21391+4421
- Unique Name: 21391+4421HJ 1673
- RA: 21 39 06.72
- Dec: +44 20 38.9
- Discoverer: HJ
- Discoverer Number: 1673
- Components:
- First year: 1828
- Last year: 2004
- Observations: 12
- First position angle: 86
- Last position angle: 81
- First separation: 3.0
- Last separation: 5.9
- Mag first component: 9.47
- Mag second component: 9.98
- Spectral type:
- Primary proper motion RA: 0
- Primary proper motion DEC: -3
- Secondary proper motion RA: 5
- Secondary proper motion DEC: -1
- Durchmusterung: +43 3995
- Notes: N
