21212+1645
- Unique Name: 21212+1645HJ 281
- RA: 21 21 10.26
- Dec: +16 44 49.7
- Discoverer: HJ
- Discoverer Number: 281
- Components:
- First year: 1825
- Last year: 2011
- Observations: 24
- First position angle: 330
- Last position angle: 334
- First separation: 13.5
- Last separation: 14.1
- Mag first component: 9.8
- Mag second component: 11.25
- Spectral type: G0
- Primary proper motion RA: 30
- Primary proper motion DEC: 7
- Secondary proper motion RA: 29
- Secondary proper motion DEC: 8
- Durchmusterung: +16 4505
- Notes: D
