21555+2942
- Unique Name: 21555+2942HO 609AC
- RA: 21 55 12.36
- Dec: +29 43 34.6
- Discoverer: HO
- Discoverer Number: 609
- Components: AC
- First year: 1905
- Last year: 2012
- Observations: 7
- First position angle: 133
- Last position angle: 133
- First separation: 13.3
- Last separation: 22.1
- Mag first component: 11.5
- Mag second component: 14.32
- Spectral type:
- Primary proper motion RA: -14
- Primary proper motion DEC: -8
- Secondary proper motion RA: 1
- Secondary proper motion DEC: -5
- Durchmusterung:
- Notes: N
