NGC 1624, also known as Sh2-212[3] in the Sharpless catalog, is a very young open cluster in the constellation Perseus inside an emission nebula. It was discovered by German-British astronomer William Herschel in 1790.[4] 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] Its apparent magnitude is 11.8,[1] and apparent diameter is about 3.0 arc minutes.[4] Its celestial location is right ascension (α) 04^h 40^m 36.0^s and declination (δ) +50° 27′ 42″.[1] It is potentially an area of massive star formation.[5]

This article includes a list of general references, but it lacks sufficient corresponding inline citations. (November 2017)

NGC 1624
Image of NGC 1624 Credit: DSS
Observation data (J2000 epoch)
Constellation	Perseus
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
See also: Open cluster, List of open clusters

According to Robert 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.

Along with nearby emission nebula Sh2-211[6] it makes up what has become known as the Tribble Nebulae,[7] so called because they look like the furry creatures first introduced in the Star Trek episode "The Trouble with Tribbles".

References

External links

• Media related to NGC 1624 at Wikimedia Commons
• NGC 1624 spider.seds.org
• NGC 1624
• Sh2-211
• Sh2-212

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