21591+5656
- Unique Name: 21591+5656ES 1801
- RA: 21 59 06.42
- Dec: +56 56 26.9
- Discoverer: ES
- Discoverer Number: 1801
- Components:
- First year: 1919
- Last year: 2008
- Observations: 4
- First position angle: 107
- Last position angle: 99
- First separation: 6.5
- Last separation: 5.8
- Mag first component: 8.84
- Mag second component: 13.8
- Spectral type: G0
- Primary proper motion RA: 4
- Primary proper motion DEC: 7
- Secondary proper motion RA: -7
- Secondary proper motion DEC: -5
- Durchmusterung: +56 2667
- Notes: