Spectro avec C11 ?

Design, construction, tuning of spectroscopes
Information and discussion about softwares (telescope remote, autoguiding, acquisition, spectral processing ...)

Spectro avec C11 ?

Postby etienne bertrand » Wed May 23, 2018 10:09 pm

Pour gagner des photons je réfléchis à passer à un C11 pour l'Alpy et le Lhires avec monture EQ6, qu'en pensez vous ? ça va être trop lourd pour bien marcher ? ou ça passe ? Pour l'instant j'ai un C8, ça marche parfaitement mais il faut poser longtemps, le but est d'avoir un meilleur signal possible avec la configuration voir d'atteindre les étoiles Be à magnitudes 10.
etienne bertrand
 
Posts: 648
Joined: Mon Aug 31, 2015 11:26 am

Re: Spectro avec C11 ?

Postby Ken Harrison » Fri May 25, 2018 5:56 am

Etienne,
The C11 is a popular choice for spectroscopy and fits well on an NEQ6pro mount.
I use the Spectra-L200 plus ATik 314L on my C11 controlled by a Lodestar guider, using EQMod and CdC.
Mainsail Obs 001s.jpg
Mainsail Obs 001s.jpg (64.74 KiB) Viewed 594 times

Mainsail Obs2 009s.jpg
Mainsail Obs2 009s.jpg (61.95 KiB) Viewed 594 times
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
http://www.astronomicalspectroscopy.com
Ken Harrison
 
Posts: 156
Joined: Thu Oct 25, 2012 5:45 am
Location: St Leonards, Australia

Re: Spectro avec C11 ?

Postby Andrew Smith » Fri May 25, 2018 2:39 pm

Etienne, just remember SN scales with diameter so the gain may not be as big as investing in a new camera(s) with a lower read noise, higher QE than your current one?

Just a thought.

Regards Andrew
Andrew Smith
 
Posts: 287
Joined: Fri Sep 30, 2011 12:23 pm

Re: Spectro avec C11 ?

Postby etienne bertrand » Fri May 25, 2018 4:09 pm

Thanks Ken for the photo, i think C11 is a good/best for the EQ6.
Andrew, i use a Atik414EX so it's a good last CCD. The diametre is interesting i think with the same materiel for have a better SNR.
etienne bertrand
 
Posts: 648
Joined: Mon Aug 31, 2015 11:26 am

Re: Spectro avec C11 ?

Postby Francois Teyssier » Thu Jun 07, 2018 6:37 pm

Bonjour Etienne,
Une autre façon d'envisager le probleme : la qualité de l'autoguidage
Diamètre, qualité, réglage et focalisation du telescope = plus de photons
Autoguidage (monture) = plus de photons dans la fente
François
Francois Teyssier
 
Posts: 1152
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Spectro avec C11 ?

Postby Ken Harrison » Thu Jun 07, 2018 10:26 pm

I find the slit guiding capabilities of AstroArt to be very good. PHD2 is always a good fall back.
Ken
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
http://www.astronomicalspectroscopy.com
Ken Harrison
 
Posts: 156
Joined: Thu Oct 25, 2012 5:45 am
Location: St Leonards, Australia

Re: Spectro avec C11 ?

Postby Robin Leadbeater » Thu Jun 07, 2018 10:55 pm

Andrew Smith wrote:Etienne, just remember SN scales with diameter


The improvement can be even less than that for a slit spectrograph depending on seeing and slit width because of the larger star image. When I went from the VC200L to the C11 I had to increase the slit width in the LHIRES from 23um to 35um and lose resolution to get the full advantage of the larger aperture.

For fast low resolution spectrographs like the ALPY or LISA, I think Christian has the right idea. A fast, large aperture Newtonian is ideal. Better than an SCT with a focal reducer which can give give problems with chromatic aberrations. They can be good value too if you avoid those with flat field correctors (which is not needed). They are big though so you need space and a stable mount.

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1036
Joined: Mon Sep 26, 2011 4:41 pm

Re: Spectro avec C11 ?

Postby Andrew Smith » Fri Jun 08, 2018 11:11 am

Robin Leadbeater wrote:For fast low resolution spectrographs like the ALPY or LISA, I think Christian has the right idea. A fast, large aperture Newtonian is ideal. Better than an SCT with a focal reducer which can give give problems with chromatic aberrations. They can be good value too if you avoid those with flat field correctors (which is not needed). They are big though so you need space and a stable mount.

Cheers
Robin


Yes I found my 300mm Newt went well with my LISA. I did try for an 400mm F5 Newt but it was just too big for my observatory. Going to a 400mm ODK was not such an issue for a fiber fed echelle spectrograph but even the I use a 75 micron hole reduced to 50 micron fiber.

Regards Andrew
Andrew Smith
 
Posts: 287
Joined: Fri Sep 30, 2011 12:23 pm


Return to Spectroscopes and Softwares

Who is online

Users browsing this forum: No registered users and 1 guest

x