Rasalgethi

Rasalgethi

(ras-al-jee -th'ee) (α Her) A visual binary in the constellation Hercules. The primary (A) is a red supergiant that varies irregularly in magnitude from 2.7 to 4.0, the 5th-magnitude yellow giant companion (B) appearing green by contrast. B is a spectroscopic binary, period 51.6 days. Spectral type: M5 I (A), G5 III + F2 (B); distance: 193 pc.
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Now we'll head over to Hercules where we'll meet the spectacular double Alpha ([alpha]) Herculis, Rasalgethi (rahsuhl-JAY-the).
These 'classical doubles', as I would describe them, often consist of reddish primaries accompanied by bluish-green companions, of which Albireo (Beta Cygni), Almaach (Gamma Andromedae), Rasalgethi (Alpha Herculis) and 95 Herculis are prominent examples.
It contains a red giant variable star named Rasalgethi which varies in brightness but also has a blue companion so is a double star as well.
Rasalgethi, Hercules' brightest star, lies quite close to Rasalhague.
The proper name for Alpha Herculis is Rasalgethi, which as a child learning the stars I pronounced rass-AL-guh-thi.
Alpha ([alpha]) Herculis, also called Rasalgethi, is a much easier supergiant double to split.
You could begin with Albireo (Beta Cygni) and Rasalgethi (Alpha Herculis), two of the color-contrast pairs that are very high in this sky.
It must compete with the intensely hued showpiece double Rasalgethi (Alpha Herculis) and the magnificent Hercules Cluster (Messier 13).
Non-zodiacal Hercules is dim but named for the most famous hero in Greek mythology, so it has at least five named stars: Rasalgethi, Kornephoros or Rutilicus, Marsic, Maasym, and Cujam (respectively Alpha, Beta, Kappa, Lambda, and Omega Herculis).
The other corners are two stars in Ophiuchus (Beta and Kappa) and Rasalgethi, the Alpha star (though not the brightest) of the constellation Hercules.
His starry head, Rasalgethi, is near the head of Ophiuchus, Rasalhague, as though our hero is offering help with the monstrous serpent that Ophiuchus is wrestling.
The last, Rasalgethi, is not only double but variable.