21129+4033
- Unique Name: 21129+4033ES 256
- RA: 21 12 51.05
- Dec: +40 33 32.4
- Discoverer: ES
- Discoverer Number: 256
- Components:
- First year: 1895
- Last year: 2003
- Observations: 6
- First position angle: 280
- Last position angle: 281
- First separation: 4.3
- Last separation: 4.5
- Mag first component: 11.3
- Mag second component: 11.5
- Spectral type:
- Primary proper motion RA: 24
- Primary proper motion DEC: -8
- Secondary proper motion RA: -38
- Secondary proper motion DEC: 14
- Durchmusterung: +39 4481
- Notes: