34 Boötis

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34 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 43m 25.3632s
Declination +26° 31′ 40.261″
Apparent magnitude (V) 4.827
Spectral type M3III
U−B color index 1.94
B−V color index 1.66
R−I color index 1.22
Variable type Semi-regular
Radial velocity (Rv) 5.6 km/s
Proper motion (μ) RA: -13.29 mas/yr
Dec.: -16.68 mas/yr
Parallax (π) 3.67 ± 0.94 mas
Distance approx. 900 ly
(approx. 270 pc)
Absolute magnitude (MV) -2.5
Mass 4.4 M
Radius 110 R
Luminosity 830 L
Temperature 3300 K
Other designations
W Boötis, HR 5490, HD 129712, FK5 1383, HIP 71995, SAO 83488, BD+27° 2413, GC 19831.
Database references

34 Boötis or W Boötis is a star in the constellation Boötes.

34 Boötis is a M-type red giant with a mean apparent magnitude of +4.80. It is approximately 890 light years from Earth. It is classified as a semiregular variable star and its brightness varies from magnitude +4.73 to +5.4 with a period of 450 days.


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