Iota bootis

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Double star
Iota Bootis
Iota Bootis is the left of the two stars at the arrowhead.
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Bear keeper
Right ascension 14 h 16 m 9.93 s
declination + 51 ° 22 ′ 2 ″
Apparent brightness 4.75 likes
Typing
B − V color index +0.20 
U − B color index +0.06 
R − I index +0.09 
Spectral class A9 V
Astrometry
Radial velocity (−18.4 ± 2.7) km / s
parallax (34.40 ± 0.19)  mas
distance (94.8 ± 0.5)  ly
(29.1 ± 0.2)  pc  
Visual absolute brightness M vis +2.4 mag
Proper movement 
Rec. Share: (−149.39 ± 0.19)  mas / a
Dec. portion: (+88.72 ± 0.17)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name ι Bootis
Flamsteed name 21 bootis
Bonn survey BD + 52 ° 1784
Bright Star Catalog HR 5350 [1]
Henry Draper Catalog HD 125161 [2]
Hipparcos catalog HIP 69713 [3]
SAO catalog SAO 29071 [4]
Tycho catalog TYC 3478-1333-1 [5]
annotation
  1. ↑ estimated from apparent brightness and distance

ι Bootis (Iota Bootis, pronunciation: Bo-otes , short ι Boo , historical proper name Asellus Secundus , Latin second donkey ) is a star in the Bear Guardian constellation , about 95  light years away .

ι Bootis is a wide double star (angular distance 38.6 ") that can be separated in binoculars. The main star has an apparent magnitude of 4.75 mag and belongs to the spectral class A9 V, the companion has a magnitude of 8.27 likes and belongs to the spectral class A2.

ι Bootis is located - with the close neighboring stars θ and κ Bootis ( Asellus Primus and Asellus Tertius ) on the northern edge of the constellation, close to the drawbar of the Big Dipper .

See also: Asellus Borealis and Asellus Australis (constellation Cancer)

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)