20210+3919
- Unique Name: 20210+3919SEI1097AB
- RA: 20 21 02.17
- Dec: +39 17 33.7
- Discoverer: SEI
- Discoverer Number: 1097
- Components: AB
- First year: 1892
- Last year: 2008
- Observations: 10
- First position angle: 51
- Last position angle: 46
- First separation: 23.3
- Last separation: 27.2
- Mag first component: 11.2
- Mag second component: 12.19
- Spectral type:
- Primary proper motion RA: -4
- Primary proper motion DEC: -22
- Secondary proper motion RA: 4
- Secondary proper motion DEC: 13
- Durchmusterung:
- Notes: L
