HD 130144
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 46m 05.94566s[1] |
| Declination | +15° 07′ 54.4332″[1] |
| Apparent magnitude (V) | 5.82[2] |
| Characteristics | |
| Spectral type | M5III[3] |
| U−B color index | +1.26[2] |
| B−V color index | +1.50[2] |
| Variable type | Lb[4] |
| Astrometry | |
| Radial velocity (Rv) | −22.52±0.65[5] km/s |
| Proper motion (μ) | RA: −85.49[1] mas/yr Dec.: +18.86[1] mas/yr |
| Parallax (π) | 4.04 ± 0.38[1] mas |
| Distance | 810 ± 80 ly (250 ± 20 pc) |
| Details | |
| Radius | 210±21[3] R☉ |
| Luminosity | 5,587[6] L☉ |
| Temperature | 3,333[6] K |
| Rotational velocity (v sin i) | 11[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 130144 (or EK Boötis) is a semiregular variable star in the northern constellation of Boötes. The variation in luminosity has an amplitude of 0.38 in magnitude with no apparent periodicity. This is an X-ray source, and was possibly the first M-type giant star to have a magnetic field directly detected. It is considered to be a single star,[3] although there is nearby companion at an angular separation of 0.2023″ along a position angle of 82.2° (as of 2010.4812).[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
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