21157+6821
- Unique Name: 21157+6821BVD 135
- RA: 21 15 42.59
- Dec: +68 21 08.1
- Discoverer: BVD
- Discoverer Number: 135
- Components:
- First year: 1893
- Last year: 2009
- Observations: 15
- First position angle: 310
- Last position angle: 310
- First separation: 24.8
- Last separation: 24.9
- Mag first component: 7.92
- Mag second component: 9.29
- Spectral type: F3V F9V
- Primary proper motion RA: 11
- Primary proper motion DEC: -48
- Secondary proper motion RA: 14
- Secondary proper motion DEC: -47
- Durchmusterung: +67 1299
- Notes: V
