21340+5100
- Unique Name: 21340+5100COU2546
- RA: 21 34 00.90
- Dec: +51 00 10.1
- Discoverer: COU
- Discoverer Number: 2546
- Components:
- First year: 1988
- Last year: 1991
- Observations: 2
- First position angle: 171
- Last position angle: 203
- First separation: 0.9
- Last separation: 0.4
- Mag first component: 9.94
- Mag second component: 10.18
- Spectral type: K5
- Primary proper motion RA: 28
- Primary proper motion DEC: -4
- Secondary proper motion RA: 28
- Secondary proper motion DEC: -4
- Durchmusterung: +50 3364
- Notes: