NOTABLE STARS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Alphekka (Alpha Coronae Borealis) Map © 2003 Torsten Bronger Also known as Gemma, the brightest star in the constellation Corona Borealis. Its Arabic name (alternatively spelled "Alphecca"), meaning "break," refers to the broken circlet of stars that makes up the Northern Crown. Alphekka is an Algol star: the bright naked-eye star has a much fainter, Sun-like (G5) companion, that produces a barely discernable eclipse of the primary every 17.4 days. Alphekka is also a part of the Ursa Major Moving Cluster. visual magnitude 2.22 absolute magnitude 0.42 spectral type A0V + G5V surface temperature 9,500 K luminosity 60 Lsun distance 75 light-years (23 pc) position R.A. 15h 34m 41.3s, Dec. +26° 42' 53" other designations Alphecca, Gnosia, Ashtaroth, 5 CrB, HR 5793, BD +27°2512, HD 139006, GCTP 3519.00, SAO 83893, FK5 578, HIP 76267 Related category    • NOTABLE STARS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP