21019+2340
- Unique Name: 21019+2340COU 128
- RA: 21 01 54.85
- Dec: +23 39 57.2
- Discoverer: COU
- Discoverer Number: 128
- Components:
- First year: 1966
- Last year: 2007
- Observations: 28
- First position angle: 129
- Last position angle: 149
- First separation: 0.2
- Last separation: 0.1
- Mag first component: 8.57
- Mag second component: 8.85
- Spectral type: F8
- Primary proper motion RA: 0
- Primary proper motion DEC: -9
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +23 4216
- Notes: N
