✧ Corona Borealis

  Corona Borealis is an asterism in Corona Borealis.

                                      ·
                                      ⠈⢧
                                       ⠈⢧
            ·                           ⠈⢧
            ⠸⡄                           ⠈⢧
             ⣇                            ⠈·
             ⢸⡀                           ⡼⠁
              ⡇                          ⡼⠁
              ⢹                         ⡼⠁
              ⠘⡆                       ⡼⠁
               ·⢤⣀                    ⡼⠁
                 ⠈⠙⠲⢤⣀           ⢀⣀⣠⠤•⠁
                     ⠈⠙·⠤⠤⠤⠤⠤·⠒⠚⠉⠉

  Type            Asterism
  Constellation   Corona Borealis
  Stars           7

  More information about Corona Borealis

  The northern crown is a neat half circle of seven stars lying between
  Bootes and Hercules, of which only Alphecca is truly bright. Medieval
  Arabic astronomers called it al-Fakka الفكة, "the broken dish", because
  the circle is open rather than closed. It also holds a star called T
  Coronae Borealis, which spends decades too faint to see and then
  suddenly flares up to naked-eye brightness for a few nights. It has done
  this roughly every eighty years, most recently in 1946, and astronomers
  have been expecting the next one for the past few years.

  Etymology
  From        Latin
  Reading     Corona Borealis
  Literally   the northern crown

  The evolution of Corona Borealis over time

  -50,000 years
  
                                                                ⢀·
                                                                ⣸
                                                               ⢀⡇
                                                               ⣸
                                                              ⢀⡇
                        ⠸·                                    ⡼
                         ⡇                                   ⢠⠇
                         ⢇                                   ⡼
                         ⢸                                  ⢠⠇
                         ⠸⡄                                 ⡜
                          ⡇                                ⢠⠃
                          ⢧                                ⠼⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠒⠒⠒⣒⡶• Alphecca
                          ·⠲⢤⣀                             · Nusakan ⣀⠤⠒⠉⠁
                              ⠉⠒⠤⢄⡀                             ⢀⡠⠔⠒⠉
                                  ⠉⠑⠢⢄⡀                     ⣀⡤⠔⠊⠁
                                      ·⢤                ⣀⠤⠖⠋⠁
                                        ⠑⢄         ⢀⣀⠤⠒⠉
                                         ⠈⠑⣄   ⢀⣠⠴⠚⠉
                                            ⠳⠔⠊⠉
                                             ·
  
  now
  
  
                                                                 ⠐·
                                                                  ⠘⣆
                                                                   ⠘⣆
                                                                    ⠘⢆
                           ⡀                                         ⠈⢆
                           ·                                          ⠈⢆
                           ⠘⡄                                           ⢣
                            ⢣                                           ⣠· Nusakan
                            ⠘⡄                                         ⡰⠃
                             ⢣                                        ⡔⠁
                             ⠈⡆                                     ⢀⡞
                              ⢱                                    ⢠⠊
                              ⠈⡆                                  ⣰⠃
                               ⢱                                 ⡰⠁
                               ⠈·⠢⢄⡀                          ⣀⣀⠜
                                   ⠈⠙⠲⢤⣀             ⢀⣀⡠⠤⠔⠒⠒⠉⠉  • Alphecca
                                        ⠉⠒⠤⡤⠤⠤⠴⠒⠒⠒⠊⠉⠉·
                                           ·
  
  
  +50,000 years
  
                                                          ·⠦⠤⢄⣀⣀
                                                                ⠉⠙⠒⠒⠤⠤⢄⣀⣀
                                                                        ⠈⠉⠉⠒⠒⠤⠤⣄
                                                                            ⢀⡰⠊· Nusakan
                    ⠠⡀                                                    ⢀⠔⠉
                     ·                                                  ⣠⠚⠁
                     ⠈⡆                                              ⢀⠴⠊
                      ⠸⡀                                           ⢠⠔⠉
                       ⢣                                         ⡠⠚⠁
                       ⠈⣆                                     ⢀⠴⠊
                        ⠘⡄                                  ⢠⠔⠉
                         ⢳                                ⡠⠚⠁
                          ⣇                            ⢀⠴⠊
                          ⠘⡄                       ⣀·⣠⠔⠁
                           ⢳                     ⣠⢞⡡⠚
                            ⢇                 ⢀⣤⢿⠽⠊
                            ⠈·⠤⣀            ⢀⢔⣵⠗⠁
                                ⠉⠓⠦⣄⡀     ⣠⢚⡱⠛
                                    ⠉⠓⠢⢄⠴⠊  • Alphecca
                                        ·

  Over 50,000 years either way the longest side of this figure changes by 28%, and the furthest
  any of its stars travels is 2.8 degrees. Nusakan and Alphecca drift the opposite way to the
  other 5, which travel together. Proper motion only: this is the shape changing, not the sky
  turning or the pole moving.

  curl 'skymap.sh/Corona%20Borealis/evolution.gif'

  where it is tonight:  skymap.sh/Corona Borealis