21042+3542
- Unique Name: 21042+3542SEI1387
- RA: 21 04 12.42
- Dec: +35 41 23.1
- Discoverer: SEI
- Discoverer Number: 1387
- Components:
- First year: 1896
- Last year: 2002
- Observations: 6
- First position angle: 129
- Last position angle: 133
- First separation: 10.0
- Last separation: 9.3
- Mag first component: 11.2
- Mag second component: 11.6
- Spectral type:
- Primary proper motion RA: 0
- Primary proper motion DEC: -3
- Secondary proper motion RA: -7
- Secondary proper motion DEC: -4
- Durchmusterung:
- Notes: N
