M25 (IC 4725)
Constellation: Sgr
Object Type: Open Cluster
RA: 18h 31m 46s
Dec: -19° 6' 54"
Magnitude: 4.6
Recommended minimum aperture: 50mm
Charts for 100mm Binocular (2.5° aperture circle). Click on a chart to print it.
Location:
If you place γ Sct on the W edge of the field and scan S for 5°, you will find M25 showing distinctly against the background Milky Way.
What You Should See:
This bright rich cluster is unusual for open clusters in that it has few blue-white stars. Of the dozen or so stars that are resolved in big binoculars, note the triangle of deep yellow 7th magnitude stars to the N of the Cepheid variable, U Sgr, which has a mean magnitude range of 6.3 to 7.1 over a period of 6.7 days.
