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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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Full Disc 15 January 2020

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rsfoto
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Full Disc 15 January 2020

Post by rsfoto » Wed Jan 15, 2020 10:24 pm

Hi,

High and thin clouds infront of the Sun but enough light so I thought to give it a try it and below the result. Sorry for the bad quality :oops:

If yout ake a look at the SDO magnetogram image you can see in the northern hemisphere a cycle 24 and a cycle 25 spot. The most left one is cycle 25 :shock:

Mosaico_20200115_9Q_RE.jpg
Mosaico_20200115_9Q_RE.jpg (1.07 MiB) Viewed 136 times

and below is how the Sun looked through the clouds.

Sun_Clouds_20200115.jpg
Sun_Clouds_20200115.jpg (253.23 KiB) Viewed 136 times
regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

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eroel
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Re: Full Disc 15 January 2020

Post by eroel » Wed Jan 15, 2020 10:42 pm

Rainer:
Nice result in spite of conditions, at home I had about the same problem (thin high clouds).
Fuerte abrazo,
Eric.

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Re: Full Disc 15 January 2020

Post by ffellah » Thu Jan 16, 2020 1:14 am

Hi Rainer: very nice results in spite of the thin clouds. Are you still using the Daystar filter? If you are, which one ?

Franco :bow

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Re: Full Disc 15 January 2020

Post by JochenM » Thu Jan 16, 2020 5:43 am

Good job managing to get that image (I think it's still good) in those type of conditions.

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Re: Full Disc 15 January 2020

Post by marktownley » Thu Jan 16, 2020 5:48 am

Excellent image, especially given those hazy skies, i'm hoping the weather allows me to get the solar scope out this weekend at some point.
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Re: Full Disc 15 January 2020

Post by Montana » Thu Jan 16, 2020 12:07 pm

Franco, somehow I don't think a full disc that superb came from a Daystar filter (sorry, am I allowed to say that?).

Rainer, another wonderful disc, you are very lucky to have that filter set :bow
Alexandra

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Re: Full Disc 15 January 2020

Post by rsfoto » Thu Jan 16, 2020 3:49 pm

ffellah wrote:
Thu Jan 16, 2020 1:14 am
Hi Rainer: very nice results in spite of the thin clouds. Are you still using the Daystar filter? If you are, which one ?

Franco :bow
Hi Franco,

Sorry no. Both DayStar filters I bought in April 2018 has gone back to DayStar as both were blind. Everytime I read the word DayStar I get angry :lol:

That purchase was a total failure and even worse the way DayStar handled the complain. Weeks and weeks with no answers ...

DayStar is dead for me for all times ...

I have now only a very double stacked Coronado SM 60 with BF 30 ...

Rainer
regards Rainer

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Re: Full Disc 15 January 2020

Post by ffellah » Thu Jan 16, 2020 7:06 pm

Rainer: you are a magician ! You certainly are doing a magnificent job of full disks with the SM 60 double stacked. I wish I could do the same with my SM90 DS. The 90 is traditionally not easy to put in band due to the length of the scope: you need orangutan arms to tune the external etalon while you look into the eyepiece. Once it is band, though, the results are excellent.

Franco

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Re: Full Disc 15 January 2020

Post by rsfoto » Thu Jan 16, 2020 7:32 pm

ffellah wrote:
Thu Jan 16, 2020 7:06 pm
Rainer: you are a magician ! You certainly are doing a magnificent job of full disks with the SM 60 double stacked. I wish I could do the same with my SM90 DS. The 90 is traditionally not easy to put in band due to the length of the scope: you need orangutan arms to tune the external etalon while you look into the eyepiece. Once it is band, though, the results are excellent.

Franco
Hi Franco,

I am no magician. I have the advantage of being able to adjust very fine the etalons remotely while looking on my monitor. I made that 7 seven years ago.

Look here viewtopic.php?f=9&t=26907&p=243127&hili ... er#p243127


Below the drawings of the parts you need to machine. OK, then you need a 10mm stepper motor with high reduction gears, a bellow couples, a screw which changes the angle, and a stepper motor driver and a little piece of software to move the stepper motor step by step ...

CORO_1.JPG
CORO_1.JPG (118.54 KiB) Viewed 77 times

Rainer
regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

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Re: Full Disc 15 January 2020

Post by salvo lauricella » Sat Jan 18, 2020 11:31 am

Excellent image!

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Re: Full Disc 15 January 2020

Post by MapleRidge » Sat Jan 18, 2020 1:28 pm

Hi Rainer...

You have certainly mastered the full disk mosaics with that scope. Superb image despite the cloud :bow

Brian
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