Messier 18

Summary

Messier 18 is an open cluster^[1]. It draws 15 Wikipedia views per month (open_cluster category, ranking #29 of 108).^[2]

Key Facts

• Messier 18 is credited with the discovery of Charles Messier^[3].
• Messier 18's image is recorded as Messier18.jpg^[4].
• Messier 18's image is recorded as Eso1628a-crop.png^[5].
• Messier 18's instance of is recorded as open cluster^[6].
• Messier 18's constellation is recorded as Sagittarius^[7].
• Messier 18's spectral class is recorded as II^[8].
• Messier 18's part of is recorded as Milky Way^[9].
• Messier 18's Commons category is recorded as Messier 18^[10].
• Messier 18's catalog code is recorded as M 18^[11].
• Messier 18's catalog code is recorded as NGC 6613^[12].
• Messier 18's catalog code is recorded as OCl 40^[13].
• Messier 18's catalog code is recorded as Collinder 376^[14].
• Messier 18's catalog code is recorded as C 1817-171^[15].
• Messier 18's catalog code is recorded as OCISM 8^[16].
• Messier 18's catalog code is recorded as [KPS2012] MWSC 2892^[17].
• Messier 18's time of discovery or invention is recorded as +1764-06-03T00:00:00Z^[18].
• Messier 18's Freebase ID is recorded as /m/03tmvm^[19].
• Messier 18's topic's main category is recorded as Category:Messier 18^[20].
• Messier 18's Commons gallery is recorded as Messier 18^[21].
• Messier 18's apparent magnitude is recorded as {'amount': '+7.24'}^[22].
• Messier 18's apparent magnitude is recorded as {'amount': '+6.9'}^[23].
• Messier 18's radius is recorded as {'unit': 'Q531', 'amount': '+9'}^[24].
• Messier 18's radial velocity is recorded as {'unit': 'Q3674704', 'amount': '-14.0'}^[25].
• Messier 18's distance from Earth is recorded as {'unit': 'Q12129', 'amount': '+1296'}^[26].
• Messier 18's SIMBAD ID is recorded as M 18^[27].

Body

Geography

Messier 18's part of is recorded as Milky Way^[9].

Designation and Status

Messier 18's instance of is recorded as open cluster^[6].

History and Context

Catalog codes include M 18^[11], NGC 6613^[12], OCl 40^[13], Collinder 376^[14], C 1817-171^[15], and OCISM 8^[16].

Why It Matters

Messier 18 draws 15 Wikipedia views per month (open_cluster category, ranking #29 of 108).^[2] It has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.^[28] It is known by 6 alternative names across languages and contexts.^[29]