21402+4316
- Unique Name: 21402+4316AC 20AB
- RA: 21 40 11.06
- Dec: +43 16 25.7
- Discoverer: AC
- Discoverer Number: 20
- Components: AB
- First year: 1860
- Last year: 2008
- Observations: 16
- First position angle: 323
- Last position angle: 327
- First separation: 2.9
- Last separation: 2.7
- Mag first component: 5.28
- Mag second component: 10.1
- Spectral type: M2III
- Primary proper motion RA: 63
- Primary proper motion DEC: 16
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +42 4177
- Notes: N
