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Hamal (Alpha Arietis)
Easily the brightest star in the constellation Aries, an orange giant K star. Its Arabic name, meaning “the lamb,” stands for the whole constellation of the Ram. Hamal has the distinction of having, along with Shedar (Alpha Cassiopeiae), the most accurately-measured angular diameter – 0.00680" (the width of a cent coin seen from 60 km away). This precise measurement also enabled Hamal to become one of the few stars for which limb darkening has been detected.
| Visual magnitude | 2.01 |
| Absolute magnitude | 0.48 |
| Spectral type | K2III |
| Surface temperature | 4,590 K |
| Luminosity | 90 Lsun |
| Radius | 15 Rsun |
| Mass | 2 Msun |
| Distance | 66 light-years |
| Position | R.A. 02h 07m 10.4s, Dec. +23° 27' 45" |
Related category
• NOTABLE STARS
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