21509+3918
- Unique Name: 21509+3918MLB 788
- RA: 21 50 55.55
- Dec: +39 18 20.4
- Discoverer: MLB
- Discoverer Number: 788
- Components:
- First year: 1932
- Last year: 2007
- Observations: 4
- First position angle: 54
- Last position angle: 52
- First separation: 4.2
- Last separation: 4.9
- Mag first component: 10.0
- Mag second component: 10.1
- Spectral type:
- Primary proper motion RA: -20
- Primary proper motion DEC: -25
- Secondary proper motion RA: 24
- Secondary proper motion DEC: -8
- Durchmusterung:
- Notes:
