21102+3151
- Unique Name: 21102+3151SEI1423
- RA: 21 10 13.38
- Dec: +31 50 38.6
- Discoverer: SEI
- Discoverer Number: 1423
- Components:
- First year: 1894
- Last year: 2004
- Observations: 7
- First position angle: 225
- Last position angle: 226
- First separation: 14.2
- Last separation: 13.6
- Mag first component: 10.22
- Mag second component: 12.18
- Spectral type: K2
- Primary proper motion RA: 2
- Primary proper motion DEC: -3
- Secondary proper motion RA: 0
- Secondary proper motion DEC: 7
- Durchmusterung: +31 4363
- Notes: