![]() NGC 3293 is the oldest and furthest from Trumpler 14, indicating sequential and ongoing star formation. Trumpler 15, Collinder 228, Collinder 232, NGC 3324, and NGC 3293 are also considered members of the association. Trumpler 16 is the home of WR 25, currently the most luminous star known in our Milky Way galaxy, together with the less luminous but more massive and famous Eta Carinae star system and the O2 supergiant HD 93129A. Trumpler 14 is one of the youngest known star clusters at half a million years old. Carina OB1 encompasses the star clusters Trumpler 14 and Trumpler 16. The nebula has within its boundaries the large Carina OB1 association and several related open clusters, including numerous O-type stars and several Wolf–Rayet stars. The nebula is approximately 8,500 light-years (2,600 pc) from Earth. The Carina Nebula or Eta Carinae Nebula (catalogued as NGC 3372) is a large, complex area of bright and dark nebulosity in the constellation Carina, and it is located in the Carina–Sagittarius Arm. There has been no appreciable change in this quintuple system since the first measures were made in 1875. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 arcsec. Burnham, whose bright component is identified as the highly luminous O6 spectral class star, HD 5005 or HIP 4121. Edward Emerson Barnard discovered the nebula in August 1883, describing it as "a large faint nebula, very diffuse." Multiple star 'B 1' or β 1 was later discovered by S. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character. A recent distance from radio parallaxes of water masers at 22 GHz made during 2014 is estimated it lies 2.82☐.20 kpc. ![]() It collectively forms Sh2-184, spanning over a larger area of 40 arcmin. This 20×30 arcmin sized nebulosity is also associated with open cluster IC 1590, several Bok globules and the multiple star, B 1. Size (arcmin): 5×3.NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm. Location: New Mexico Skies, Mayhill, NM, USA This image was taken at the suggestion of Don Goldman. A large dithering was used in order to try to grab as much detail as possible of the “ladder-like” features. Halpha images did not add any valuable information, just like the Luminance images. ![]() Several trials about the right exposure time ended up in taking 200 second RGB images. The capture of this object was not a straight forward process. ![]() ![]() The image below shows the explanation of the unusual “rectangular looking” features of this nebula. This produces the effect of “ladder rungs” that, being circles seen edge on, creates the illusion of seeing a straight “rung”. The flow of mass is not constant and happens in irregular periods of about a few hundred years. The mechanism for this formation involves the creation of a torus (doughnut-shaped) of gas around the star, that is seen edge on as well as a pair of “wine glass-shaped” cups, along which matter is flowing from the parent star. Actually, being this the precursor stage for a planetary nebula, it is called a “proto-planetary” nebula. This star will end up the same way, but meanwhile, the combined effect of expanding its shells and the presence of the companion star, is forming this weird structure. This is a stage, that the solitary stars undergo by slowly producing a planetary nebula. The binary star system conforming HD 44179 involves a Sun-like star that is running out of its primary fuel and expanding its outer shells enough for the second star (orbiting the primary one every 319 days) to start to gravitationally pull some of its mass. Initially, when this nebula was discovered in 1973, its structure was much of a mystery. At least another such nebula is known, the Red Square Nebula, around the star MWC 922, in the constellation Serpens. The Red Rectangle Nebula is a very peculiar (but not unique) structure around a binary system catalogued as HD 44179 in the constellation Monoceros. Click on the image for a full resolution version ![]()
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