21509-4052
- Unique Name: 21509-4052CRU 2AB
- RA: 21 50 56.33
- Dec: -40 51 57.1
- Discoverer: CRU
- Discoverer Number: 2
- Components: AB
- First year: 1879
- Last year: 1999
- Observations: 9
- First position angle: 307
- Last position angle: 307
- First separation: 22.5
- Last separation: 23.1
- Mag first component: 9.9
- Mag second component: 11.44
- Spectral type: G3V
- Primary proper motion RA: -101
- Primary proper motion DEC: -54
- Secondary proper motion RA: -103
- Secondary proper motion DEC: -55
- Durchmusterung: -4114659
- Notes: N
