21520+5548
- Unique Name: 21520+5548STF2840AC
- RA: 21 52 01.02
- Dec: +55 47 48.3
- Discoverer: STF
- Discoverer Number: 2840
- Components: AC
- First year: 1912
- Last year: 2003
- Observations: 3
- First position angle: 348
- Last position angle: 346
- First separation: 55.2
- Last separation: 55.3
- Mag first component: 5.64
- Mag second component: 13.1
- Spectral type: B6IV-V
- Primary proper motion RA: 19
- Primary proper motion DEC: -1
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung:
- Notes: N
