HD 130144

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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
EK Boötis, BD+15° 2758, FK5 3168, HD 130144, HIP 72208, HR 5512, SAO 101200.
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

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External links

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