Differential Flexure solved, new CLS filter and new calibration library

This month was very full of news. First of all we finally solved the differential flexure issue: during the last observations we noticed a slight drift on the images even if in the autoguider the error was in the arcsec range. The differential flexure occurs when the autoguider is not fixed well to the telescope. This can let the autoguider to move differently wrt the telescope causing a slight drift on images. Few days ago we finally solved this issue by installing another support ring which fastens the autoguider firmly to the telescope. Finally we can achieve the arcsec theoretical resolution and improve our tracking system even for orbital imaging sessions.

The autoguider stability upgrade

We also bought a new CLS filter from OPTOLONG to replace our Orion SkyGlow. We will provide a head to head review of these filter here as soon as possible. The new filter has a slightly different cutting spectrum which should preserve better the colors while still blocking the light pollution. Starting from tonight we will test this new filter.

The new CLS filter

During the last observations, we noticed that the sensor was working at a higher temperature (10°C higher) due to the warm weather that is occurring these days in Italy. We had to build a new dark library to keep the dark current below the limits during the processing, therefore we built again the entire calibration library (dark, flat and bias). While I’m writing, Sandro is processing the new NGC9646 photo with the new calibration data. Last week I elaborated this target data in an astrometric enhanced way to do astrometric and photometric analysis on the recent supernova but now with the new darks and flats, Sandro will be able to provide an astropotographic release of this target with all the colors processed.

During the past two days Sandro was also trying to keep the EOS colder in a new way. We already tried to build a cold box with a peltier and we tried to apply directly the peltier to the camera back but we didn’t obtain noticeable effects. During last week Sandro found a new way to try to keep the camera some degree below the current temperature without open the camera by applying a fan on the back of the camera and taking advantage of the forced convective thermal exchange. The results were poor, so we are still looking for a way to keep the camera (some degrees) colder without expose its sensor. If you have any idea (not only on this) you can leave a comment or send us an email.

More news to come in the next articles!

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