ALPY/Lisa: 460Ex+414ex?

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James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

Re: ALPY/Lisa: 460Ex+414ex?

Post by James Foster »

I have two Titans, One for the Alpy600 and one for the LISA in IR-mode. From Mt. Pinos, CA (Bortle 3-4 sky)
I can see targets down to 15.5 magV with my 33cm aperture classical cassegrain with a 6 sec exposure.
Its amazing that Robin can get down to 20th magnitude with a C-11 at F/5.5, even if there stacked.
I'll try for an ultra dim target (mag<17) with my LISA on a high red shift BH!

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Re: ALPY/Lisa: 460Ex+414ex?

Post by Robin Leadbeater »

James Foster wrote: Its amazing that Robin can get down to 20th magnitude with a C-11 at F/5.5, even if there stacked.
I can't guide on that though. The target is invisible while guiding. I take a deep stacked image using the guiding camera and measure the offset to a brighter star that I then guide on.

This is the 30x30sec stack I used to calculate the guiding offset for PS1_J134743+495621 (The total exposure for the spectrum was 140 minutes)
PS1_J134743+495621_guider_30s_stacked_neg_annot.jpg
PS1_J134743+495621_guider_30s_stacked_neg_annot.jpg (62.55 KiB) Viewed 1492 times
Good luck with your faint targets !

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Re: ALPY/Lisa: 460Ex+414ex?

Post by Robin Leadbeater »

Robin Leadbeater wrote:I take a deep stacked image using the guiding camera and measure the offset to a brighter star that I then guide on.
I think I used the "bright" ~mag14 star at the top of the image to guide on

Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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