21101+0118
- Unique Name: 21101+0118HDO 318
- RA: 21 10 06.52
- Dec: +01 17 47.2
- Discoverer: HDO
- Discoverer Number: 318
- Components:
- First year: 1877
- Last year: 2008
- Observations: 19
- First position angle: 318
- Last position angle: 313
- First separation: 0.7
- Last separation: 1.1
- Mag first component: 9.58
- Mag second component: 9.81
- Spectral type: A3
- Primary proper motion RA: 15
- Primary proper motion DEC: -9
- Secondary proper motion RA: 15
- Secondary proper motion DEC: -9
- Durchmusterung: +00 4674
- Notes: