NGC 5367

In 2017, during a stay at the astrofarm Tivoli in Namibia, I imaged the beautiful emission nebula NGC 5367 using the equipment of a rented observatory. The exceptionally dark skies of the Namib Desert and the excellent observing conditions provided an ideal opportunity to record the delicate structure of this relatively little-known southern deep-sky object. The resulting image reveals the nebula’s intricate clouds of glowing gas embedded within the rich star fields of the southern Milky Way.

NGC 5367 is located in the constellation Centaurus, at an estimated distance of approximately 4,500 light-years. It is an emission nebula associated with an active region of star formation, where young, hot stars illuminate the surrounding hydrogen gas. The nebula shines predominantly in the characteristic Hα emission line, produced when ultraviolet radiation from massive O- and B-type stars ionizes the surrounding interstellar medium.

The brightest part of the nebula is energized by the massive young star HD 119712, whose intense ultraviolet radiation excites the surrounding gas and gives the nebula its characteristic glow. Powerful stellar winds from this hot star continue to shape the surrounding cloud, producing bright ionization fronts, cavities, and delicate filamentary structures that become visible in deep images.

Like many emission nebulae, NGC 5367 contains dense molecular clouds and dark dust lanes where new stars are still forming. These cold, dusty regions are the raw material from which future generations of stars will emerge. Infrared observations have revealed embedded young stellar objects hidden within the dust, making the nebula an excellent laboratory for studying the earliest stages of stellar evolution.

Deep images also reveal the rich stellar background of the southern Milky Way, emphasizing the nebula’s location within one of the Galaxy’s most active star-forming environments. Numerous foreground stars and faint background objects add depth to the field, creating a striking contrast with the glowing hydrogen clouds.

From a scientific perspective, NGC 5367 illustrates the close relationship between massive stars and the interstellar medium. The radiation and stellar winds from newly formed stars not only illuminate the surrounding gas but also compress nearby molecular clouds, potentially triggering further episodes of star formation. Objects such as NGC 5367 therefore provide valuable insight into the ongoing cycle of stellar birth and the evolution of giant molecular clouds.

The image obtained in 2017 beautifully captures the subtle structure of this lesser-known southern nebula and demonstrates the advantages of imaging from one of the world’s premier astronomical locations. The combination of professional equipment, pristine Namibian skies, and careful image processing produced a detailed portrait of one of the many hidden treasures of the southern Milky Way.

For the 2017 data the calibration and registration, as well as the final image processing, were all done with PixInsight.

The field also contains a remarkable number of distant background galaxies and quasars, illustrating the enormous depth of the universe captured in a single image. I annotated several of these fascinating objects, with the most distant being WISEA J135558.48-401549.3, which has a redshift of z = 2.4. This corresponds to a look-back time of approximately 10.8 billion years, meaning the light recorded in this image began its journey when the Universe was only about 3 billion years old.

The images were taken with the following equipment:

• Date: 2017
• Location: Tivoli, Namibia
• Telescope: 12″ ASA Astrograph
• Focal length [mm]: 1076
• Focal ratio: 3.6
• Mount: ASA DDM85
• Camera: FLI Microline ML16200
• Filter: L:R:G:B
• Exposure time [min]: 185:60:55:60
• Resolution: 1.14″/px