44 Boötis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 03m 47.29565s[1] |
| Declination | +47° 39′ 14.6228″[1] |
| Apparent magnitude (V) | 4.75[2] |
| Characteristics | |
| Spectral type | G0Vnv[3] + F |
| U−B color index | 0.09[2] |
| B−V color index | 0.65[2] |
| Variable type | W UMa variable |
| Astrometry | |
| Radial velocity (Rv) | -17.89[4] km/s |
| Proper motion (μ) | RA: -445.84[1] mas/yr Dec.: 19.86[1] mas/yr |
| Parallax (π) | 78.39 ± 1.03[5] mas |
| Distance | 41.6 ± 0.5 ly (12.8 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.211[5] |
| Details | |
| 44 Boo A | |
| Surface gravity (log g) | 4.33[6] cgs |
| Temperature | 5,877[6] K |
| Metallicity [Fe/H] | -0.24[6] dex |
| Age | 1.4–1.5[7] Gyr |
| Orbit[8] | |
| Primary | 44 Boo A |
| Period (P) | 209.8 yr |
| Semi-major axis (a) | 3.666" |
| Inclination (i) | 83.6° |
| Longitude of the node (Ω) | 57.1° |
| Argument of periastron (ω) (secondary) |
39.9° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
44 Boötis or i Boötis is a triple star system in the constellation Boötes. It is approximately 41.6 light years from Earth.
The primary component, 44 Boötis A, is a yellow-white G-type main sequence dwarf with a mean apparent magnitude of +4.83. The companion component, 44 Boötis B, is a W Ursae Majoris variable spectroscopic binary. The variability of this star system was discovered by English astronomer William Herschel.[10] The brightness of the binary varies from magnitude +5.8 to +6.40 with a period of 6.43 hours. The components of the eclipsing binary are separated by 0.008 Astronomical Units, roughly 3 times the distance of the Moon from Earth, and close enough to allow their stellar envelopes to overlap.
The 44 Boötis system is 42 light-years (13 parsecs) from Earth.[5]
References
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