21017+1851
- Unique Name: 21017+1851UC 4363
- RA: 21 01 40.03
- Dec: +18 50 56.2
- Discoverer: UC
- Discoverer Number: 4363
- Components:
- First year: 2000
- Last year: 2001
- Observations: 2
- First position angle: 217
- Last position angle: 216
- First separation: 6.6
- Last separation: 6.6
- Mag first component: 15.6
- Mag second component: 15.8
- Spectral type:
- Primary proper motion RA: 33
- Primary proper motion DEC: 43
- Secondary proper motion RA: 55
- Secondary proper motion DEC: 18
- Durchmusterung:
- Notes: V