21543+1333
- Unique Name: 21543+1333BU 1213AB
- RA: 21 54 15.65
- Dec: +13 33 26.2
- Discoverer: BU
- Discoverer Number: 1213
- Components: AB
- First year: 1890
- Last year: 2001
- Observations: 18
- First position angle: 259
- Last position angle: 258
- First separation: 62.3
- Last separation: 64.2
- Mag first component: 8.64
- Mag second component: 11.0
- Spectral type: K5
- Primary proper motion RA: 10
- Primary proper motion DEC: -5
- Secondary proper motion RA: -5
- Secondary proper motion DEC: -8
- Durchmusterung: +12 4710
- Notes: