21078+3421
- Unique Name: 21078+3421ABH 141AD
- RA: 21 07 47.29
- Dec: +34 21 24.8
- Discoverer: ABH
- Discoverer Number: 141
- Components: AD
- First year: 1893
- Last year: 2004
- Observations: 11
- First position angle: 42
- Last position angle: 43
- First separation: 83.4
- Last separation: 84.9
- Mag first component: 10.22
- Mag second component: 8.73
- Spectral type: A7III
- Primary proper motion RA: 8
- Primary proper motion DEC: -2
- Secondary proper motion RA: 14
- Secondary proper motion DEC: 1
- Durchmusterung: +33 4172
- Notes: U
