page_title: Sterope (star)
hierarchical_section_title: Sterope (star)
caption_attribution_description: English: Hubble's look through the Pleiades (M45). Français&#160;: Illustration des étoiles de l'amas ouvert M45, les Pléiades, par le télescope spatial Hubble.
context_page_description: The Sterope or Asterope system is a double star in the zodiac constellation of Taurus. Its components have the Flamsteed designations 21 Tauri and 22 Tauri, and are sometimes known as Sterope I and Sterope II, respectively.
  The International Astronomical Union applies the name Asterope specifically to 21 Tauri.
  The two stars are thus
  21 Tauri
  22 Tauri
  The two stars are separated by 0.047° on the sky, which is equal to 2.82 arc-minutes and thus closer than the usual naked-eye resolution limit of 4 arc-min, giving an elongated appearance of the two together. Both are members of the Pleiades open star cluster and approximately 440 light-years from the Sun.
context_section_description: The Sterope /ˈstɛrəpiː/ or Asterope /əˈstɛrəpiː/ system is a double star in the zodiac constellation of Taurus. Its components have the Flamsteed designations 21 Tauri and 22 Tauri, and are sometimes known as Sterope I and Sterope II, respectively. 
  The International Astronomical Union applies the name Asterope specifically to 21 Tauri. 
  The two stars are thus
  21 Tauri (or Sterope I, formally Asterope)
  22 Tauri (or Sterope II)
  The two stars are separated by 0.047° on the sky, which is equal to 2.82 arc-minutes and thus closer than the usual naked-eye resolution limit of 4 arc-min, giving an elongated appearance of the two together. Both are members of the Pleiades open star cluster (M45) and approximately 440 light-years from the Sun.
caption: Position of the Asterope pair in the Pleiades
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