21138+1045
- Unique Name: 21138+1045HJ 278
- RA: 21 13 48.10
- Dec: +10 45 01.2
- Discoverer: HJ
- Discoverer Number: 278
- Components:
- First year: 1825
- Last year: 2010
- Observations: 9
- First position angle: 255
- Last position angle: 263
- First separation: 20.0
- Last separation: 22.9
- Mag first component: 9.53
- Mag second component: 11.73
- Spectral type: K2
- Primary proper motion RA: -7
- Primary proper motion DEC: -13
- Secondary proper motion RA: -6
- Secondary proper motion DEC: -11
- Durchmusterung: +10 4490
- Notes: