12123+5429
- Unique Name: 12123+5429VYS 5
- RA: 12 12 20.86
- Dec: +54 29 08.7
- Discoverer: VYS
- Discoverer Number: 5
- Components:
- First year: 1955
- Last year: 2012
- Observations: 19
- First position angle: 10
- Last position angle: 12
- First separation: 14.3
- Last separation: 14.8
- Mag first component: 9.91
- Mag second component: 13.53
- Spectral type: M0V+M3V
- Primary proper motion RA: 233
- Primary proper motion DEC: 91
- Secondary proper motion RA: 182
- Secondary proper motion DEC: 37
- Durchmusterung: +55 1519
- Notes: NV
