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Messier 80 (also known as M80 or NGC 6093) is a globular cluster in the constellation Scorpius. It was discovered by Charles Messier in 1781, being one of his first discoveries. [9] This star cluster is, as to its angle from the solar system, midway between α Scorpii and β Scorpii in a field in the Milky Way Galaxy that is rich in nebulæ.
Open cluster: Messier 4: 75 [27] Globular cluster: Nearest globular cluster to the Earth. Also the first globular cluster known to have exoplanets (PSR B1620-26b) Messier 12: 74.4 [28] Messier 70: 68 [29] NGC 290: 66 [30] Open cluster: Messier 28: 60 [31] Globular cluster: Messier 18: 52.4 [32] Open cluster: The following notable star clusters ...
The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...
Mercer (for example: globular star cluster Mercer 3 in Scutum) MGC (globular star clusters) (for example: MGC1 in Pisces) Mh — O.M. Mitchel (double stars) Mil — J.A. Miller (double stars) Miller (open star clusters) (for example: Miller 1 at 9:25:42 / -53°14'00", near the variable star GL Velorum, in Vela) Milb — W. Milburn (double stars)
A star system 3,000 light-years away from Earth is predicted to become visible to the naked eye this year — likely a once-in-a-lifetime viewing opportunity, as the phenomenon only occurs roughly ...
The light curve of T Scorpii, plotted from measurements by Arthur von Auwers [3]. T Scorpii, or Nova Scorpii 1860, was a nova in the globular cluster Messier 80 (M80). It was discovered on 21 May 1860 by Arthur von Auwers at Koenigsberg Observatory and was independently discovered by Norman Pogson on May 28 at Hartwell observatory.
The structure consists of 11th-magnitude stars and is approximately 2.5' long and was first noted by William Herschel in 1783. At least 43 variable stars have been observed within M4. [9] M4 is approximately 6,000 light-years away, [10] making it the closest globular cluster to the Solar System. It has an estimated age of 12.2 billion years. [7]
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. It has a D 25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years ).