21217+7902
- Unique Name: 21217+7902UC 4456
- RA: 21 21 41.93
- Dec: +79 01 30.1
- Discoverer: UC
- Discoverer Number: 4456
- Components:
- First year: 1999
- Last year: 2003
- Observations: 2
- First position angle: 353
- Last position angle: 353
- First separation: 30.3
- Last separation: 30.2
- Mag first component: 14.0
- Mag second component: 16.0
- Spectral type:
- Primary proper motion RA: 40
- Primary proper motion DEC: 51
- Secondary proper motion RA: 41
- Secondary proper motion DEC: 58
- Durchmusterung:
- Notes: V