Hello ,
I was really blessed today as I think I might have caught the best prom in 25 years of observation with the wide slit spectrocopic method ...
here are the results..
Here are with 1800 and 2400 lines to show the difference with 600 lines/mm
prom of June 7th ,2023 : one of my best with spectro coro
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prom of June 7th ,2023 : one of my best with spectro coro
spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: prom of June 7th ,2023 : one of my best with spectro coro
1800 lines /mm
and with the 2400 lines /mm
Chris
The 600 lines/mm gives the best images with the WIDE SLIT spectroscope because then the image isnt deformed by the Doppler effect and the dispersion where a "point" if the image on the entrance slit doesnt become a line in the spectrum because the dispersion enlarges it .
IMPORTANT : Dont forget that the configuration of the spectroscope plays a very important role in the image geometry : the "classic" config shrinks the image due to anamorphosis. That's why I prefered to now use the Littrow congig where the "shrinking" is minimised.
and with the 2400 lines /mm
Chris
The 600 lines/mm gives the best images with the WIDE SLIT spectroscope because then the image isnt deformed by the Doppler effect and the dispersion where a "point" if the image on the entrance slit doesnt become a line in the spectrum because the dispersion enlarges it .
IMPORTANT : Dont forget that the configuration of the spectroscope plays a very important role in the image geometry : the "classic" config shrinks the image due to anamorphosis. That's why I prefered to now use the Littrow congig where the "shrinking" is minimised.
spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: prom of June 7th ,2023 : one of my best with spectro coro
That is a monster!! and amazing clarity and detail too
Alexandra
Alexandra
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Re: prom of June 7th ,2023 : one of my best with spectro coro
Fantastic detail Chris. Could a flat frame be used so as to remove the artifacts from the grating/slit?
Alun
Alun
Lunt 50THa solar scope
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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Re: prom of June 7th ,2023 : one of my best with spectro coro
Hi,
Excellent work
Excellent work
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°