21390+2826
- Unique Name: 21390+2826ES 520
- RA: 21 38 58.86
- Dec: +28 26 29.9
- Discoverer: ES
- Discoverer Number: 520
- Components:
- First year: 1898
- Last year: 2013
- Observations: 11
- First position angle: 42
- Last position angle: 36
- First separation: 6.8
- Last separation: 9.3
- Mag first component: 11.2
- Mag second component: 11.7
- Spectral type: G0
- Primary proper motion RA: -4
- Primary proper motion DEC: -15
- Secondary proper motion RA: 20
- Secondary proper motion DEC: 10
- Durchmusterung: +27 4125
- Notes: D
