21304+3504
- Unique Name: 21304+3504HLD 45
- RA: 21 30 21.53
- Dec: +35 03 40.1
- Discoverer: HLD
- Discoverer Number: 45
- Components:
- First year: 1881
- Last year: 2009
- Observations: 34
- First position angle: 198
- Last position angle: 198
- First separation: 1.3
- Last separation: 1.2
- Mag first component: 9.3
- Mag second component: 9.73
- Spectral type: A0
- Primary proper motion RA: 5
- Primary proper motion DEC: 5
- Secondary proper motion RA: 5
- Secondary proper motion DEC: 5
- Durchmusterung: +34 4437
- Notes: