21187+2149
- Unique Name: 21187+2149LDS4878
- RA: 21 18 46.10
- Dec: +21 49 57.3
- Discoverer: LDS
- Discoverer Number: 4878
- Components:
- First year: 1960
- Last year: 2008
- Observations: 3
- First position angle: 10
- Last position angle: 10
- First separation: 13.0
- Last separation: 12.6
- Mag first component: 17.3
- Mag second component: 17.8
- Spectral type: M4+M4
- Primary proper motion RA: -64
- Primary proper motion DEC: 74
- Secondary proper motion RA: -70
- Secondary proper motion DEC: 78
- Durchmusterung:
- Notes: V
