21578+6818
- Unique Name: 21578+6818MLB 306
- RA: 21 57 30.94
- Dec: +68 19 34.4
- Discoverer: MLB
- Discoverer Number: 306
- Components:
- First year: 1894
- Last year: 2010
- Observations: 7
- First position angle: 149
- Last position angle: 145
- First separation: 3.2
- Last separation: 3.9
- Mag first component: 11.0
- Mag second component: 11.0
- Spectral type:
- Primary proper motion RA: 20
- Primary proper motion DEC: 28
- Secondary proper motion RA: 48
- Secondary proper motion DEC: -15
- Durchmusterung:
- Notes: