21089+4815
- Unique Name: 21089+4815ARG 42AB
- RA: 21 08 52.58
- Dec: +48 14 48.4
- Discoverer: ARG
- Discoverer Number: 42
- Components: AB
- First year: 1899
- Last year: 2010
- Observations: 24
- First position angle: 58
- Last position angle: 60
- First separation: 24.1
- Last separation: 21.2
- Mag first component: 8.81
- Mag second component: 9.67
- Spectral type: K5
- Primary proper motion RA: 11
- Primary proper motion DEC: 3
- Secondary proper motion RA: -5
- Secondary proper motion DEC: -21
- Durchmusterung: +47 3306
- Notes: L
