21577+2015
- Unique Name: 21577+2015STF2849
- RA: 21 57 43.20
- Dec: +20 14 29.9
- Discoverer: STF
- Discoverer Number: 2849
- Components:
- First year: 1830
- Last year: 2010
- Observations: 41
- First position angle: 272
- Last position angle: 244
- First separation: 1.1
- Last separation: 1.7
- Mag first component: 8.69
- Mag second component: 10.37
- Spectral type: G5
- Primary proper motion RA: 50
- Primary proper motion DEC: -3
- Secondary proper motion RA: 50
- Secondary proper motion DEC: -3
- Durchmusterung: +19 4834
- Notes: