21424+1750
- Unique Name: 21424+1750BU 691AC
- RA: 21 42 25.22
- Dec: +17 50 09.5
- Discoverer: BU
- Discoverer Number: 691
- Components: AC
- First year: 1900
- Last year: 2001
- Observations: 5
- First position angle: 251
- Last position angle: 249
- First separation: 87.5
- Last separation: 84.5
- Mag first component: 8.9
- Mag second component: 12.53
- Spectral type: K0
- Primary proper motion RA: -21
- Primary proper motion DEC: -5
- Secondary proper motion RA: 0
- Secondary proper motion DEC: -3
- Durchmusterung:
- Notes: N
