Ptolemy's Cluster (M7)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 22 arcminutes across.
Finder chart
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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.
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|
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 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 |
| 20 Jun 2033 | – The Ptolemy cluster is well placed |