46 Boötis

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Template:Short description Template:About-distinguish

46 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.67[2]
Characteristics
Spectral type K2 III[3]
U−B Template:Engvar +1.24[4]
B−V Template:Engvar Template:Val[2]
Astrometry
Radial velocity (Rv)Template:Val[2] km/s
Proper motion (μ) RA: +4.454[1] mas/yr
Dec.: −15.185[1] mas/yr
Parallax (π)6.8288±0.0883 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.31[2]
Orbit[5]
Period (P)Template:Val
Semi-major axis (a)Template:Val[6]
Eccentricity (e)Template:Val
Inclination (i)62[6]°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val[5]°
Semi-amplitude (K1)
(primary)		Template:Val[5] km/s
Details
46 Boo A
RadiusTemplate:Val[1] Template:Solar radius
LuminosityTemplate:Val[1] Template:Solar luminosity
TemperatureTemplate:Val[1] K
Metallicity [Fe/H]Template:Val[7] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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46 Boötis is a binary star system in the northern constellation of Boötes, located mid-way between α Coronae Borealis and ε Boötis.[5] It has the Bayer designation b Boötis; 46 Boötis is the Flamsteed designation.[8] The system lies 478 light-years away from the Sun based on parallax,[1] and is visible to the naked eye as a faint, orange-hued star with a combined apparent visual magnitude of 5.67.[2] It is moving away from the Earth with a heliocentric radial velocity of +19 km/s.[2] The light from this system displays an unusually high level of polarization due to interstellar dust.[5]

This is a single-lined spectroscopic binary with an orbital period of Template:Convert and a large eccentricity of 0.83.[5] The primary member, designated component A, is an aging giant star with a stellar classification of K2 III.[3] As a consequence of exhausting the hydrogen at its core, it has expanded to 23[1] times the Sun's radius. It is radiating 176[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of Template:Val.[1] The companion star, component B, is most likely a lower main-sequence star with 0.6–0.8 times the Sun's mass.[6]

References

Template:Reflist

External links

Template:Stars of Boötes

  1. ↑ a b c d e f g h i j k l Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR2
  2. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Sato1990
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named UBV
  5. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Griffin1999
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Jancart2005
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Taylor1991
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
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