21004+3411
- Unique Name: 21004+3411BU 1329AB
- RA: 21 00 26.00
- Dec: +34 10 42.4
- Discoverer: BU
- Discoverer Number: 1329
- Components: AB
- First year: 1902
- Last year: 2009
- Observations: 25
- First position angle: 59
- Last position angle: 40
- First separation: 0.3
- Last separation: 0.3
- Mag first component: 8.9
- Mag second component: 9.1
- Spectral type: A2
- Primary proper motion RA: 31
- Primary proper motion DEC: -24
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +33 4116
- Notes:
