Mu Boötis

Mu Boötis
μ1,2 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 15h 24m 29.4278s
Declination +37° 22′ 37.8″
Apparent magnitude (V) 4.397 / 6.5
Characteristics
Spectral type F0V / G1V
U−B color index 0.07 / 0.13
B−V color index 0.31 / 0.59
R−I color index 0.15 /
Variable type Variable star
Astrometry
Radial velocity (Rv) -12.5 km/s
Proper motion (μ) RA: -147.68 mas/yr
Dec.: 84.69 mas/yr
Parallax (π) 26.96 ± 0.65 mas
Distance 121 ± 3 ly
(37.1 ± 0.9 pc)
Absolute magnitude (MV) 4.598 /
Details
Mass 3–4 M
Radius 130 R
Luminosity 1,900 L
Temperature 3,350 K
Rotational velocity (v sin i) 84 km/s
Orbit
Companion CCDM 15245+3722 C
Period (P) 260.1 yr
Semimajor axis (a) 1.463"
Eccentricity (e) 0.59
Inclination (i) 135.4°
Longitude of the node (Ω) 174.9°
Periastron epoch (T) 1865
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.
Database references
SIMBAD data
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)
Database references
SIMBAD data

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

The name Alkalurops is from Greek καλαύροψ kalaurops "shepherd's staff", through the Arabic.

It is known as 七公六 (the Sixth Star of the Seven Excellencies) in Chinese[1].

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

Contents

Position

Mu1,2 Boötis

Separated from the primary by 108 arcseconds in 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 components 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.

See also

References

Components

NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
ADS 9626 B (ADS 9626 Aa) 15h 24m 36s +37° 23' Simbad
ADS 9626 C (CCDM J15245+3722BC) 15h 24m 30.8663s +37° 20' 50.28 6.5 G1V Simbad



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