cluster (M6) and Lambda Scorpii.
Sagittarius A (Sgr A) is a complex radio source at the center of the Milky Way, which contains a supermassive black hole. It is located between Scorpius and Sagittarius , and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.
Recent studies derive a distance around 1,250 pc for the M8 region. [8] Erosion of the front of the molecular cloud apparently caused by 9 Sgr suggests that it lies in front of the cloud, but studies of 9 Sgr as a binary star give a distance of 1,790 pc. [4] [9] A 2021 study of the binary system derives a distance of 1,310 ± 60 pc. On this ...
A 2005 study led by Levesque, using a MARCS model, calculated a high luminosity of 363,000 L ☉ for KW Sgr and consequently very large radius of 1,460 R ☉ based on the assumption of an effective temperature of 3,700 K at a distance of 3,000 pc.
One of the most studied stars is S2, a relatively bright star that also passes close by Sgr A*. As of 2020 [update] , S4714 is the current record holder of closest approach to Sagittarius A*, at about 12.6 astronomical units (1.88 × 10 9 km), almost as close as Saturn gets to the Sun, traveling at about 8% of the speed of light.
SGR 1806−20 is a magnetar, a type of neutron star with a very powerful magnetic field, that was discovered in 1979 and identified as a soft gamma repeater. SGR 1806−20 is located about 13 kiloparsecs (42,000 light-years ) [ 1 ] from Earth on the far side of the Milky Way in the constellation of Sagittarius .
These fragments escape from the planet's surface and fall on SGR 1935+2154, creating the X-ray bursts. This planet should be composed of iron, having a mass of 18.1 M E and radius of 1.6 R 🜨 . It has an orbital period of about 238 days, a semi-major axis of 0.85 astronomical units and a very high orbital eccentricity of 0.992.
Delta Sagittarii (δ Sagittarii, abbreviated Delta Sgr, δ Sgr), formally named Kaus Media / ˌ k ɔː s ˈ m iː d i ə /, [10] [11] is a star in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of this star is +2.70, [ 2 ] making it easily visible to the naked eye.