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Astronomy Science Data, POSS-I
M42, Orion Nebula


POSS-I: 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 : 1948 to 1959
Lens/telescope : Samuel Oschin Telescope
Film/CCD : POSS-I, credits: STScI
Exp. time : Red 50 minutes, Blue 8 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.
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Orion Nebula

Blue channel high pass filtered:

POSS-I: M42 Orion Nebula, high pass filtered
Exp. time : Blue plate 8 minutes
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : High pass filter, radius 50 pixel
Comment : With a high pass filter it's easier to see the structure in the filaments of the nebula, this is only the POSS-I blue plate, the red plate looks almost the same. The black center part because it's overexposed. There is a lot of star births in this nebula which can be seen in the Hubble data.
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