21399+2005
- Unique Name: 21399+2005UC 4521
- RA: 21 39 54.59
- Dec: +20 04 45.9
- Discoverer: UC
- Discoverer Number: 4521
- Components:
- First year: 2000
- Last year: 2001
- Observations: 2
- First position angle: 35
- Last position angle: 35
- First separation: 12.4
- Last separation: 12.3
- Mag first component: 11.0
- Mag second component: 13.5
- Spectral type:
- Primary proper motion RA: 51
- Primary proper motion DEC: -11
- Secondary proper motion RA: 54
- Secondary proper motion DEC: -20
- Durchmusterung:
- Notes: V
