![]() Historical view of the Hercules constellation showing Rasalgethi as the α star and "Head of the Kneeler" |
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Observation data Epoch J2000 Equinox J2000 |
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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
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Database references | |
SIMBAD | data |