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Astronomy Science Data, POSS-II
M42, Orion Nebula


POSS-II: M42, Orion Nebula
Coordinates/Direction : RA: 05h35m, DEC: -05o23'
Object size : 65' x 60' (whole image 120' x 120')
Object magnitude : 4.0
Object : Messier 42
Date : 1985 to 2000
Lens/telescope : Samuel Oschin Telescope
Film/CCD : POSS-II, credits: STScI
Exp. time : IR 90 minutes, Red 65 minutes, Blue 60 minutes
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Green channel from average of red and blue
Site : Mount Palomar, USA
Comment : Compare what you get from your own telescope, the core of nebula oversaturated. The blue light comes from reflection in the dust from hot blue stars in the neighborhood.
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Orion Nebula

Use of the IR spectra as the green output channel:

POSS-II: M42, Orion Nebula
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : In this image the IR spectra has been used to the green output channel
Comment : Not much sign of IR radiation in the nebula as I expected. But there is one star below that I shall try find data about, see the arrow. It's not in my star chart, only cover stars down to magnitude 10.

Update:
Aladin says this is the NSV 2469 star, no information about IR but the visual is more then 2 magnitudes stronger then the blue spectra.
More to know : Star NSV 2469:
http://simbad.u-strasbg.fr/

Red, IR, Blue channels high pass filtered:

POSS-II: M42, Orion Nebula, highpass filter
Exp. time : IR 90 minutes, Red 65 minutes, Blue 60 minutes
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : High pass filter, radius 50 pixel, green correspond to IR radiation
Comment : With a high pass filter the structures in the nebula will be more visible, the strong green color in center comes from that the red and blue spectra is oversaturated.
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