20257+4004
- Unique Name: 20257+4004POP 199AC
- RA: 20 25 44.56
- Dec: +40 03 59.0
- Discoverer: POP
- Discoverer Number: 199
- Components: AC
- First year: 1892
- Last year: 2009
- Observations: 7
- First position angle: 245
- Last position angle: 245
- First separation: 58.8
- Last separation: 59.7
- Mag first component: 8.73
- Mag second component: 10.7
- Spectral type: A0
- Primary proper motion RA: 0
- Primary proper motion DEC: -11
- Secondary proper motion RA: -9
- Secondary proper motion DEC: -8
- Durchmusterung: +39 4183
- Notes: N
