M16, IC 4703, Sh 2-49, Gum 83 Optics:
Planewave 17" CDK f/4.5 Mount:
Planewave Ascension 200HR Camera: FLI-PL6303E
CCD camera Filters:
100 Mins, [20 x 300s] 25 mins each of HaRBGAccessories:
1940mm (0.66 Focal Reducer) guiding via mount using Maxim DL Location:
Mayhill, New Mexico (New Mexico Skies) Date:
May 28th, 2012 Notes:
Image acquisition with Maxim
DL Pro using ACP automation. Processing: Image
calibration, align, and combine in Maxim DL Pro. Levels, curves, crop and resize in Photoshop. HaRGB combine completed using Neil Fleming's method (Ha added in "lighten" blend to each channel - R 100%, G 15%, B 20%, then Ha added layer at 60% opacity in "Lum" blend, redo curves on each new layer).
Calibrated w/6 Darks, 12 Bias, 3 Flats of each filter. CCD temperature was -35C. Image was taken using ITelescope.net's rental scope (T21)
near Mayhill, NM. High Res Version
: http://astromarina.zenfolio.com/img/s8/v83/p1460170460.jpgHa Version
: http://astromarina.zenfolio.com/p264248004/h57096E86#h57096e86Original RGB Version
: http://astromarina.zenfolio.com/p14536770/h57099604#h57099604LRGB Version: http://astromarina.zenfolio.com/p833333387/h5709EE88#h5709ee88Luminance Version: http://astromarina.zenfolio.com/p309790024/h5709BA50#h5709ba50
The Eagle Nebula
(catalogued as Messier 16
, and as NGC 6611
, and also known as the Star Queen Nebula
) is a young open cluster
in the constellation Serpens
, discovered by Jean-Philippe de Cheseaux
in 1745-46. Its name derives from its shape that is thought to resemble an eagle
. It is the subject of the famous "Pillars of Creation
" photograph by the Hubble Space Telescope
that shows pillars of star-forming gas and dust
within the nebula.
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. The tower of gas that can be seen coming off the nebula is approximately 9.5 light-years or about 90 trillion kilometers high.
The brightest star in the nebula (HD 168076) has an apparent magnitude
of +8.24, easily visible with good binoculars. It's actually a binary star
formed of an O3.5V star
plus an O7.5V companion.
The cluster associated with the nebula has approximately 460 stars, the brightest of spectral class
O, a mass of roughly 80 solar masses
, and a luminosity up to 1 million times that of the Sun
. Its age has been estimated to be 1-2 million years
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.