21210+0217
- Unique Name: 21210+0217HEI 408AC
- RA: 21 20 57.65
- Dec: +02 17 26.7
- Discoverer: HEI
- Discoverer Number: 408
- Components: AC
- First year: 1909
- Last year: 2000
- Observations: 7
- First position angle: 276
- Last position angle: 273
- First separation: 54.3
- Last separation: 56.0
- Mag first component: 10.96
- Mag second component: 11.7
- Spectral type:
- Primary proper motion RA: -8
- Primary proper motion DEC: -2
- Secondary proper motion RA: -4
- Secondary proper motion DEC: -17
- Durchmusterung:
- Notes: N
