21521+0739
- Unique Name: 21521+0739OSO 158AC
- RA: 21 52 08.91
- Dec: +07 38 40.1
- Discoverer: OSO
- Discoverer Number: 158
- Components: AC
- First year: 1994
- Last year: 2013
- Observations: 4
- First position angle: 41
- Last position angle: 34
- First separation: 16.6
- Last separation: 13.4
- Mag first component: 10.84
- Mag second component: 17.4
- Spectral type: G5
- Primary proper motion RA: 196
- Primary proper motion DEC: 42
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung:
- Notes: N
