LS I +61 303
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 02h 40m 31.6643s |
| Declination | +61° 13′ 45.592″ |
| Apparent magnitude (V) | 10.61–10.83 |
| Characteristics | |
| Spectral type | B0Ve |
| U−B color index | −0.34 |
| B−V color index | +0.86 |
| Variable type | High-mass X-ray binary |
| Astrometry | |
| Radial velocity (Rv) | −41.41 km/s |
| Proper motion (μ) | RA: 0.27 mas/yr Dec.: 2.38 mas/yr |
| Parallax (π) | 0.45±0.23 mas |
| Distance | approx. 7,000 ly (approx. 2,000 pc) |
| Other designations | |
| V615 Cas, 1RXS J024033.5+611358, TYC 4047-1917-1, HIP 12469 | |
| Database references | |
| SIMBAD | data |
LS I +61 303 is a binary system containing a massive star and a compact object. The compact object is a pulsar and the system is around 7,000 light-years away.