21028+4551

  • Unique Name: 21028+4551BU 1138AB
  • RA: 21 02 48.62
  • Dec: +45 50 56.0
  • Discoverer: BU
  • Discoverer Number: 1138
  • Components: AB
  • First year: 1888
  • Last year: 2006
  • Observations: 57
  • First position angle: 186
  • Last position angle: 172
  • First separation: 0.3
  • Last separation: 0.1
  • Mag first component: 7.1
  • Mag second component: 7.3
  • Spectral type: B3Vn
  • Primary proper motion RA: 9
  • Primary proper motion DEC: 4
  • Secondary proper motion RA:
  • Secondary proper motion DEC:
  • Durchmusterung: +45 3374
  • Notes: NO
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