21566+3421
- Unique Name: 21566+3421BU 1214CD
- RA: 21 56 38.22
- Dec: +34 22 37.4
- Discoverer: BU
- Discoverer Number: 1214
- Components: CD
- First year: 1890
- Last year: 2002
- Observations: 10
- First position angle: 246
- Last position angle: 244
- First separation: 5.1
- Last separation: 5.1
- Mag first component: 9.99
- Mag second component: 11.0
- Spectral type:
- Primary proper motion RA: -52
- Primary proper motion DEC: -26
- Secondary proper motion RA: -60
- Secondary proper motion DEC: -29
- Durchmusterung:
- Notes: