Caldwell 9 (C 9)

Introduction | Map | My Own Photos | My Own Observations | References

On this page I collect my observations of the galactic nebula Caldwell 9 (Cave Nebula; Sh2-155) in the constellation Cepheus.

Introduction

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).

NGC 7635 (Bubble Nebula)		M 52 (NGC 7654)		NGC 7538 (Northern Lagoon Nebula)		Caldwell 9 (Cave Nebula, Sh2-155)
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: ---		Size: 50' x 30' (Wikipedia) Distance: 2,400 light years (Wikipedia) Rating: ---

Map

The galactic nebula Caldwell 9 (Cave Nebula) in the constellation Cepheus (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)

My Own Photos

eVscope


C 9 - Sep 8, 2020	C 9 - Sep 8, 2020	C 9 - Sep 8, 2020

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

C 9 - Sep 9, 2020	C 9 - Sep 9, 2020	C 9 - Sep 9, 2020

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

C 9 - Sep 15, 2020	C 9 - Sep 15, 2020, photo left processed

Vespera Pro


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)

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)

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)

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)

My Own Observations

Observations September 2020

September 8, 2020 (Mühlhausen/Kraichgau: eVscope): C 9 photographed - faint
September 9, 2020 (Mühlhausen/Kraichgau: eVscope): C 9 photographed - even fainter
September 15, 2020 (Mühlhausen/Kraichgau: eVscope): C 9 photographed - faint

Observations August 2024

August 26, 2024 (Mühlhausen/Kraichgau: Vespera Pro): C 9 photographed as a mosaic together with M 52, NGC 7635, and NGC 7538; very faint
August 27, 2024 (Mühlhausen/Kraichgau: Vespera Pro): C 9 photographed with Dual Band Filter; faint (4,25 h)
August 28, 2024 (Mühlhausen/Kraichgau: Vespera Pro): C 9 photographed; faint (1:40 h)

References

Caldwell 9 (Wikipedia): en.wikipedia.org/wiki/Sh2-155
NGC 7538 (Wikipedia): en.wikipedia.org/wiki/NGC_7538
NGC 7635 (Wikipedia): en.wikipedia.org/wiki/NGC_7635
Messier 52 (Wikipedia): en.wikipedia.org/wiki/Messier_52