AR 2786 on Nov 27 with the TOA 150 and double stack

this is the main message area for anything solar :)
Post Reply
christian viladrich
Almost There...
Almost There...
Posts: 724
Joined: Sun Jun 14, 2015 4:46 pm
Location: France
Been thanked: 143 times
Contact:

AR 2786 on Nov 27 with the TOA 150 and double stack

Post by christian viladrich » Tue Dec 01, 2020 11:12 am

Hi,

Here are some images of this beautifull group visible on November 27.

These first two images were taken with a double stack combination (DayStar PE 0.6 A and Coronado SMN35 0.5 A) :

Image

Image

This one is taken with the Solar Spectrum 0.3 A. It shows the difference with the double stack combination. Lower layers are sampled in the chromosphere, more spots are visible :
Image

Best regards
Christian


Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/

User avatar
ffellah
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 4282
Joined: Mon Oct 27, 2014 6:46 pm
Location: Westport, CT USA
Has thanked: 896 times
Been thanked: 479 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by ffellah » Tue Dec 01, 2020 11:32 am

Beautiful images and very nice comparison, Christian.

Franco



User avatar
Montana
Librarian
Librarian
Posts: 24339
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 2910 times
Been thanked: 1102 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by Montana » Tue Dec 01, 2020 12:11 pm

A superb comparison!! I would say the penumbra is most pronounced in the Solarspectrum image compared to the DS version. Wonderful images in both versions though :bow :bow :bow

Alexandra




User avatar
DeepSolar64
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3672
Joined: Thu Sep 05, 2019 12:19 am
Location: Edneyville North Carolina U.S.A.
Has thanked: 1724 times
Been thanked: 1733 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by DeepSolar64 » Tue Dec 01, 2020 3:13 pm

I don’t recall that particular Coronado filter. It’s pre-Meade, right?


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Traq 60mm with Baader AstroSolar film
Lunt, Coronado, TeleVue, Orion, Celestron and Sears eyepieces

Image Visual Observer
" Way more fun to see it! "

User avatar
rsfoto
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3266
Joined: Mon Jun 18, 2012 8:30 pm
Location: San Luis Potosi, México
Has thanked: 1935 times
Been thanked: 1419 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by rsfoto » Tue Dec 01, 2020 5:17 pm

Hi,

WOW, impressive details


regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1417
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 300 times
Been thanked: 259 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by MalVeauX » Tue Dec 01, 2020 5:43 pm

Super contrasty Christian!

Very best,



User avatar
marktownley
Librarian
Librarian
Posts: 29828
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 2914 times
Been thanked: 1179 times
Contact:

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by marktownley » Tue Dec 01, 2020 6:15 pm

Excellent images Christian. The difference between single and double stack is both subtle and dramatic at the same time. How do you find it affects exposure time between the two methods?


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

christian viladrich
Almost There...
Almost There...
Posts: 724
Joined: Sun Jun 14, 2015 4:46 pm
Location: France
Been thanked: 143 times
Contact:

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by christian viladrich » Tue Dec 01, 2020 7:34 pm

Thanks to all !

The Coronado SMN35 was made in 2001. This was the time when David Lunt experimented various etalon configurations before converging to the front side air-spaced etalon we know now. This is a fused-silica etalon, themo-regulated and 0.5 A FWHM. Transmission is very high, which is of benefit for double stacking. It comes with a 2 A BF. I have to make a web page with some pictures of it one of these days.

Mark, the exposure time is about double with the double stack compared to the Solar Spectrum (if I used the same gain).


Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/

christian viladrich
Almost There...
Almost There...
Posts: 724
Joined: Sun Jun 14, 2015 4:46 pm
Location: France
Been thanked: 143 times
Contact:

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by christian viladrich » Tue Dec 01, 2020 8:04 pm

Alexandra; I would say that the penumbra tends to vanish with the double stack. Probably because it is partly covered by the Ha canopy.

With the SS 0.3 A, there is a sort of brightening arround the penumbra of small spot on the right, which is not the case with the double stack.


Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/

Astrophil
Almost There...
Almost There...
Posts: 701
Joined: Thu Dec 20, 2018 2:00 am
Been thanked: 261 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by Astrophil » Tue Dec 01, 2020 11:14 pm

Christian, those are exceptionally good images and the ss/ds comparison shows the difference nicely. I'm not sure which version I like the best.

Phil



User avatar
eroel
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 6540
Joined: Mon Dec 19, 2011 10:45 pm
Location: México D.F.
Been thanked: 1132 times

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by eroel » Tue Dec 01, 2020 11:18 pm

Christian:
Super images.
Best regards.
Eric.



User avatar
jp-brahic
Almost There...
Almost There...
Posts: 987
Joined: Mon Apr 14, 2014 5:08 pm
Location: uzès ( France)
Been thanked: 11 times
Contact:

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by jp-brahic » Wed Dec 02, 2020 7:31 am

Nice shots Christian :)

JP


Réfractor Spécial H-Alpha (Istar optical ) 230mm F/D 9
Solar Télescope Cassegrain CFF 350mm F/D 20 Clearceram + ERF-D Tri Band 312mm ARIES Instruments.
TN 450mm F/D 4 Zerodur

Web Site : http://jp-brahic.chez-alice.fr/

Astrobin : https://www.astrobin.com/users/jp-brahic/

User avatar
MAURITS
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1754
Joined: Tue Nov 27, 2018 4:37 pm
Location: Belgium
Has thanked: 19 times
Been thanked: 80 times
Contact:

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Post by MAURITS » Wed Dec 02, 2020 9:10 am

Top Christian.


Regards,
Maurits

Vista del Cielo Observatory

www.vistadelcielo.be

Post Reply