21138+3500
- Unique Name: 21138+3500J 3128AC
- RA: 21 13 46.12
- Dec: +34 57 57.1
- Discoverer: J
- Discoverer Number: 3128
- Components: AC
- First year: 1941
- Last year: 2011
- Observations: 6
- First position angle: 93
- Last position angle: 93
- First separation: 14.6
- Last separation: 15.3
- Mag first component: 10.0
- Mag second component: 12.5
- Spectral type:
- Primary proper motion RA: -19
- Primary proper motion DEC: -15
- Secondary proper motion RA: -6
- Secondary proper motion DEC: -5
- Durchmusterung:
- Notes:
