21431+4021
- Unique Name: 21431+4021TDT3121
- RA: 21 43 04.10
- Dec: +40 20 45.3
- Discoverer: TDT
- Discoverer Number: 3121
- Components:
- First year: 1991
- Last year: 1991
- Observations: 1
- First position angle: 157
- Last position angle: 157
- First separation: 1.9
- Last separation: 1.9
- Mag first component: 11.85
- Mag second component: 12.36
- Spectral type:
- Primary proper motion RA: -14
- Primary proper motion DEC: 3
- Secondary proper motion RA: -14
- Secondary proper motion DEC: 3
- Durchmusterung:
- Notes: