20121+3603
- Unique Name: 20121+3603SEI 990
- RA: 20 12 03.70
- Dec: +36 02 31.0
- Discoverer: SEI
- Discoverer Number: 990
- Components:
- First year: 1896
- Last year: 2002
- Observations: 9
- First position angle: 297
- Last position angle: 295
- First separation: 26.8
- Last separation: 26.7
- Mag first component: 10.33
- Mag second component: 10.82
- Spectral type: F8III
- Primary proper motion RA: 15
- Primary proper motion DEC: -18
- Secondary proper motion RA: 14
- Secondary proper motion DEC: -18
- Durchmusterung:
- Notes: