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NGC 752
open cluster in Andromeda
NGC 752 is an old, large open cluster in Andromeda, about a billion years old. It is very wide, with a hundred or more stars spread over about 50 arcminutes. It looks good in a wide-field frame, especially next to the Andromeda Galaxy.
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// Key facts
- Catalog
- NGC 752
- Also known as
- C 28, Caldwell 28
- Type
- open cluster
- Constellation
- Andromeda
- Size
- 50′ across
- Brightness
- Magnitude 5.7
- Distance
- about 1,300 light-years
- Peak month (any location)
- Oct
- Typical prime months
- Aug to Jan
- Difficulty
- Beginner
- Filter
- No filter (broadband)
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How to image NGC 752
- Use 300 to 600 mm; it spans about 50 arcminutes.
- No filter is needed; capture star colors with short exposures.
- It is in the same part of the sky as M31 and M34.
Framing: what focal length?
The focal length at which NGC 752 spans about 60% of the long side of the sensor, leaving room around it. Treat it as a starting point; the right framing is a matter of taste.
| Sensor | Focal length |
|---|---|
| 1-inch sensor (13.2 mm) | about 540 mm |
| APS-C (23.5 mm) | about 970 mm |
| Full frame (36 mm) | about 1490 mm |
How high does it climb from your latitude?
The highest point NGC 752 reaches in the sky. Above about 60° is excellent, 30° to 60° is workable, and under 30° you are looking through a lot of air.
| Latitude | Highest point | Rating |
|---|---|---|
| 55°N (Scotland, Alaska) | 73° | High in the sky |
| 45°N (Minneapolis, Milan) | 83° | High in the sky |
| 35°N (Los Angeles, Tokyo) | 87° | High in the sky |
| 25°N (Miami, Cairo) | 77° | High in the sky |
| 35°S (Sydney, Santiago) | 17° | Stays low |
Also worth imaging
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