21125+3720
- Unique Name: 21125+3720HJ 1623A,BC
- RA: 21 12 29.29
- Dec: +37 19 19.5
- Discoverer: HJ
- Discoverer Number: 1623
- Components: A,BC
- First year: 1828
- Last year: 2011
- Observations: 8
- First position angle: 332
- Last position angle: 152
- First separation: 10.0
- Last separation: 15.4
- Mag first component: 10.91
- Mag second component: 11.28
- Spectral type:
- Primary proper motion RA: -3
- Primary proper motion DEC: -15
- Secondary proper motion RA: -10
- Secondary proper motion DEC: -12
- Durchmusterung: +36 4461
- Notes: