NGC 1624-2

NGC 1624-2

NGC 1624-2 is the brightest star at the centre of NGC 1624 on the left of this image spanning about one degree.
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 40m 37.276s[1]
Declination 50° 27′ 41.04″[1]
Apparent magnitude (V) 11.57[2]
Characteristics
Evolutionary stage O-type star
Spectral type O7f?cp[3]
U−B color index −0.57[2][4]
B−V color index 0.9[2]
Astrometry
Proper motion (μ) RA: 0.025[1] mas/yr
Dec.: 0.108[1] mas/yr
Parallax (π)−0.3521 ± 0.1716 mas[1]
Distance5,152.3[5] pc
Details
Mass34[5] M☉
Radius10[5] R☉
Luminosity126,000[5] L☉
Surface gravity (log g)3.55[1] cgs
Temperature35,000[5] K
Metallicity [Fe/H]+0.07[1] dex
Rotation315.98 d[6]
Rotational velocity (v sin i)<3[5] km/s
Other designations
TYC 3350-255-1, ALS 18660, 2MASS J04403728+5027410
Database references
SIMBADdata

NGC 1624-2 is a massive O-type star located in the star cluster NGC 1624, in the constellation of Perseus, about 16,800 light years away. NGC 1624-2 is notable for being most strongly magnetised O-type star known,[6] with a magnetic field strength of 20 kG, or about 20,000 times the Sun's magnetic field strength.[5] It hosts a large and dense magnetosphere, formed from the interaction between its very strong magnetic field and its dense, radiatively-driven stellar wind, which also absorbs up to 95% of x-rays generated from around the star.[5]

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  2. ^ a b c Cite error: The named reference tyc was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gosss was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference als was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference wade was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference daviduraz was invoked but never defined (see the help page).