21105+3851
- Unique Name: 21105+3851SEI1429
- RA: 21 10 27.38
- Dec: +38 51 11.7
- Discoverer: SEI
- Discoverer Number: 1429
- Components:
- First year: 1895
- Last year: 2002
- Observations: 6
- First position angle: 351
- Last position angle: 351
- First separation: 24.8
- Last separation: 25.1
- Mag first component: 9.86
- Mag second component: 11.01
- Spectral type: A2
- Primary proper motion RA: -1
- Primary proper motion DEC: -5
- Secondary proper motion RA: -2
- Secondary proper motion DEC: -4
- Durchmusterung: +38 4369
- Notes: