NGC 2506 (also known as Caldwell 54) is a mildly-elongated[6] open cluster of stars in the equatorial constellation of Monoceros, located at a distance of 12.7 kly[2] from the Sun near the Galactic anti-center.[4] It was discovered by William Herschel in 1791.[7] The cluster lies around 10,000 ly from the Galactic Center and about 1,600 ly above the Galactic plane.[4] It is of intermediate age,[2] estimated at around two billion years.[2] The cluster has an angular radius of 12′ and a core radius of 4.8′.[8]
At least 94 probable members have been identified within the field of NGC 2506 based upon their radial velocities. Compared to the Sun, the cluster is moderately metal-poor with an iron abundance of [Fe/H] = –0.3 dex.[9] It shows indications of mass segregation, with the lower mass members being more likely to be in the outer parts of the cluster. This is the result of exchange of kinetic energy during encounters between the members.[10] Twelve blue straggler stars have been located in the cluster, with three of them showing short-period oscillation. Fourteen Gamma Doradus variables have been found, as well as two detached eclipsing binaries,[6] and three Delta Scuti stars.[11]
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NGC2506 (also known as Caldwell 54) is a mildly-elongated open cluster of stars in the equatorial constellation of Monoceros, located at a distance of...
objects, such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253). The Messier catalogue was actually compiled...
September 2012). "Deep and wide photometry of the two open clusters NGC 1245 and NGC2506: CCD observation and physical properties". Monthly Notices of the...
II Program. The catalogue contains 400 objects. All objects are from the NGC. All objects are visible in mid northern latitudes, since they were all observed...
"Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682". Astronomy and Astrophysics. 470 (3): 919–926. Bibcode:2007A&A...
"Comprehensive abundance analysis of red giants in the open clusters NGC 752, 1817, 2360 and 2506", Monthly Notices of the Royal Astronomical Society, 419 (2):...
Embedded within Messier 24. Associated with Messier 17. Associated with NGC 6820. Embedded within the Iris Nebula. There are some errors in Collinder's...
NGC 2903 is an isolated barred spiral galaxy in the equatorial constellation of Leo, positioned about 1.5° due south of Lambda Leonis. It was discovered...
NGC 2950 is a lenticular galaxy in the northern constellation of Ursa Major, about 50 million light years from the Milky Way and receding with a heliocentric...
NGC 2800, also known as PGC 26302, is an elliptical galaxy in the constellation Ursa Major. It was discovered February 17, 1831 by William Herschel. Skrutskie...
NGC 2509 is an open cluster in the constellation of Puppis. It was discovered on 3 December 1783 by William Herschel. It was described as "bright, pretty...
NGC 2803, also known as PCG 26181, is an elliptical or lenticular galaxy in the zodiac constellation Cancer. It was discovered March 21, 1784, by William...
ruler". Monthly Notices of the Royal Astronomical Society. 437 (3): 2488–2506. arXiv:1310.6810. Bibcode:2014MNRAS.437.2488B. doi:10.1093/mnras/stt2062...
film White Squall. Led by Manuel Artime, a group of 22 members of Brigade 2506, in hiding since the failure of the April 17 Bay of Pigs Invasion of Cuba...
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