Messier 16 Multiband Experience


Multiband Experience

In a special set of articles (which will be able to create a real section in the future), experiences, multi-band travels and, naturally, near infrared, will be collected on some of the well-known objects of the northern sky.

The subjects on which this analysis is underway are M17 Swan Nebula, IC 1318, Messier 8, Messier 16 Eagle Nebula. Many data are dating over time (eg those of IC 1318), while in this article will be presented the most recent ones related to:



Messier 16  

It is interesting to note first of all the difference between a classic 180 minute hydrogen recovery with a hyperstar hypnotic C11 and a monochromatic ccd H694 on the night of July 14, 2017, and a 138-minute hydrogen intake obtained with the Same instrumentation on 17 July 2017.

As well-known, infrared radiation, it is able to pass the rarefat hydrogen bundle. At the wavelength of 807 nm the nebulizer is therefore almost transparent. It is really fascinating to witness the appearance of dozens of where only shortly before (in hydrogen) there was only an impenetrable fog.

Trying to compose a trichrome shifted to the infrared band, ie by placing the infrared as a red channel in the green channel as a green channel (an 84 minute addition obtained on July 16) and as a blue channel the hydrogen gets a rather unusual chrominance where Each dominant will indicate the region where a given chemical element is predominant or comuqnue better evidenced. Note the presence of red stars in the suburbs of the investigated region.


Instead composing a mapped color trichrome (Ha, SII, OIII) we will get the typical coloring of this type of technique. Third oxygen is the result of an integration of 80 minutes on 18 July.

Explanation: The Eagle Nebula (catalogued 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,[2][3] an area made famous as the “Pillars of Creation” photographed by the Hubble Space Telescope. The nebula contains several active star-forming gas and dustregions, including the Pillars of Creation.

The Eagle Nebula is part of a diffuse emission nebula, or H II region, which is catalogued 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.[4]

The cluster associated with the nebula has approximately 8100 stars, which are mostly concentrated in a gap in the molecular cloud to the north-west of the Pillars.[5] The brightest star (HD 168076) has an apparent magnitude of +8.24, easily visible with good binoculars. It is actually a binary star formed of an O3.5V star plus an O7.5V companion.[6] This star has a mass of roughly 80 solar masses, and a luminosity up to 1 million times that of the Sun. The cluster’s age has been estimated to be 1–2 million years.[7]

The descriptive names reflect impressions of the shape of the central pillar rising from the southeast into the central luminous area. The name “Star Queen Nebula” was introduced by Robert Burnham, Jr., reflecting his characterization of the central pillar as the Star Queen shown in silhouette.Credit: Wikipedia


Optics:Celestron C11 @  f2, hyperstar mode 
Mount:Avalon M1 Fast Reverse
Camera:SX H694 unbinning
Location:Viterbo, W. Herschel obs.
Exposure:Lum  Hydrogen: 180 min  Oxigen 80 min ; Sulfur 84 min;  Red : 38 min;  Blue: 52 min
Cooling: avg – 5°
Acquisition: Astroart, Sequence Generator Pro, PHD2, Avalon Star Go
Processing: Iris, PS 3, Pix Insight, CCD sharp, 
SQM-L: 19.2
Note um: 78%



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