US 708
US 708 is a hyper-velocity O class subdwarf in Ursa Major in the halo of the Milky Way Galaxy. One of the fastest-moving stars in the galaxy, the star was first surveyed in 1982.
Artist's concept of US 708 (the blue star on the left) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 33m 20.865s |
| Declination | +44° 17′ 05.52″ |
| Apparent magnitude (V) | 18.8 |
| Characteristics | |
| Spectral type | sdOHe |
| Astrometry | |
| Radial velocity (Rv) | 708.0 ± 15.0 km/s |
| Proper motion (μ) | RA: −7.33 ± 0.58 mas/yr Dec.: 2.28 ± 0.55 mas/yr |
| Distance | 60,300 ± 8,500 ly (18,500 ± 2,600 pc) |
| Details | |
| Surface gravity (log g) | 5.23 ± 0.12 cgs |
| Temperature | 44561 ± 675 K |
| Other designations | |
SDSS J093320.86+441705.4 | |
| Database references | |
| SIMBAD | data |
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