21042-5520
- Unique Name: 21042-5520RST5552AB
- RA: 21 04 13.40
- Dec: -55 19 58.8
- Discoverer: RST
- Discoverer Number: 5552
- Components: AB
- First year: 1949
- Last year: 2008
- Observations: 5
- First position angle: 329
- Last position angle: 319
- First separation: 0.2
- Last separation: 0.8
- Mag first component: 9.8
- Mag second component: 9.73
- Spectral type: G5III
- Primary proper motion RA: 107
- Primary proper motion DEC: -111
- Secondary proper motion RA: 107
- Secondary proper motion DEC: -111
- Durchmusterung: -55 9506
- Notes: