1SWASP J093010.78+533859.5
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| A | |
| Right ascension | 09h 30m 10.7410s |
| Declination | +53° 38′ 59.825″ |
| Apparent magnitude (V) | 9.84 |
| B | |
| Right ascension | 09h 30m 10.9127s |
| Declination | +53° 38′ 58.356″ |
| Apparent magnitude (V) | 10.98 |
| Characteristics | |
| A | |
| Spectral type | K1V + K5V |
| Variable type | Algol |
| B | |
| Spectral type | K3V + K3V |
| Variable type | W UMa |
| Astrometry | |
| A | |
| Radial velocity (Rv) | 12.24±0.17 km/s |
| Distance | 250±9.8 ly (78±3 pc) |
| B | |
| Proper motion (μ) | RA: −0.737 mas/yr Dec.: −12.997 mas/yr |
| Parallax (π) | 14.2625±0.0165 mas |
| Distance | 228.7 ± 0.3 ly (70.11 ± 0.08 pc) |
| Orbit | |
| Primary | Aa |
| Name | Ab |
| Period (P) | 31.333 hours |
| Semi-major axis (a) | 5.762±0.010 R☉ |
| Eccentricity (e) | 0 |
| Inclination (i) | 88.2±0.3° |
| Orbit | |
| Primary | Ba |
| Name | Bb |
| Period (P) | 5.465 hours |
| Semi-major axis (a) | 1.665±0.012 R☉ |
| Eccentricity (e) | 0 |
| Inclination (i) | 86±4° |
| Details | |
| J093010Aa | |
| Mass | 0.837±0.008 M☉ |
| Radius | 0.832±0.018 R☉ |
| Surface gravity (log g) | 4.52 cgs |
| Temperature | 5,185+25 −20 K |
| J093010Ab | |
| Mass | 0.674±0.007 M☉ |
| Radius | 0.669±0.018 R☉ |
| Surface gravity (log g) | 4.62 cgs |
| Temperature | 4,325+20 −15 K |
| J093010Ba | |
| Mass | 0.86±0.02 M☉ |
| Radius | 0.79±0.04 R☉ |
| Luminosity | 6.20±0.05 L☉ |
| Surface gravity (log g) | 4.58 cgs |
| Temperature | 4,700±50 K |
| J093010Bb | |
| Mass | 0.341±0.011 M☉ |
| Radius | 0.52±0.05 R☉ |
| Luminosity | 7.12±0.05 L☉ |
| Surface gravity (log g) | 4.53 cgs |
| Temperature | 4,700±50 K |
| Other designations | |
| RX J0930.1+5339, WDS J09302+5339 | |
| A: V441 UMa, TYC 3807-759-1 | |
| B: V442 UMa, TYC 3807-759-2 | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
1SWASP J093010.78+533859.5 (abbreviated as J093010), also known as V441 Ursae Majoris and V442 Ursae Majoris is a quintuple star system located in the constellation Ursa Major. The star system is located approximately 250 light-years from Earth, and was discovered using data from the "Super Wide Angle Search for Planets" (SuperWASP) project in the Canary Islands.