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On this page I collect my observations of the open star cluster NGC 6633 in the constellation Ophiuchus.
The open star cluster NGC 6633 in the constellation Ophiuchus can, according to Stoyan already been seen with the naked eye. Stoyan even states that this cluster is comparable to M 11 and M 16.
Size: 20' (Stoyan)
Distance: 1,000 light years (Stoyan)
Rating: *** (Stoyan)
NGC 6633 in the constellation Ophiuchus (top left) (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
NGC 6633 - May 31, 2020
NGC 6633 - May 31, 2020, processed