Alphard (Alpha Hydrae)
Hydra and environs. Map © 2003 Torsten Bronge.
Alphard (Alpha Hydrae) is the brightest star in the constellation Hydra, made more noticeable by being in a fairly barren region of sky to the southwest of Regulus. Its Arabic name means "the solitary one."
Alphard is an orange giant and mild barium star with a companion that, before it became a white dwarf, contaminated its partner with the byproducts of nuclear fusion that had been dredged to its surface.
|surface temperature||4,000 K|
|distance||177 light-years (54 pc)|
|position||R.A. 09h 27m 35.2s,
Dec. -08° 39' 31"
|other designations||Alfard, Alphart, Kalbelaphard,
Cor Hydrae, 30 Hydrae,
HR 3748, BD -08°2680, HD 81797,
SAO 136871, FK5 354, HIP 46390