|
gptkbp:instanceOf
|
gptkb:star
binary star system
|
|
gptkbp:age
|
~400 million years
|
|
gptkbp:angularSeparation
|
2.8 arcseconds
|
|
gptkbp:apparentMagnitude
|
2.37
|
|
gptkbp:BayerDesignation
|
ε Boötis
|
|
gptkbp:bestViewedIn
|
gptkb:spring
|
|
gptkbp:catalogueNumber
|
gptkb:HD_133208
gptkb:HIP_73555
gptkb:HR_5506
|
|
gptkbp:color
|
primary: orange
secondary: blue-white
|
|
gptkbp:component
|
Epsilon Boötis A
Epsilon Boötis B
|
|
gptkbp:constellation
|
gptkb:Boötes
|
|
gptkbp:declination
|
+27° 04′ 27″
|
|
gptkbp:discoveredBy
|
gptkb:William_Herschel
|
|
gptkbp:discoveredIn
|
1777
|
|
gptkbp:distanceFromEarth
|
203 light years
|
|
gptkbp:FlamsteedDesignation
|
gptkb:Izar
|
|
gptkbp:hasCompanion
|
yes
|
|
gptkbp:hemisphere
|
northern
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Epsilon Boötis
|
|
gptkbp:IAUApprovedName
|
gptkb:Izar
|
|
gptkbp:locatedIn
|
gptkb:Boötes
|
|
gptkbp:luminosity
|
primary: 501 L☉
secondary: 33 L☉
|
|
gptkbp:mass
|
primary: 3.0 M☉
secondary: 2.5 M☉
|
|
gptkbp:metallicity
|
[Fe/H] = -0.07
|
|
gptkbp:nameMeaning
|
'Veil' or 'girdle' in Arabic
|
|
gptkbp:notableFor
|
color contrast
|
|
gptkbp:observedBy
|
amateur astronomers
|
|
gptkbp:orbitType
|
990 years
|
|
gptkbp:otherName
|
gptkb:Izar
Pulcherrima
|
|
gptkbp:parallax
|
16.09 mas
|
|
gptkbp:primaryStarType
|
gptkb:giant
|
|
gptkbp:properMotionRA
|
+56.60 mas/yr
-60.73 mas/yr
|
|
gptkbp:radialVelocity
|
-19.6 km/s
|
|
gptkbp:rightAscension
|
14h 44m 59.3s
|
|
gptkbp:secondaryStarType
|
gptkb:main_sequence
|
|
gptkbp:separates
|
2.8 arcseconds
|
|
gptkbp:spectralType
|
K0II-III + A2V
|
|
gptkbp:temperature
|
primary: 4,500 K
secondary: 8,800 K
|
|
gptkbp:variableStar
|
no
|
|
gptkbp:visibleToNakedEye
|
yes
|
|
gptkbp:bfsParent
|
gptkb:Izar
|
|
gptkbp:bfsLayer
|
6
|