Mu Boötis

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**μ^1,2 Boötis**
Observation data Equinox J2000.0
Constellation	Boötes
Right ascension	15^h 24^m 29.4^s
Declination	+37° 22' 38"
Apparent magnitude (V)	+4.31, +6.51
Distance	121 ± 3 ly (37 ± 1 pc)
Spectral type	F2IVa+G1V
Other designations
Alkalurops, Inkalunis, Icalurus, Clava, Venabulum, 51 Boötis, HR 5733+HR 5734, HD 137391+HD 137392, NN 3903+NN 3904, BD+37°2636+BD 37°2637, FK5 568, HIP 75411+HIP 75415, SAO 64686+SAO 64687, GC 20724+GC 20725, ADS 9626, CCDM 15245+3722

Mu Boötis (μ Boo / μ Boötis) is a triple star system in the constellation Boötes. It also has traditional names Alkalurops (or Inkalunis/Icalurus or Clava or Venabulum), and also has the Flamsteed designation 51 Boötis. Mu Boötis is approximately 121 light-years from Earth.

It is known as 七公六 (the Sixth Star of the Seven Excellencies) in Chinese.

The primary component, μ¹ Boötis, is a yellow-white F-type subgiant with an apparent magnitude of +4.31.

Separated from the primary by 108 arcseconds on the sky is the binary star μ² Boötis, which has a combined spectral type of G1V and a combined brightness of +6.51 magnitudes. The componets of μ² Boötis have apparent magnitudes of +7.2 and +7.8 and are separated by 2.2 arcseconds. They complete one orbit about their common centre of mass every 260 years.