21558+3716
- Unique Name: 21558+3716HO 174AB
- RA: 21 55 48.33
- Dec: +37 15 54.1
- Discoverer: HO
- Discoverer Number: 174
- Components: AB
- First year: 1881
- Last year: 2011
- Observations: 15
- First position angle: 155
- Last position angle: 335
- First separation: 7.3
- Last separation: 7.6
- Mag first component: 10.38
- Mag second component: 10.75
- Spectral type: F2
- Primary proper motion RA: -7
- Primary proper motion DEC: -16
- Secondary proper motion RA: -11
- Secondary proper motion DEC: -13
- Durchmusterung: +36 4710
- Notes: N
