21589+3456
- Unique Name: 21589+3456POP 91AB
- RA: 21 58 55.79
- Dec: +34 52 57.6
- Discoverer: POP
- Discoverer Number: 91
- Components: AB
- First year: 1973
- Last year: 1986
- Observations: 2
- First position angle: 300
- Last position angle: 297
- First separation: 2.1
- Last separation: 2.6
- Mag first component: 10.8
- Mag second component: 14.6
- Spectral type:
- Primary proper motion RA: -1
- Primary proper motion DEC: -1
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung:
- Notes: