C28
Open Cluster in Andromeda
About
NGC 752, a loose open cluster in Andromeda about 1,400 light-years away and roughly 1.3 billion years old, old for an open cluster. It is easily seen in binoculars, and a telescope resolves about 60 stars. Also listed as Caldwell 28.
Imaging tips
- It is large: 620–1040 mm on APS-C frames it, and a wider lens suits the full spread.
- One published image used 100 × 30 s frames, unguided, with a light-pollution filter.
- Faint background galaxies show up among the cluster stars in that published image.
- Best around October and November; it climbs to about 78° altitude from 50°N.
Facts
- Size
- 39′
- Magnitude
- 5.7
- Coordinates
- RA 1h 56.9m, Dec +37° 48′
- Framing, APS-C
- 620–1040 mm
- Framing, full frame
- 950–1590 mm
- Best months
- Oct, Nov
- Peak altitude
- 78° from 50°N, 87° from 35°N