Jupiter with the new
10" f/3.9 Orion Astrograph
and Orion Planetary imaging filter set.
January 16, 2016
are a few first test shot using the Orion Planetary imaging filter
set for your evaluation. This totally new set of three interference
filters includes a UV (Ultra Violet), IR (Infrared), and a CH4
(Methane band) wavelengths, for enhanced imaging of planetary
details unseen in visual wavelengths. At 2am, Jupiter rides high
in the sky and is the perfect target for tests because its cloud
bands show a host of different details with different wavelengths.
I was out this morning shooting Comet Catalina anyway and the
opportunity was perfect. Seeing was real bad - a front moved
in only hours later and completely clouded the sky all the rest
of the weekend! With 2/5 seeing, the details are not too clear,
but I could tell the new 10" was providing sharper images
than the seeing. So here are some results. |
the sharpest view of the night was with the IR filter, not unexpected.
UV is the worst seeing as the atmosphere is less stable in ultra
violet and blues. The methane filter is VERY dark. The camera
can barely see this wavelength too, despite the fact it is a
full spectrum chip CCD with no filter window over the chip. This
deep IR band took over 5 seconds and was very noisy using the
Barlow, so I went back to prime focus and was able to do 1/4
second but still max gain and the second methane shot has been
enlarged to match in size. Finally, an RGB shot of Jupiter using
standard Red, Blue and Green filters is the final frame.
Here is another
comparison, the prime focus - no Barlow using the UV and CH4
filters. This is the actual size on the chip, this is a 100%
size file from the CCD, which is a 1/4" sensor from my DMK31
camera. This camera rips out frames at 30fps and can capture
moments of good seeing better than my larger chip DMK cameras.
Overall, the results
are encouraging! While using UV filtration is best reserved for
the Planet Venus to penetrate the cloud layers, the IR filter
will be great on nights of less than perfect seeing. (all the
time here in Rim Country!) The methane filter is for Jupiter
and Saturn, I think Uranus and Neptune will be way to dim.
Instrument: 10" f/3.9 Orion Astrograph
Platform: Astrophysics AP1200
CCD Camera: Image Source DMK 31 (1024 x 768)
Filter: Custom Scientific RGB, Orion Planetary filter set
Exposure: 1/100 sec to 5s
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing 2/5, Transparency 7/10
Outside Temperature: 25F
300/1000 best frames, alignment in Registax, Wavelets in Registax,
Levels and Contrast Masking In Photoshop CS2,|