21520+5401
- Unique Name: 21520+5401BU 1507
- RA: 21 51 58.01
- Dec: +54 00 54.7
- Discoverer: BU
- Discoverer Number: 1507
- Components:
- First year: 1899
- Last year: 2003
- Observations: 6
- First position angle: 68
- Last position angle: 67
- First separation: 16.0
- Last separation: 17.2
- Mag first component: 9.61
- Mag second component: 12.4
- Spectral type: K0
- Primary proper motion RA: 1
- Primary proper motion DEC: 1
- Secondary proper motion RA: 11
- Secondary proper motion DEC: 8
- Durchmusterung: +53 2723
- Notes:
