21078+3421
- Unique Name: 21078+3421ES 2313AB
- RA: 21 07 47.29
- Dec: +34 21 24.8
- Discoverer: ES
- Discoverer Number: 2313
- Components: AB
- First year: 1927
- Last year: 2012
- Observations: 5
- First position angle: 184
- Last position angle: 196
- First separation: 6.7
- Last separation: 7.3
- Mag first component: 10.22
- Mag second component: 14.4
- Spectral type: A7III
- Primary proper motion RA: 8
- Primary proper motion DEC: -2
- Secondary proper motion RA: -71
- Secondary proper motion DEC: -54
- Durchmusterung: +33 4171
- Notes: U
