21210+0217
- Unique Name: 21210+0217HEI 408DE
- RA: 21 21 03.52
- Dec: +02 16 51.7
- Discoverer: HEI
- Discoverer Number: 408
- Components: DE
- First year: 1909
- Last year: 2000
- Observations: 7
- First position angle: 105
- Last position angle: 106
- First separation: 52.5
- Last separation: 54.4
- Mag first component: 11.8
- Mag second component: 11.0
- Spectral type:
- Primary proper motion RA: 4
- Primary proper motion DEC: 4
- Secondary proper motion RA: 16
- Secondary proper motion DEC: -14
- Durchmusterung:
- Notes: N
