21190+3945
- Unique Name: 21190+3945STT 434AB
- RA: 21 19 00.03
- Dec: +39 44 57.6
- Discoverer: STT
- Discoverer Number: 434
- Components: AB
- First year: 1828
- Last year: 2006
- Observations: 35
- First position angle: 114
- Last position angle: 122
- First separation: 26.5
- Last separation: 23.9
- Mag first component: 6.67
- Mag second component: 9.93
- Spectral type: B9V
- Primary proper motion RA: 15
- Primary proper motion DEC: 8
- Secondary proper motion RA: 17
- Secondary proper motion DEC: 8
- Durchmusterung: +39 4519
- Notes: N D
