21591+6400
- Unique Name: 21591+6400HU 975AB,C
- RA: 21 59 03.72
- Dec: +63 59 55.3
- Discoverer: HU
- Discoverer Number: 975
- Components: AB,C
- First year: 1904
- Last year: 2008
- Observations: 8
- First position angle: 135
- Last position angle: 135
- First separation: 1.9
- Last separation: 1.9
- Mag first component: 8.9
- Mag second component: 11.02
- Spectral type: B8V
- Primary proper motion RA: -4
- Primary proper motion DEC: -8
- Secondary proper motion RA: -4
- Secondary proper motion DEC: -8
- Durchmusterung:
- Notes: