21171+3546
- Unique Name: 21171+3546BU 162AB
- RA: 21 17 06.82
- Dec: +35 46 10.3
- Discoverer: BU
- Discoverer Number: 162
- Components: AB
- First year: 1873
- Last year: 2011
- Observations: 66
- First position angle: 240
- Last position angle: 254
- First separation: 1.5
- Last separation: 1.2
- Mag first component: 8.6
- Mag second component: 8.84
- Spectral type: A7IV
- Primary proper motion RA: 2
- Primary proper motion DEC: -22
- Secondary proper motion RA: 2
- Secondary proper motion DEC: -22
- Durchmusterung: +35 4461
- Notes: