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 had the
distinction, at least up until a few years ago, 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.
||R.A. 02h 07m 10.4s,
Dec. +23° 27' 45"