1SWASP J093010.78+533859.5
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 30m 10.9127s |
| Declination | +53° 38′ 58.356″ |
| Apparent magnitude (V) | 10.98 |
| Characteristics | |
| Spectral type | K1V + K5V + K3V + K3V |
| Variable type | Algol + W UMa |
| Astrometry | |
| 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) |
| Details | |
| J093010Aa | |
| Mass | 0.837 ± 0.008 M☉ |
| Radius | 0.832 ± 0.018 R☉ |
| Surface gravity (log g) | 4.52 cgs |
| Temperature | 5185+25 −20 K |
| J093010Ab | |
| Mass | 0.674 ± 0.007 M☉ |
| Radius | 0.669 ± 0.018 R☉ |
| Surface gravity (log g) | 4.62 cgs |
| Temperature | 4325+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 | 4700 ± 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 | 4700 ± 50 K |
| Other designations | |
| V442 UMa, TYC 3807-759-2 | |
| Database references | |
| SIMBAD | data |
1SWASP J093010.78+533859.5 (abbreviated as J093010), also known as V441/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.