Ptolemy's Cluster (Open Cluster)

Image of Ptolemy's Cluster
Red-band image from the Second Digitized Sky Survey (DSS2), measuring 22 arcminutes across.
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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.

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Name Ptolemy's Cluster
Object Type Open Cluster
Other Names
M 7
NGC 6475
Cr 354
Mel 183
Magnitude:3.30 (V)[2]
3.45 (B)[1]
B-V Color (mag):0.15
Right Ascension:17h53m [1]
Declination:-34°47' [1]
Distance:301.0 parsec
981.3 lightyrs [1]
Derived Quantities
Absolute Mag (V):-4.09
20 Jun 2019  –  M7 is well placed
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




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