NGC 2129

open cluster

Key facts

Right ascension: 06 01 06.5
Declination: +23 ° 10 ′ 20 ″
Distance: 7,200 ly (2,200 pc )
Apparent dimensions v: 2.5 MOA
Estimated age: 10 Myr
Other designations: NGC 2129, C 0558+233, OCl 467, OCISM 10, KPR2004b 84.
Constellation: Gemini

via Wikipedia infobox

Wikidata facts

Distance from Earth: 1515
Image: NGC 2129 DSS.jpg

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catalog code: [KPS2012] MWSC 0704
time of discovery or invention: 1784-11-16
apparent magnitude: 6.7
Commons category: NGC 2129
right ascension: 90.2792
declination: 23.3217
radial velocity: 11.8
right ascension component of proper motion: -0.71
declination component of proper motion: -1.53

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Article

NGC 2129 is an open cluster in the constellation Gemini. It has an angular diameter of 2.5 arcminutes and is approximately 2.2 ± 0.2 kpc (~7,200 light years) from the Sun inside the Local spiral arm. At that distance, the angular size of the cluster corresponds to a diameter of about 10.4 light years. NGC 2129 is a very young cluster whose age has been estimated at 10 million years. It was discovered by William Herschel on November 16, 1784

The group is dominated by two close B-Type stars, HD 250289 (B2III) and HD 250290 (B3I). With the two stars sharing the same proper motion and radial velocity it is likely that the two constitute a binary system.