Butterfly Cluster
Open cluster in the constellation Scorpius
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Summary
Butterfly Cluster is an open cluster[1].
Key Facts
- Discoverer or inventor: Giovan Battista Hodierna[2]
- Constellation: Scorpius[3]
- Spectral class: II[4]
- Part of: Orion Arm[5]
- Catalog code: M 6[6], NGC 6405[7], C 1736-321[8], OCl 1030.0[9], Collinder 341[10], Melotte 178[11], [KPS2012] MWSC 2661[12]
- Time of discovery or invention: 1654[13]
- Apparent magnitude: {'amount': '+4.2'}[14], {'amount': '+4.48'}[15]
- Different from: M6[16]
- Radius: 6 light-year[17]
- Parallax: 2.1626 milliarcsecond[18]
- Radial velocity: -9.20 kilometre per second[19]
- Metallicity: {'amount': '+0.07'}[20]
- Distance from Earth: 0.4 kiloparsec[21]