NGC 1624-2
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| 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 | |
| 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] |
| Distance | 5,152.3[5] pc |
| Details | |
| Mass | 34[5] M☉ |
| Radius | 10[5] R☉ |
| Luminosity | 126,000[5] L☉ |
| Surface gravity (log g) | 3.55[1] cgs |
| Temperature | 35,000[5] K |
| Metallicity [Fe/H] | +0.07[1] dex |
| Rotation | 315.98 d[6] |
| Rotational velocity (v sin i) | <3[5] km/s |
| Other designations | |
| TYC 3350-255-1, ALS 18660, 2MASS J04403728+5027410 | |
| Database references | |
| SIMBAD | data |
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]
