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, Qī Gōng liù (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 2 3 4 5 6 7 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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