Featured Deep-Sky Object - Gum 15 Nebula

As Insight Observatory's affiliate 12.5" f/9 Ritchey-Chretien (ATEO-3) remote telescope, located at Deep Sky Chile, undergoes some upgrading in preparation for its next round of imaging for Starbase and education projects, we thought it would be appropriate to feature an interesting deep-sky object imaged on ATEO-3 in the past year.

Gum 15, an emission nebula, is a little-known object located in the southern constellation Vela at a distance of about 3,000 light-years from Earth. The glowing cloud is a perfect example of an HII region. This nebula has many similarities to the more famous HII region, Messier 20, the Trifid Nebula, located in the constellation Sagittarius. It is shaped by aggressive winds flowing from the stars within and around it. The bright star in the center of the nebula is HD 74804, a double star.

Gum 15 Nebula, located in the southern constellation Vela, imaged on ATEO-3. Image data acquired by
Franck Jobard and processed by Utkarsh Mishra.  The image set is available for download on Starbase.

The blueish wisps are dusty streamers from the scattering of blue light of the star HD 74804. Dark dust all throughout the nebula is detected through a thick lane in the middle of the nebula. The material is perhaps behind the star, on the far side from our viewpoint, therefore we don't see the scattered light. Also, to the lower left, you can see what looks like the bright outline of a dark mountain, pointing inward toward the star. That feature is designated SFO 58.

Gum 15 Nebula image data is currently available for subscription and downloading in Insight Observatory's image set repository, Starbase. Below are the image parameters available for the nebula image set.

ATEO-3 - 12.5" f/9 Quasar Ritchey-Chretien:

• Gum 15 - Luminance (2020): Nebula in Vela - 12 Hours 20 Minutes 
• Gum 15 - RGB (2020): Nebula in Vela - 6 Hours 40 Minutes

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Sources: Wikipedia, European Southern Observatory (ESO), and Bad Astronomy - Phil Plait.

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Mosaic of Reflection Nebula NGC 6914

Recently we wrote a post covering a collaborative on a mosaic of NGC 7023, The Iris Nebula, imaged by accomplished astrophotographers, Paul C. Swift and Carmelo Falco. This is an image that Insight Observatory was fortunate to be able to contribute to by providing luminance data from the 16" f/3.7 astrograph reflector (ATEO-1). Paul and Carmelo have since produced another astonishing mosaic image, NGC 6914. This deep-sky object is a reflection nebula located approximately 6,000 light-years away in the constellation Cygnus and the plane of our Milky Way Galaxy. The nebula was discovered by Édouard Stephan on August 29, 1881.

This mosaic of the reflection nebula NGC 6914 is made up of data from different focal lengths. 380mm, 1330, 1525mm, and 3400mm. Image processed by Paul C. Swift.

The final image data was processed by Paul C. Swift with data acquired from his backyard with a VSD Vixen 380mm & AG14 1330mm Newtonian astrograph. The filter wheel is an SX-46 with an SX Maxi wheel from Starlight Xpress Ltd. A formatted array of 27 x 21.6 mm and 6uM square pixels. Newtonian telescope at 1330mm and Chroma Filters RGBL mounted on a Paramount MX.

Data for the central area of the nebula was imaged by Camelo Falco using his Ritchey-Chretien C 410mm f7.8 customized at 3400mm and an Apogee Aspin GG16m imaging camera. The mount is a customized RM500 Mount. Carmelo's guiding system is an Orion SteadyStar + Lodestar. The filter used by Carmelo was a Baader LRGB set.

Finally, additional Luminance data for outer areas was taken from Insight Observatory's 16" f/3.7 Astrograph reflector 1525mm (ATEO-1).

The Three imaging systems were used to collect data on NGC 6914, a reflection nebula in Cygnus. Carmelo Falco's 16" f/7.8 Ritchey-Chretien (left), Paul Swift's VSD Vixen 380mm & AG14 1330mm Newtonian astrograph (above right), and Insight Observatory's 16" f/3.7 Dream astrograph reflector, ATEO-1, (lower right).

From the image of NGC 6914 processed by Paul, obscuring interstellar dust clouds appear in silhouette while reddish hydrogen emission nebulae, along with the dusty blue reflection nebulae, fill the cosmic canvas. Ultraviolet radiation from the massive, hot, young stars of the extensive Cygnus OB2 association ionizes the region's atomic hydrogen gas, producing the characteristic red glow as protons and electrons recombine. Embedded Cygnus OB2 stars also provide the blue starlight strongly reflected by the dust clouds. The nearly 1-degree wide telescopic field of view spans about 100 light-years at the estimated distance of NGC 6914.

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Eagle Nebula Collaboration Project

Insight Observatory's remote telescope was recently involved in a deep-sky imaging collaboration between two experienced astrophotographers. Utkarsh Mishra and Zhuoqun Wu teamed up to combine and process datasets resulting in the image below of Messier 16, The Eagle Nebula. The Luminance, Red, Green, and Blue data was acquired by Utkarsh with Insight Observatory's 16" astrograph reflector (ATEO-1) hosted in Pie Town, New Mexico, and the H-Alpha data was taken from Chilescope by Zhuoqun using a 20" ASA Newtonian astrograph. The data files were stacked using PixInsight and processed in Adobe Photoshop.

Insight Observatory has recently had an increase in deep-sky dataset subscribers that are involved in image collaborations with other astrophotographers using equipment at other locations around the world. Very exciting!

Messier 16, the Eagle Nebula imaged by Utkarsh Mishra and Zhuoqun Wu. 10 300-second Luminance, 14 300-second Red, 11 300-second Green, and 10 300-second Blue frames taken from ATEO-1 along with 50-Minutes of H-Alpha data acquired from Chilescope.

The Eagle Nebula (cataloged as Messier 16 or M16, and as NGC 6611, and also known as the Star Queen Nebula and The Spire) is a young open cluster of stars in the constellation Serpens, discovered by Jean-Philippe de Chéseaux in 1745–46. Both the "Eagle" and the "Star Queen" refer to visual impressions of the dark silhouette near the center of the nebula, an area made famous as the "Pillars of Creation" imaged by the Hubble Space Telescope. The nebula contains several active star-forming gas and dust regions, including the aforementioned Pillars of Creation.

The Eagle Nebula is part of a diffuse emission nebula, or H II region, which is cataloged as IC 4703. This region of active current star formation is about 7000 light-years distant. A spire of gas that can be seen coming off the nebula in the northeastern part is approximately 9.5 light-years or about 90 trillion kilometers long.

Source: Wikipedia

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