21490+4323
- Unique Name: 21490+4323PKO 16
- RA: 21 48 54.90
- Dec: +43 22 35.1
- Discoverer: PKO
- Discoverer Number: 16
- Components:
- First year: 1971
- Last year: 2010
- Observations: 5
- First position angle: 95
- Last position angle: 95
- First separation: 5.9
- Last separation: 6.0
- Mag first component: 10.5
- Mag second component: 11.2
- Spectral type:
- Primary proper motion RA: -1
- Primary proper motion DEC: -4
- Secondary proper motion RA: 16
- Secondary proper motion DEC: 3
- Durchmusterung:
- Notes: