17564+1820
- Unique Name: 17564+1820MCA 49Aa,Ab
- RA: 17 56 24.41
- Dec: +18 19 37.3
- Discoverer: MCA
- Discoverer Number: 49
- Components: Aa,Ab
- First year: 1979
- Last year: 2009
- Observations: 19
- First position angle: 58
- Last position angle: 92
- First separation: 0.1
- Last separation: 0.1
- Mag first component: 6.6
- Mag second component: 0.0
- Spectral type: A0III
- Primary proper motion RA: 20
- Primary proper motion DEC: -8
- Secondary proper motion RA:
- Secondary proper motion DEC:
- Durchmusterung: +18 3500
- Notes: N
