21390+5729
- Unique Name: 21390+5729GUI 36CD
- RA: 21 38 58.88
- Dec: +57 29 14.6
- Discoverer: GUI
- Discoverer Number: 36
- Components: CD
- First year: 1783
- Last year: 2012
- Observations: 75
- First position angle: 329
- Last position angle: 324
- First separation: 28.6
- Last separation: 30.0
- Mag first component: 7.48
- Mag second component: 7.53
- Spectral type:
- Primary proper motion RA: -6
- Primary proper motion DEC: 4
- Secondary proper motion RA: -1
- Secondary proper motion DEC: -2
- Durchmusterung:
- Notes: N
