IR 100 MURNAGHAN

The IR100 is a longpass filter that transmits the extreme end of the CCD sensitivity. It allows some specials applications under very difficult conditions. Note : the transmission after 900 nm is only estimated.

- Extremely weak quantity of light (except on Venus) requiring solid imaging technic and the use of cameras able to make exposures of a few seconds.
- Important loss of resolution

Mars 17 october 2005 - Mewlon 210 and Lumenera LU075M The filter probably doesn't show different things from the usualy IR-pass filters, but could provide interesting atmospheric penetration in the case of big dust storms. This was seen on HST images in 2001 at 1042 nm.
Saturn 8 december 2004 - Mewlon 210 and ATK-1HS The globe is darker than rings. There must be an absorption, probably by a CH4 band near 1 micron.
Jupiter 3rd october 2011 - Gregory 250 and PLA-Mx The presence of CH4 absorption is proven by the bright appearance of all the higher clouds (the GRS, the SEB outbreak, the south polar haze). The interest of the image looks weak at best, though. The planet has almost the same aspect it has with a classical IR filter (700 nm...), but with markedly reduced resolution. On the other hand, the CH4 absorption is marginal and then not helpfull.
Venus (dayside) Enhances some very weak details (hard to see here), but the Astronomik IR807 would do much better here.
Venus (nightside) This is maybe the most interesting use. The filter is able to detectal the thermal emission from the ground of the planet. More information