21010+5923
- Unique Name: 21010+5923MLR 242
- RA: 21 00 55.66
- Dec: +59 24 10.3
- Discoverer: MLR
- Discoverer Number: 242
- Components:
- First year: 1971
- Last year: 2004
- Observations: 9
- First position angle: 282
- Last position angle: 288
- First separation: 2.0
- Last separation: 3.3
- Mag first component: 10.41
- Mag second component: 12.6
- Spectral type: F8
- Primary proper motion RA: 35
- Primary proper motion DEC: -26
- Secondary proper motion RA: -15
- Secondary proper motion DEC: -8
- Durchmusterung: +58 2210
- Notes: