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The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum.It is catalogued as Messier 33 or NGC 598.With the D 25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way.
The Horsehead Nebula (also known as Barnard 33 or B33) is a small dark nebula in the constellation Orion. [2] The nebula is located just to the south of Alnitak , the easternmost star of Orion's Belt , and is part of the much larger Orion molecular cloud complex .
33 is the 21st composite number, and 8th distinct semiprime (third of the form where is a higher prime). [1] It is one of two numbers to have an aliquot sum of 15 = 3 × 5 — the other being the square of 4 — and part of the aliquot sequence of 9 = 3 2 in the aliquot tree (33, 15, 9, 4, 3, 2, 1).
Messier number NGC/IC number Common name Image Object type Distance Constellation Apparent magnitude Apparent dimensions Right ascension Declination; M1 [17] NGC 1952 Crab Nebula: Supernova remnant: 4.9–8.1 Taurus: 8.4 420″ × 290″ 05 h 34 m 31.94 s +22° 00′ 52.2″ M2 [18] NGC 7089 – Globular cluster: 33: Aquarius: 6.5 16' 21 h 33 m ...
M33 X-7 is a black hole binary system in the Triangulum Galaxy.The system is made up of a stellar-mass black hole and a companion star. The black hole in M33 X-7 has an estimated mass of 15.65 times that of the Sun (M ☉) [3] [4] (formerly the largest known stellar black hole, though this has now been superseded amongst electromagnetically-observed black holes by an increased mass estimate ...
A blue band light curve for GR 290, adapted from Polcaro et al. (2016) [2]. Analysis of historical records show that Romano's Star was likely quiescent from 1900 until five outbursts occurred between 1960 and 2010.
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Kepler-33 is a star about 4,000 light-years (1,200 parsecs) in the constellation of Cygnus, with a system of five known planets.Having just begun to evolve off from the main sequence, [4] its radius and mass are difficult to ascertain, although data available in 2020 shows its best-fit mass of 1.3M ☉ and radius of 1.6R ☉ are compatible with a model of a subgiant star.