| Coordinates/Direction : | RA: 05h34m, DEC: +22o00' |
| Object size : | 420" x 290" (whole image 60' x 60') |
| Object magnitude : | 8.4 |
| Object : | Messier 1 |
| Date : | 1985 to 2000 |
| Lens/telescope : | Samuel Oschin Telescope |
| Film/CCD : | POSS-II, credits: STScI |
| Exp. time : | IR 65 minutes, Red 65 minutes, Blue 65 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/ Crab Nebula |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | In this image the IR spectra has been used to the green channel |
| Comment : |
It looks that a lot of IR radiation comes from the central part of the nebula, the green color.
But I think it's mostly because the red and blue spectra is oversaturated.
There is one (arrow) very green star above the nebula,
then it should have more IR brightness compare to the surrounding stars.
My star chart is not detailed enough to identify this star.
According to Thomas Karlsson this is the star HD 244988, a red giant, spectral class M2, from VSX data.
The spectra is not calibrated. |
| More to know : |
Star HD 244988:
http://simbad.u-strasbg.fr/
M1 and HD 244988:
http://www.cosmicvoyage.net/ m1.html |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | In this image the IR spectra has been used to the red, and red to the green channel |
| Comment : |
i.e. the IR, Red, Blue object spectra transform to Red, Green, Blue output channel on the monitor. |
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