1SWASP J093010.78+533859.5
Quintuple star system in the constellation Ursa Major From Wikipedia, the free encyclopedia
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.[3][5] The star system is located approximately 250 light-years from Earth,[5] and was discovered using data from the "Super Wide Angle Search for Planets" (SuperWASP) project in the Canary Islands.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 30m 10.9127s[1] |
| Declination | +53° 38′ 58.356″[1] |
| Apparent magnitude (V) | 10.98[2] |
| Characteristics | |
| Spectral type | K1V + K5V + K3V + K3V[3] |
| Variable type | Algol + W UMa[4] |
| Astrometry | |
| Proper motion (μ) | RA: -0.737[1] mas/yr Dec.: -12.997[1] mas/yr |
| Parallax (π) | 14.2625±0.0165 mas[1] |
| Distance | 228.7 ± 0.3 ly (70.11 ± 0.08 pc) |
| Details[5] | |
| 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[2] | |
| Database references | |
| SIMBAD | data |
Description
1SWASP J093010.78+533859.5 consists of two pairs of stars, designated J093010A and J093010B respectively, as well as a fifth star. The first pair of stars, J093010A, is a detached eclipsing binary (an Algol variable). The two stars within J093010A orbit with a period of about 1.3 days and are separated by about 5.8 solar radii.[5] The second pair of stars, J093010B is a W Ursae Majoris variable; in this pair the two stars are so close as to be touching each other. The two stars within J093010B take about 5.5 hours (0.2277 days) to orbit each other.[4]
The two pairs J093010A and J093010B are separated by about 1.89 arcseconds, so the separation between the two pairs is likely about 130 astronomical units. The fifth star was detected based on stationary spectral lines coming from the direction of 1SWASP J093010.78+533859.5. The fifth star likely orbits J093010A at a further distance than the eclipsing binary.[3]
The five stars are connected by gravity and therefore do not form separate systems. No planets have yet been discovered in the system.[6]
See also
References
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