Ptolemy's Cluster (Open Cluster)
Red-band 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
|
Object Type
Open Cluster
|
Position
| Constellation: | Scorpius |
| Magnitude: | 3.30 (V) [3] 3.45 (B) [2] |
| B-V Color (mag): | 0.15 |
| Right ascension: | 17h53m [2] |
| Declination: | -34°47' [2] |
| Distance: | 301.0 parsec 981.3 lightyrs [1] |
Derived Quantities
| Absolute mag (V): | -4.09 |
Events
| 20 Jun 2020 | – M7 is well placed |
| 20 Jun 2021 | – M7 is well placed |
| 20 Jun 2022 | – M7 is well placed |
| 20 Jun 2023 | – M7 is well placed |
| 20 Jun 2024 | – M7 is well placed |
| 20 Jun 2025 | – M7 is well placed |
| 20 Jun 2026 | – M7 is well placed |
| 20 Jun 2027 | – M7 is well placed |