21317+4508
- Unique Name: 21317+4508AG 272
- RA: 21 31 32.09
- Dec: +45 08 40.4
- Discoverer: AG
- Discoverer Number: 272
- Components:
- First year: 1900
- Last year: 2011
- Observations: 17
- First position angle: 182
- Last position angle: 183
- First separation: 4.1
- Last separation: 4.0
- Mag first component: 10.02
- Mag second component: 10.19
- Spectral type:
- Primary proper motion RA: 8
- Primary proper motion DEC: 13
- Secondary proper motion RA: 7
- Secondary proper motion DEC: 9
- Durchmusterung: +44 3852
- Notes: D
