NGC 2204
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NGC 2204 is an open cluster of stars in the Canis Major constellation. It was discovered by the German-English astronomer William Herschel on 6 February 1785.[1] The cluster has an integrated visual magnitude of 8.6 and spans a diameter of Template:Val. Resolving the individual member stars is a challenge with a 10 to 12-inch amateur telescope.[2] It is located at a distance of approximately 13,400 light years from the Sun.[3] The cluster shows a mean radial velocity of Template:Val relative to the Sun,[4] and is orbiting the inner galactic disk region about 1 kpc below the galactic plane.[3]
This is a rich but diffuse cluster with a Trumpler class of III 3m,[5][6] spanning a physical diameter of about Template:Cvt.[7] It is an older cluster with an estimated age of Template:Val.[8] The metallicity is correspondingly poor,[9][6] showing an abundance of iron about 59% of that in the Sun.[3] There is a prominent giant branch clump on the HR diagram.[5] The cluster has a significant population of blue stragglers,[10][9] an indicator of past stellar mergers. It has a pair of candidate chemically peculiar stars,[6] and five variable stars have been discovered, including four eclipsing variables.[7]
References
External links
Template:Astronomical catalogs Template:NGC objects:2000-2499 Template:Canis Major Template:Sky
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