21410+3504
- Unique Name: 21410+3504HO 164AB
- RA: 21 41 01.95
- Dec: +35 04 44.7
- Discoverer: HO
- Discoverer Number: 164
- Components: AB
- First year: 1882
- Last year: 2008
- Observations: 48
- First position angle: 62
- Last position angle: 70
- First separation: 3.0
- Last separation: 4.4
- Mag first component: 9.51
- Mag second component: 9.8
- Spectral type: K0
- Primary proper motion RA: -30
- Primary proper motion DEC: -21
- Secondary proper motion RA: 0
- Secondary proper motion DEC: 0
- Durchmusterung: +34 4492
- Notes: D
