18121+3559
- Unique Name: 18121+3559ES 2171
- RA: 18 11 26.86
- Dec: +35 59 27.0
- Discoverer: ES
- Discoverer Number: 2171
- Components:
- First year: 1925
- Last year: 2002
- Observations: 3
- First position angle: 70
- Last position angle: 69
- First separation: 3.8
- Last separation: 3.9
- Mag first component: 12.0
- Mag second component: 12.34
- Spectral type:
- Primary proper motion RA: -8
- Primary proper motion DEC: 30
- Secondary proper motion RA: 36
- Secondary proper motion DEC: 7
- Durchmusterung: +35 3175
- Notes: I
