21508+6400
- Unique Name: 21508+6400MRI 57AC
- RA: 21 50 47.34
- Dec: +64 00 30.3
- Discoverer: MRI
- Discoverer Number: 57
- Components: AC
- First year: 1999
- Last year: 2012
- Observations: 3
- First position angle: 292
- Last position angle: 292
- First separation: 15.9
- Last separation: 15.9
- Mag first component: 12.1
- Mag second component: 12.8
- Spectral type:
- Primary proper motion RA: -1
- Primary proper motion DEC: -6
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung:
- Notes: