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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

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Continuum under 450nm with good seeing

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allhoest
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Continuum under 450nm with good seeing

Post by allhoest » Wed Aug 28, 2019 4:07 pm

Here is the last solar image made in St Véran.
The wind came from the south, like the days before.
Generally a southerly wind is a sign of a difficult observing conditions, with unstable seeing.
The best seeing comes with a westerly wind.

It had to be an average imaging session and I used a 450nm filter, considering that it would be more suitable than the near UV under 400nm.
To my astonishment, the seeing was excellent.
Checking deeper the local weather conditions, on the south-east side, the ceiling of clouds was low and the valleys covered with clouds ...

Image





Under 450nm, there is no band, no atomic absorption line; imaging is considered to be in "Solar continuum".
I have seen this wavelength range used by solar telescopes for this purpose.
I guess to be low in wavelength so to have contrast, but still in continuum.

As the seeing was good, I pushed the powermate to its limit to increase the magnification.
The equivalent focal length calculated with Iris is about 10.9m.


Image





I gave a try on the limb also.


Image





Alex
2019-Aug-24
Solar Netwon T300
F1800 F/D6
Powermate x5
Edmund Optics 450nm, ~10nm FWHM
ASI174
Gain 0
Exp 300µs
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Re: Continuum under 450nm with good seeing

Post by bart1805 » Wed Aug 28, 2019 4:20 pm

Congratulations Alex, you kept the best for the last day! Truly great images!


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Re: Continuum under 450nm with good seeing

Post by MAURITS » Wed Aug 28, 2019 4:33 pm

What a nice set of images Alex.
Regards,
Maurits

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Re: Continuum under 450nm with good seeing

Post by Carbon60 » Wed Aug 28, 2019 6:48 pm

Superb. Really excellent images, Alex. What a beautiful place to observe from.

Stu.
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Re: Continuum under 450nm with good seeing

Post by eroel » Wed Aug 28, 2019 6:51 pm

Alex:
Superb shots.
Could not get better.
Best regards,
Eric.

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Re: Continuum under 450nm with good seeing

Post by ffellah » Wed Aug 28, 2019 7:40 pm

That granulation image is outstanding ! Love the view from the mountain.

Well done, Alex, difficult to beat...

Franco

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Re: Continuum under 450nm with good seeing

Post by xn44 » Thu Aug 29, 2019 6:39 am

Awesome images!

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Re: Continuum under 450nm with good seeing

Post by LauraMS » Thu Aug 29, 2019 8:32 am

Superb images, Alex!

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Re: Continuum under 450nm with good seeing

Post by Montana » Thu Aug 29, 2019 8:59 am

Oh my goodness :movie a star is born :hamster:

:bow :bow :bow
Alexandra

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Re: Continuum under 450nm with good seeing

Post by robert » Thu Aug 29, 2019 10:50 am

Wonderful!
Robert
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Re: Continuum under 450nm with good seeing

Post by marktownley » Thu Aug 29, 2019 12:14 pm

Incredible images Alex!
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Re: Continuum under 450nm with good seeing

Post by allhoest » Thu Aug 29, 2019 7:19 pm

Thank you for the nice comments.
Despite being made out of nuts and bold, I'm happy with this T300.

CS
Alex.

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Re: Continuum under 450nm with good seeing

Post by Astrophil » Thu Aug 29, 2019 9:38 pm

Exceptional images, Alex!
Thanks.
Phil

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Re: Continuum under 450nm with good seeing

Post by mattwastell » Tue Dec 03, 2019 9:19 am

The mountainous rage look pretty good - the solar pics are stupendously good - thanks for the candy!!!!!!
Matt Wastell



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