TAG Gemini
Re: Gemini
Art Morton wrote: > http://www.lazyfocus.com/docs/GSI/GSI_Manual.htm I bought one of these from James L. last year. He doesn’t actively sell them, so I had to wait a bit for him to get around […]
PAC: from the horse's mouth
A, The guy who wrote Gemini (Rene Goerlich) had this to say about Polar Axis Correction, etc. 4 things of interest to note: 1) before 1st PAC, do a minimal pointing model […]
General / Maintenance / Techniques
pointing model building
When I build a pointing model using PAC on the Gemini, I get this strange behavior, where the error numbers are very large and then get smaller and smaller to some fairly […]
fancy book learnin'
A, an excerpt from http://www.russellstreetobservatory.co.uk/equipment/G11pt4.html, a guy whose demand is 5 minutes unguided at 1000mm. I don’t think he’s going to get it, but he took great notes about his learning curve […]
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Re: Pointing Model vs. Polar Alignment
Art Morton wrote: >> I have no earthly idea how to get the Gemini to go at 2x sidereal. >> Without getting the drive to turn off in one direction, the alignment […]
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Re: Gemini slew speeds
Hi James, Jamesbielaga@aol.com wrote: > I believe the slew speeds are .3x .5x 2x, 4x 8x and 16x. Manual page > 4 and 5 cover it. I think this is correct for […]
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Re: Pointing Model vs. Polar Alignment
On Jun 9, 2008, at 9:13 AM, Jimbo S. Harris wrote: > Art Morton wrote: >>>> How much of the Veil were you able to cram into one shot? I would >>>> […]
Gemini slew speeds
To do a CCD Polar Alignment, you need to run the mount east at 1x sidereal (the motor runs “backwards” at 1x sidereal), then run the mount west at 1x sidereal (the […]
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Gemini Drift – Pointing Model vs. Polar Alignment
When I am building a Pointing Model in the Gemini (where you select and center bright stars and then the Gemini figures out hot to GOTO properly), the “residual error” which is […]
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Gemini slew speeds
I am trying to get my Gemini handpaddle to slew at exactly 2x sidereal. That is, when I press the “east” button, the drive should move at 2x (stars drift east at […]
RECENT UPDATE
Polar Alignment Calculations
Here’s a page that derives Polar Alignment Calculations. (update 5/2020: the original site is gone, so I found the text on Wayback and am inserting it below. This is by the original […]
Gear / Observatory / Telescope
Special Guest Star takes the mount at Hilltop O
The Astro Jedi needed somewhere to store his light sab—- I mean, bucket, and I was only too happy to accommodate him. I have decided that I need to come to a […]
General / Maintenance / Observatory
Dome shutter is motorized again!
I finally decided to bite the bullet and fix the shutter motor. Things went sideways last winter, and I’ve been opening the shutter manually (and tying it shut with rope, so we […]
Trixie 2017 – tube mods
I finally got around to cutting the MTA-UTA tubes to length; the only eyepiece that would come to focus with the focuser spacer in place is the Televue 55mm Plossl. If I […]
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Deep Sky / Long Exposure Photography
Another beautiful night.