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Kappa Boötis (κ Boo / κ Boötis) is a star system in the constellation Boötes. It has the traditional name Asellus Tertius (Latin for "third donkey colt") and the Flamsteed designation 17 Boötis. Kappa Boötis is approximately 155 light years from Earth.

Boötes Constellation

κ1 Boötis

κ1 Boötis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Boötes
Right ascension 14h 13m 27.7s
Declination +51° 47' 16"
Apparent magnitude (V) +4.53, +6.62
Distance 155 ± 6 ly
(48 ± 2 pc)
Spectral type F1V
Database references

Kappa Boötis is a double star viewable in small telescope, with components separated by an angular distance of 13.4 arcseconds. The primary star, κ² Boötis, has apparent magnitude +4.54 and spectral class A8IV.

κ2 Boötis

κ2 Boötis

Kappa Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 13m 29.0078s
Declination +51° 47′ 23.874″
Spectral type A8IV
U-B color index 0.14
B-V color index 0.2
R-I color index 0.12
Variable type Delta Scuti variable
Radial velocity (Rv) -17.4 km/s
Proper motion (μ) RA: 61.39 mas/yr
Dec.: -10.57 mas/yr
Parallax (π) 21.03 ± 0.83 mas
Distance 155 ± 6 ly
(48 ± 2 pc)
Absolute magnitude (MV) 4.74
Mass 3,1 M
Radius 2,1 R
Luminosity 40 L
Temperature 7,500–10,000 K
Rotation 127 Km/s
0,002295 Year
Other designations
Asellus Tertius, 17 Boötis, HR 5329+HR 5328, HD 124675+HD 124674, BD+52°1782, HIP 69483+HIP 69481, SAO 29046+SAO 29045, GC 19207+GC 19204, ADS 9173, CCDM 14135+5147.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

κ2 Boötis is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.50 to +4.58 with a period of 1.83 hours. The companion star, κ¹ Boötis, has magnitude +6.58 and spectral class F1V.




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