21519+4221
- Unique Name: 21519+4221HO 172AC
- RA: 21 51 52.93
- Dec: +42 20 38.0
- Discoverer: HO
- Discoverer Number: 172
- Components: AC
- First year: 1895
- Last year: 2013
- Observations: 7
- First position angle: 52
- Last position angle: 40
- First separation: 51.7
- Last separation: 89.7
- Mag first component: 7.93
- Mag second component: 13.31
- Spectral type: G5
- Primary proper motion RA: -175
- Primary proper motion DEC: -306
- Secondary proper motion RA: 2
- Secondary proper motion DEC: -3
- Durchmusterung:
- Notes: N
