21566+3421
- Unique Name: 21566+3421BU 1214AB
- RA: 21 56 36.00
- Dec: +34 20 53.3
- Discoverer: BU
- Discoverer Number: 1214
- Components: AB
- First year: 1890
- Last year: 2009
- Observations: 11
- First position angle: 205
- Last position angle: 207
- First separation: 1.4
- Last separation: 1.5
- Mag first component: 9.59
- Mag second component: 10.99
- Spectral type: A0
- Primary proper motion RA: 10
- Primary proper motion DEC: 0
- Secondary proper motion RA: 10
- Secondary proper motion DEC: 0
- Durchmusterung: +33 4387
- Notes: