21357+5133
- Unique Name: 21357+5133HJ 3042
- RA: 21 35 39.37
- Dec: +51 33 06.1
- Discoverer: HJ
- Discoverer Number: 3042
- Components:
- First year: 1831
- Last year: 2010
- Observations: 13
- First position angle: 48
- Last position angle: 52
- First separation: 16.0
- Last separation: 19.4
- Mag first component: 9.31
- Mag second component: 10.28
- Spectral type: K0III
- Primary proper motion RA: 11
- Primary proper motion DEC: 11
- Secondary proper motion RA: -2
- Secondary proper motion DEC: -9
- Durchmusterung: +50 3374
- Notes: L
