21101+4359
- Unique Name: 21101+4359HJ 1618AB
- RA: 21 10 04.76
- Dec: +43 59 23.3
- Discoverer: HJ
- Discoverer Number: 1618
- Components: AB
- First year: 1828
- Last year: 2012
- Observations: 8
- First position angle: 172
- Last position angle: 173
- First separation: 15.0
- Last separation: 21.8
- Mag first component: 8.27
- Mag second component: 11.2
- Spectral type: A0
- Primary proper motion RA: 5
- Primary proper motion DEC: 3
- Secondary proper motion RA: -14
- Secondary proper motion DEC: 4
- Durchmusterung: +43 3824
- Notes: