Alpha Herculis

Historical view of the Hercules constellation showing Rasalgethi as the α star and "Head of the Kneeler"
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17
Declination +14° 23′ 25.0″
Apparent magnitude (V) 2.9137 / 5.4
Characteristics
Spectral type M5IIvar / (G5III+F2V)
U−B color index 1.01
B−V color index 1.45
Variable type Semiregular
Astrometry
Proper motion (μ) RA: -6.71 mas/yr
Parallax (π) 9.07 ± 1.32mas
Distance approx. 360 ly
(approx. 110 pc)
Absolute magnitude (MV) -2.30
Details
Mass 2.15 ± 0.22M
Radius 387R
Luminosity 8,300L
Surface gravity (log g) −0.41 ± 0.19
Temperature 2,800K
Other designations
Ras Algethi, Rasalgethi, α Her, 64 Her, HR 6406, BD +14° 3207, HD 156014J, HIP 84345, SAO 102680, CCDM J17146+1424AB, AAVSO 1710+14
Database references
SIMBAD data

Get more info about Rasalgethi in Wikipedia

This article uses material from the Wikipedia article
Rasalgethi, which is released under the Creative Commons Attribution-Share-Alike License 3.0