21409+4205
- Unique Name: 21409+4205TDT3104
- RA: 21 40 52.24
- Dec: +42 05 10.2
- Discoverer: TDT
- Discoverer Number: 3104
- Components:
- First year: 1991
- Last year: 1991
- Observations: 1
- First position angle: 233
- Last position angle: 233
- First separation: 2.2
- Last separation: 2.2
- Mag first component: 12.2
- Mag second component: 12.71
- Spectral type:
- Primary proper motion RA: -5
- Primary proper motion DEC: -3
- Secondary proper motion RA: -5
- Secondary proper motion DEC: -3
- Durchmusterung:
- Notes: