21353+5210
- Unique Name: 21353+5210HU 594AB
- RA: 21 35 20.07
- Dec: +52 10 10.5
- Discoverer: HU
- Discoverer Number: 594
- Components: AB
- First year: 1902
- Last year: 2013
- Observations: 7
- First position angle: 265
- Last position angle: 265
- First separation: 3.7
- Last separation: 3.6
- Mag first component: 9.27
- Mag second component: 11.77
- Spectral type: B5
- Primary proper motion RA: 4
- Primary proper motion DEC: -4
- Secondary proper motion RA: -4
- Secondary proper motion DEC: -3
- Durchmusterung: +51 3099
- Notes: