21505+3944
- Unique Name: 21505+3944ES 211AB
- RA: 21 50 29.10
- Dec: +39 44 27.0
- Discoverer: ES
- Discoverer Number: 211
- Components: AB
- First year: 1904
- Last year: 2003
- Observations: 7
- First position angle: 197
- Last position angle: 197
- First separation: 2.6
- Last separation: 2.5
- Mag first component: 10.88
- Mag second component: 12.21
- Spectral type:
- Primary proper motion RA: 1
- Primary proper motion DEC: 11
- Secondary proper motion RA: 3
- Secondary proper motion DEC: 9
- Durchmusterung: +39 4683
- Notes: