BD+60 2522

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NGC 7635HSTFull.jpg
BD+60 2522 showing a portion of the surrounding Bubble Nebula
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 23h 20m 44.5203s
Declination +61° 11′ 40.561″
Apparent magnitude (V) 8.71
Spectral type O6.5(f)(n)p
U−B color index -0.58
B−V color index 0.33
Variable type None
Radial velocity (Rv) −26 km/s
Proper motion (μ) RA: 3.1 mas/yr
Dec.: 4.6 mas/yr
Parallax (π) 13.0 ± 8.0 mas
Distance 2.4[1]k pc
Absolute magnitude (MV) -5.5[1]
Mass 44[2] M
Radius 15 R
Luminosity 398,000[2] L
Temperature 37,500[2] K
Rotation 178-240[2]
Other designations
SAO 20575 IRAS 23185+6055 2MASS J23204452+6111404
Database references

BD+60°2522 is a bright O-class star that has produced the Bubble Nebula (NGC 7635) with its stellar wind. The exact classification of the star is uncertain, with a number of spectral peculiarities and inconsistencies between the appearance of the star itself and the effects on the nearby nebulosity, but it is undoubtedly a highly luminous hot massive star.[1] Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around 37,500K.


  1. ^ a b c Moore, B. D.; Walter, D. K.; Hester, J. J.; Scowen, P. A.; Dufour, R. J.; Buckalew, B. A. (2002). "\ITAL]Hubble Space Telescope\/ITAL] Observations of the Windblown Nebula NGC 7635". The Astronomical Journal 124 (6): 3313. doi:10.1086/344596. 
  2. ^ a b c d Rauw, G.; De Becker, M.; Vreux, J. -M. (2003). "Line profile variability in the spectra of Oef stars". Astronomy and Astrophysics 399: 287. doi:10.1051/0004-6361:20021776.