21589+3456
- Unique Name: 21589+3456POP 91AC
- RA: 21 58 55.79
- Dec: +34 52 57.6
- Discoverer: POP
- Discoverer Number: 91
- Components: AC
- First year: 1942
- Last year: 2002
- Observations: 6
- First position angle: 321
- Last position angle: 319
- First separation: 20.2
- Last separation: 19.8
- Mag first component: 10.8
- Mag second component: 11.61
- Spectral type:
- Primary proper motion RA: -1
- Primary proper motion DEC: -5
- Secondary proper motion RA: -2
- Secondary proper motion DEC: -5
- Durchmusterung:
- Notes: