21091+3844
- Unique Name: 21091+3844S 779
- RA: 21 09 08.32
- Dec: +38 43 45.1
- Discoverer: S
- Discoverer Number: 779
- Components:
- First year: 1824
- Last year: 2012
- Observations: 19
- First position angle: 11
- Last position angle: 9
- First separation: 114.8
- Last separation: 110.6
- Mag first component: 7.61
- Mag second component: 9.57
- Spectral type: K2
- Primary proper motion RA: 2
- Primary proper motion DEC: -3
- Secondary proper motion RA: -15
- Secondary proper motion DEC: -21
- Durchmusterung: +38 4362
- Notes: N
