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On this page I collect my observations of the galactic nebula Caldwell 9 (Cave Nebula; Sh2-155) in the constellation Cepheus.
The galactic nebula Caldwell 9 (Cave Nebula; Sh2-155) in the constellation Cepheus is a diffuse nebula within a larger nebula complex containing emission, reflection, and dark nebulosity.
With the Vespera Pro, it can be observed as a mosaic together with M 52, NGC 7538 (Northern Lagoon Nebula), and NGC 7635 (Bubble Nebula).
| Caldwell 9 (Cave Nebula, Sh2-155) | NGC 7635 (Bubble Nebula) | M 52 (NGC 7654) | NGC 7538 (Northern Lagoon Nebula) | |||
| Size: 50' x 30' (Wikipedia) Distance: 2,400 light years (Wikipedia) Rating: --- |
Size: 15' x 8' (Wikipedia) Distance: 8,800 (Wikipedia) Rating: * (Stoyan) |
Size: 10' (Stoyan) Distance: 4,600 light years (Stoyan) Rating: *** (Stoyan) |
Size: 9' x 6' (Wikipedia) Distance: 9,900 (Wikipedia) Rating: --- |
The galactic nebula Caldwell 9 (Cave Nebula) in the constellation Cepheus (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
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C 9 - Sep 8, 2020 |
C 9 - Sep 8, 2020 |
C 9 - Sep 8, 2020 |
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C 9 - Sep 8, 2020, photo on top processed |
C 9 - Sep 8, 2020, photo on top processed |
C 9 - Sep 8, 2020, photo on top processed |
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C 9 - Sep 9, 2020 |
C 9 - Sep 9, 2020 |
C 9 - Sep 9, 2020 |
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C 9 - Sep 9, 2020, photo on top processed |
C 9 - Sep 9, 2020, photo on top processed |
C 9 - Sep 9, 2020, photo on top processed |
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C 9 - Sep 15, 2020 |
C 9 - Sep 15, 2020, photo left processed |
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NGC 7538 with M 52, NGC 7635, and C9, Aug 26, 2024 - 2400p (907 frames = 2.5 h), Dual Band Filter, processed |
NGC 7538 with M 52, NGC 7635, and C9, Aug 26, 2024 - 2400p (907 frames = 2.5 h), Dual Band Filter, processed and denoised (DN) |
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NGC 7635 with M 52, NGC 7538, and C9, Aug 26, 2024 - 2400p (907 frames = 9070s, about 2.5 h), processed and denoised (DN), background processed |
NGC 7635 with M 52, NGC 7538, and C9, Aug 26, 2024 - 2400p, marked with skysolver.app |
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C 9, Aug 26, 2024 - 1800 (907 frames = 2,5h), Dual Band Filter, section from mosaic, processed |
NGC C 9, Aug 26, 2024 - 1800 (907 frames = 2,5h), Dual Band Filter, section from mosaic, processed, denoised (DN) |
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C 9, Aug 27, 2024 - 2000 (1525 frames = 4,25 h), Dual Band Filter, processed |
C 9, Aug 27, 2024 - 2000 (1525 frames = 4,25 h), Dual Band Filter, processed, denoised (DN) |
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C 9, Aug 28, 2024 - 2000 (600 frames = 1:40 h), processed |
C 9, Aug 28, 2024 - 2000 (600 frames = 1:40 h), processed, denoised (DN) |
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C 9, Oct 19, 2026 - original (2h) |
C 9, Oct 19, 2026 - original (2h), processed with Stellar Studio |
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C 9, Oct 19, 2026 - original (2h), processed with Stellar Studio, and further processed |
C 9, Oct 19, 2026 - original (2h), processed with Stellar Studio, further processed, additionally denoised (TP) and even further processed |
