21045+2457
- Unique Name: 21045+2457POU5131BD
- RA: 21 04 28.62
- Dec: +24 57 36.8
- Discoverer: POU
- Discoverer Number: 5131
- Components: BD
- First year: 1898
- Last year: 2008
- Observations: 4
- First position angle: 115
- Last position angle: 117
- First separation: 17.1
- Last separation: 18.1
- Mag first component: 11.62
- Mag second component: 13.0
- Spectral type:
- Primary proper motion RA: -2
- Primary proper motion DEC: 5
- Secondary proper motion RA: 8
- Secondary proper motion DEC: 7
- Durchmusterung:
- Notes: