21021+1423
- Unique Name: 21021+1423A 1687
- RA: 21 02 04.95
- Dec: +14 23 22.6
- Discoverer: A
- Discoverer Number: 1687
- Components:
- First year: 1907
- Last year: 2001
- Observations: 13
- First position angle: 182
- Last position angle: 189
- First separation: 0.6
- Last separation: 0.6
- Mag first component: 10.42
- Mag second component: 10.87
- Spectral type: K0
- Primary proper motion RA: 48
- Primary proper motion DEC: 5
- Secondary proper motion RA: 48
- Secondary proper motion DEC: 5
- Durchmusterung: +13 4599
- Notes: