21439+2751
- Unique Name: 21439+2751HO 166
- RA: 21 43 54.25
- Dec: +27 50 48.8
- Discoverer: HO
- Discoverer Number: 166
- Components:
- First year: 1886
- Last year: 2009
- Observations: 177
- First position angle: 124
- Last position angle: 319
- First separation: 0.4
- Last separation: 0.2
- Mag first component: 8.36
- Mag second component: 8.25
- Spectral type: F6V
- Primary proper motion RA: 102
- Primary proper motion DEC: -7
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +27 4145
- Notes: NO
