20400+5647
- Unique Name: 20400+5647OSW 78
- RA: 20 39 59.66
- Dec: +56 47 18.6
- Discoverer: OSW
- Discoverer Number: 78
- Components:
- First year: 1952
- Last year: 1999
- Observations: 3
- First position angle: 233
- Last position angle: 233
- First separation: 186.5
- Last separation: 186.2
- Mag first component: 16.5
- Mag second component: 16.8
- Spectral type: K5+K5
- Primary proper motion RA: 0
- Primary proper motion DEC: 1
- Secondary proper motion RA: 0
- Secondary proper motion DEC: 7
- Durchmusterung:
- Notes: V
