21400+5133
- Unique Name: 21400+5133BU 372
- RA: 21 40 00.58
- Dec: +51 33 21.5
- Discoverer: BU
- Discoverer Number: 372
- Components:
- First year: 1875
- Last year: 2008
- Observations: 9
- First position angle: 0
- Last position angle: 351
- First separation: 1.4
- Last separation: 1.7
- Mag first component: 8.48
- Mag second component: 10.8
- Spectral type: A2
- Primary proper motion RA: 0
- Primary proper motion DEC: 29
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +50 3403
- Notes: