21586+3900
- Unique Name: 21586+3900COU1824
- RA: 21 58 37.21
- Dec: +39 00 31.7
- Discoverer: COU
- Discoverer Number: 1824
- Components:
- First year: 1978
- Last year: 2008
- Observations: 6
- First position angle: 296
- Last position angle: 299
- First separation: 0.6
- Last separation: 0.6
- Mag first component: 10.98
- Mag second component: 11.26
- Spectral type:
- Primary proper motion RA: 4
- Primary proper motion DEC: 3
- Secondary proper motion RA: 4
- Secondary proper motion DEC: 3
- Durchmusterung: +38 4647
- Notes: