Ptolemy's Cluster (M7)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 22 arcminutes across.
Finder chart
Click and drag the chart above to pan around the sky, or use the mouse wheel to zoom.
Click to enlarge.
From Cambridge , Ptolemy's Cluster is not readily observable since it lies so far south that it will never rise more than 12° above the horizon.
Begin typing the name of a town near to you, and then select the town from the list of options
which appear below.
|
Name
Ptolemy's Cluster (M7)
|
Object type
Open cluster
|
Position
| Right ascension: | 17h53m [3] |
| Declination: | −34°47' [3] |
| Constellation: | Scorpius |
| Magnitude: | 3.30 (V) [5] 3.45 (B) [3] |
| Distance: | 301.0 parsec 981.3 lightyrs [2] |
| B-V Color (mag): | 0.15 |
Derived quantities
| Absolute mag (V): | -4.09 |
Sources
Visibility from Cambridge
All times shown in Cambridge local time.
Events
| 20 Jun 2025 | – The Ptolemy cluster is well placed |
| 20 Jun 2026 | – The Ptolemy cluster is well placed |
| 20 Jun 2027 | – The Ptolemy cluster is well placed |
| 20 Jun 2028 | – The Ptolemy cluster is well placed |
| 20 Jun 2029 | – The Ptolemy cluster is well placed |
| 20 Jun 2030 | – The Ptolemy cluster is well placed |
| 20 Jun 2031 | – The Ptolemy cluster is well placed |
| 20 Jun 2032 | – The Ptolemy cluster is well placed |