Open Cluster NGC 6633 in Ophiuchus - a photo on Flickriver

            NGC 6633 is a large bright open cluster in the constellation Ophiuchus. NGC 6633 is also known as the Tweedledum Cluster (paired with IC 4756 as Tweedledee), also as the Captain Hook Cluster. It is also designated Collinder 380 or Melotte 201. Nearly as large as the full moon, the cluster contains 38 known stars and shines with a total magnitude of 4.6; the brightest star is of mag 7.6. Its age has been estimated at 660 million years.

Observation data (J2000.0 epoch)
Right ascension: 18h 27.7m
Declination: 6° 34′
Apparent magnitude (V): 4.6
Apparent dimensions (V): 27’

Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO ASI2600MC camera running at 0F, 54x60 seconds guided exposures, Sky-Watcher EQ6R-Pro pier mounted, ZWO EAF and ASIAir Pro, processed in DSS and PixInsight. Image Date: August 18, 2023. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).
   

Taken in: United States / Pennsylvania / Packer Township (show map)

Taken on: August 19, 2023

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Tom Wildoner

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Sets appears in: • Open Clusters • ZWO ASI2600MC-P Camera more » • Astrophotos Using the Sky Watcher Esprit 120ED • The Dark Side Observatory « less

Groups appears in: • Astronomy • Deepsky more » • Galaxies & Stars Group ( Planets, Moons & Comets too!) • Deep Space Astrophotography • Astronomia • SightsAbove • Amateur Astronomy • Astronomical Images • Astronomy, Stars, Planets and Space • ASTROPHOTO • Astronomy for all • Universe and planets • The Lights Of The Night Sky • Astronomy Photos • Backyard Astronomy • Universe Today • Backyard Astrophotography • Astronomy and Space Science - For Explorers of All Ages • Wonders of the Sky • Space stuff • APOD Submissions • Digital Astrophotography • Astronomy Central • Amateur Astro-Photography • Astronomy 24/7 • The Universe: Astronomy Photography • ZWO ASI Astronomy • The Dark Side Observatory • Flickrology • Astro Imaging • ASI2600MC « less

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