NGC 2174

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 Largest Image (1.5 meg), 2109 x 1393 pixels

Description: This emission nebula, NGC 2174, surrounds a loose cluster, NGC 2175. It was discovered in 1877 by Jean Marie Stephan. Although star formation in some areas of the universe is triggered by expanding ionization fronts around massive stars, NGC 2174/5 has several apparently detached clusters formed instead by hierarchical collapse. This nebula is rather drab in RGB, as can be seen in a mouse-over of this image with an RGB version. In addtition, there is a small animation (2.5 megs) of the RGB and narrowband image.
Constellation: Orion
Distance: 6400 light years
Apparent Size: 40' diameter
Dates: 14, 16, 21, 26, 29, 30 october; 3, 17 november 2006
Equipment: AP155 @ f/7, AP1200, ST10XME
Exposure: SII....(Red).....8 hours

Ha....(Green)..2 hours

OIII..(Blue)....7 hours

Astrodons, unbinned