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| NGC 1624 | |
|---|---|
 Image of NGC 1624 with theIsaac Newton Telescope Credit: IGAPS | |
| Observation data (J2000epoch) | |
| Right ascension | 04h 40m 36.0s[1] |
| Declination | +50° 27′ 42″[1] |
| Distance | 20000 ± 2000 ly (6000 ± 600 pc[2]) |
| Apparent magnitude (V) | 11.8[1] |
| Physical characteristics | |
| Estimated age | <4 Myr[2] |
| Other designations | Cr 53, C 0436+503, OCl 403, Tribble Nebula, Little Cocoon Nebula |
| Associations | |
| Constellation | Perseus |
| See also:Open cluster,List of open clusters | |
NGC 1624, also known as Sh 2-212[3] in theSharpless catalog, is a very youngopen cluster in the constellationPerseus inside anemission nebula. It was discovered by German-British astronomerWilliam Herschel in 1790.[4] Together with Sh 2-211, this nebula is part of theTribble Nebulae.[5]NGC 1624 is about 20,000 ly (6,000 pc) from Earth, and latest estimates give it an age of less than 4 million years.[2] Itsapparent magnitude is 11.8,[1] andapparent diameter is about 3.0 arc minutes.[4] Its celestial location isright ascension (α)04h 40m 36.0s anddeclination (δ) +50° 27′ 42″.[1] It is potentially an area of massivestar formation.[6]
According toRobert Trumpler's classification of open clusters, this cluster contains fewer than 50 stars (letter p) with a high concentration (I) and whose magnitudes are distributed over an average interval (number 2). The letter n at the end (I2pn) means that the cluster is inside a nebula.
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