Use of registax and limovie for the reduction of marginal occultations
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Use of Registax and LiMovie for the Reduction of Marginal Occultations. Tony George Umatilla, Oregon. Low light video cameras such as the Supercircuits PC164C and Watec WAT 902H series cameras allow observers to record occultations at the very limit of detectability.

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Use of registax and limovie for the reduction of marginal occultations

Use of Registax and LiMovie for the Reduction of Marginal Occultations

Tony George

Umatilla, Oregon


Low light video cameras such as the Supercircuits PC164C Occultationsand Watec WAT 902H series camerasallow observers to recordoccultations at the very limit of detectability


The problem comes when we try to reduce the data from these very low brightness events, sometimes the target star is not visible on the video monitor and sometimes in LiMovie we cannot see the target star to affix an aperture to measure the brightness


To avoid this problem some observers use integrating cameras such as

WAT 120N and Astrovid Stellacam very low brightness events, sometimes the target star is not visible on the video monitor and sometimes in LiMovie we cannot see the target star to affix an aperture to measure the brightness

Lumenera SKYnyx2-0

SBIG STV

To avoid this problem, some observers use integrating cameras such as:


These are great cameras but there are a couple of problems
These are great cameras but there are a couple of problems very low brightness events, sometimes the target star is not visible on the video monitor and sometimes in LiMovie we cannot see the target star to affix an aperture to measure the brightness

  • At the maximum frame rate, they may not be as sensitive as the non-integrating cameras

  • If you select an integration rate that is too long, you lose time resolution in your data


One solution to this problem is to use the non-integrating CCD video camera and then integrate the video after recording. This allows you to extract just enough of the signal to detect the event (or confirm a negative event), but no more than is necessary to avoid unnecessary loss of time resolution


So how do you do this registax to the rescue
So how do you do this? CCD video camera and then integrate the video after recording. This allows you to extract just enough of the signal to detect the event (or confirm a negative event), but no more than is necessary to avoid unnecessary loss of time resolutionRegistax to the rescue…


Videos can be easily and quickly integrated with Registax without any loss of video integrity and only the minimum required for time resolution


Integration can be done in four simple steps
Integration can be done in four simple steps without any loss of video integrity and only the minimum required for time resolution


We can take limovie data that looks like this
We can take LiMovie data that looks like this…. without any loss of video integrity and only the minimum required for time resolution

Is there an occultation in this raw data?


And turn it into data that looks like this

And turn it into data that looks like this without any loss of video integrity and only the minimum required for time resolution

This was done with a 5-frame integration from raw data

This was done with an 11-frame integration from raw data



If there is a bright star in the field a pre registration can be done in six simple steps
If there is a bright star in the field, a pre-registration can be done in six simple steps

Do not ‘Optimize’

Press Save to create a ‘Registered’ file


Here is a raw shaky image
Here is a raw shaky image… can be done in six simple steps


LiMovie cannot reliably track the faint star in the raw data…it is hard to tell what is happening to the faint star



In the ‘registered’ file, LiMovie tracks the faint star, even right next to the bright star – and we have data on both stars. If the faint star was the one occulted, we would now have good data.


Detailed procedures for using Registax for preprocessing videos for subsequent analysis by LiMovie are contained here:http://www.asteroidoccultation.com/observations/Forms/RegistaxAlignment.htm


LiMovie, coupled with Registax can prove to be a very powerful combination – one that can greatly extend the events we can detect and report


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