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Astronomy Science Data, POSS-II
M45, Pleiades open star cluster


POSS-II: M45, Pleiades
Coordinates/Direction : RA: 03h47m, DEC: +24o07'
Object size : 110' (whole image 96' x 120')
Object magnitude : 1.6
Object : Messier 45
Date : 1985 to 2000
Lens/telescope : Samuel Oschin Telescope
Film/CCD : POSS-II, credits: STScI
Exp. time : IR 60 minutes, Red 70 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.
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Pleiades

Use of the IR spectra as the green output channel:

POSS-II: M45, Pleiades
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : In this image the IR spectra has been used to the green output channel
Comment : The Pleiades is light up from hot blue stars, the red radiation is almost nothing, and either there is any IR radiation.

But there is one star that looks to have strong IR radiation, see the green star where the arrow is. I come back about that one.

Update:
Now I have the information from Aladin, this is the V* SY Tau star, a long period variable star.
More to know : Star V* SY Tau:
http://simbad.u-strasbg.fr/
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