Cygnus OB9 is an OB association in Cygnus. It is near to the Cygnus OB2 association. The region is embedded within a wider one of star formation known as Cygnus X, which is one of the most luminous objects in the sky at radio wavelengths. The region is approximately 5,000 light years from Earth in the constellation of Cygnus.

Although Cygnus OB9 has many O and B type stars, Cygnus OB9 is also hidden behind a massive dust cloud known as the Cygnus Rift like Cygnus OB2.

+Prominent starsStar nameSpectral typeMTemperature (K)Mass ()V2245 Cygni (HD 229196)O5−6.1940,86261.6ALS 11244O5If−5.4238,61240.1BD+39 4177O6.5−5.5137,87039.3HD 229250O7−5.2836,87233.9BD+39 4168O7−5.4036,87237.3HD 229202O8V−4.6634,87725.0HD 228929B0.5Ib−5.6022,53720.5HD 193945B0Vnn−5.1130,11023.8RIC 13431720 B1Ia−5.9119,97920.5HD 193426B9Ia−6.7110,50015.4

See also

List of most massive stars

References