21520+6258
- Unique Name: 21520+6258MLB 178
- RA: 21 52 00.79
- Dec: +62 57 50.6
- Discoverer: MLB
- Discoverer Number: 178
- Components:
- First year: 1898
- Last year: 2003
- Observations: 8
- First position angle: 323
- Last position angle: 325
- First separation: 4.1
- Last separation: 4.5
- Mag first component: 10.35
- Mag second component: 11.4
- Spectral type: A0
- Primary proper motion RA: 13
- Primary proper motion DEC: -28
- Secondary proper motion RA: -36
- Secondary proper motion DEC: 40
- Durchmusterung: +62 1988
- Notes: