Ptolemy's Cluster (Open Cluster)
Red-band 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 Ashburn , Ptolemy's Cluster is not readily observable since it lies so far south that it will never rise more than 16° 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
|
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
| 19 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 |
| 19 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 |