Mu Librae

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Mu Librae
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Libra
Right ascension 14h 49m 19.05130s [1]
Declination −14° 08 56.4766 [1]
Apparent magnitude  (V)5.32 [2] (5.69 + 6.72 [3] + 14.70 [4] )
Characteristics
Spectral type A1pSrCrEu + A6m [3]
B−V color index +0.07 [2]
Astrometry
Radial velocity (Rv)−3.2±1.4 [5]  km/s
Proper motion (μ)RA: −65.95 [1]   mas/yr
Dec.: −14.54 [1]   mas/yr
Parallax (π)13.71 ± 0.69  mas [1]
Distance 240 ± 10  ly
(73 ± 4  pc)
Absolute magnitude  (MV)1.32±0.20 [6]
Details
μ Lib A
Mass 2.31±0.12 [7]   M
Radius 2.59 [8]   R
Luminosity 41.7 [7]   L
Temperature 9,592±260 [7]   K
Rotational velocity (v sin i)29.0±1.7 [7]  km/s
Age 417 [6]   Myr
μ Lib B
Radius 2.59 [8]   R
Rotational velocity (v sin i)32.0±6 [8]  km/s
Other designations
μ Lib, BD−13° 3986, HD  130559, HIP  72489, HR  5523, SAO  158821. [9]
Database references
SIMBAD data

μ Librae (Latinised as Mu Librae) is the Bayer designation for a probable triple star [3] system in the zodiac constellation of Libra. They have a combined apparent visual magnitude of 5.32, [2] which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 13.71  mas, [1] the system is located at an estimated distance of around 240  light years.

The inner pair consists of two A-type stars that, as of 2006, had an angular separation of 1.79  arc seconds along a position angle of 5.5°. [10] They have an estimated physical separation of 139  AU. [8] The primary, component A, is a visual magnitude 5.69 [3] magnetic Ap star showing overabundances of the elements aluminum, strontium, chromium, and europium. [7] Hence, it has a stellar classification of A1pSrEuCr. [3] It is a photometric variable with periods of 25.3992±0.1970 d and 1.8871±0.0008 d. The surface magnetic field strength is 1,375 Gauss. [7]

The secondary, component B, is an Am star with a stellar classification of A6m. [3] It has a visual magnitude of 6.72. [3] The tertiary member, component C, is a magnitude 14.70 star at an angular separation of 12.90 arc seconds along a position angle of 294°, as of 2000. [4]

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References

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