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ρ Boötis
File:Rho Bootes.jpg
ρ Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 31m 49.7899s
Declination +30° 22′ 17.174″
Apparent magnitude (V) 3.583
Characteristics
Spectral type K3III
U-B color index 1.44
B-V color index 1.3
R-I color index 0.65
Variable type Variable star
Astrometry
Radial velocity (Rv) -13.7 km/s
Proper motion (μ) RA: -100.44 mas/yr
Dec.: 120.22 mas/yr
Parallax (π) 21.92 ± 0.81 mas
Distance 149 ± 5 ly
(46 ± 2 pc)
Absolute magnitude (MV) 4.899
Details
Mass 0,8 M
Radius 0,9 R
Luminosity 0,4 L
Temperature 3,500–5,000 K
Rotation < 17 Km/s
0,007348 Year
Orbit
Companion CCDM 14318+3022 B
Semimajor axis (a) 42.2"
Inclination (i) 339°
Other designations
25 Boötis, HR 5429, HD 127665, BD+31°2628, FK5 534, HIP 71053, SAO 64202, GC 19597, ADS 9296, CCDM 14318+3022.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)
Database references
SIMBAD data

Rho Boötis (ρ Boo / ρ Boötis) is a binary star in the constellation Boötes. It is approximately 149 light years from Earth.

The primary component, ρ Boötis A, is an orange K-type giant with an apparent magnitude of +3.57. Its companion, ρ Boötis B, is an eleventh magnitude star located 42 arcseconds away.

Along with Sigma Bootis, it shares the traditional name Al Hamalain, from the Arabic الحملين al-ħamalayn "the two sheep (rams). Specifically, it is Hemelein Prima to Sigma's Hemelain Secunda, from Latin prīma "first".

Components

NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
ADS 9296 B (BD+31 2628B) 14h 31m 48.8s +30° 22' 49 11.5 Simbad

References

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