21559+1536
- Unique Name: 21559+1536BU 1508AC
- RA: 21 55 53.52
- Dec: +15 36 17.6
- Discoverer: BU
- Discoverer Number: 1508
- Components: AC
- First year: 1903
- Last year: 2001
- Observations: 4
- First position angle: 299
- Last position angle: 306
- First separation: 21.9
- Last separation: 42.4
- Mag first component: 10.07
- Mag second component: 14.76
- Spectral type: G5
- Primary proper motion RA: 140
- Primary proper motion DEC: -129
- Secondary proper motion RA: 3
- Secondary proper motion DEC: 5
- Durchmusterung:
- Notes: