Mu Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 24m 29.4278s |
| Declination | +37° 22′ 37.8″ |
| Apparent magnitude (V) | 4.31[1] / 6.5 |
| Characteristics | |
| Spectral type | F0V[1] + G1V |
| U−B color index | 0.07 / 0.13 |
| B−V color index | 0.31 / 0.59 |
| R−I color index | 0.15 / |
| 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) |
| Details | |
| Mu Boötis A | |
| Mass | 1.7[1] M☉ |
| Radius | 1.9[1] R☉ |
| Luminosity | 8[1] L☉ |
| Surface gravity (log g) | 4.14[1] cgs |
| Temperature | 7,190 ± 140[1] K |
| Orbit | |
| Companion | CCDM 15245+3722 C |
| Period (P) | 260.1 yr |
| Semi-major 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 | |
| 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.[2]
The primary component, μ¹ Boötis, is a yellow-white F-type subgiant with an apparent magnitude of +4.31.
Position
Illustration of 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日
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 |
External links
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