en:ost:telescope:handling_new

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en:ost:telescope:handling_new [2021/10/27 20:24] – [Powering up and booting devices] rhainichen:ost:telescope:handling_new [2024/02/22 21:27] (current) – [The All-Sky Monitor] rhainich
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 The All-Sky monitor is already focused and it is usually not necessary to adjust the default setting, so you can click **Start Capture** directly. The camera will start capturing images continuously. The current image is displayed in the **SBIG ALLSky-340 Current Image** window (on the left of the image above), while the **SBIG ALLSky-340 Previous Images** window (on the right of the image above) shows a video from the images already captured. The camera adjusts the exposure time automatically. Especially in darkness, you may have to wait a few exposures until the camera has adjusted the exposure time correctly and you can then see the surroundings and the night sky. The camera is connected to the OMS via a serial connection, which makes the connection stable but also very slow, so that it takes a while until the individual images are downloaded.  The All-Sky monitor is already focused and it is usually not necessary to adjust the default setting, so you can click **Start Capture** directly. The camera will start capturing images continuously. The current image is displayed in the **SBIG ALLSky-340 Current Image** window (on the left of the image above), while the **SBIG ALLSky-340 Previous Images** window (on the right of the image above) shows a video from the images already captured. The camera adjusts the exposure time automatically. Especially in darkness, you may have to wait a few exposures until the camera has adjusted the exposure time correctly and you can then see the surroundings and the night sky. The camera is connected to the OMS via a serial connection, which makes the connection stable but also very slow, so that it takes a while until the individual images are downloaded. 
 +
 +In addition to this well-established all-sky camera, we now have our own construction that is in operation 24 hours a day and provides a [[https://polaris.astro.physik.uni-potsdam.de/allsky/ | Live-View]] that is accessible to all. In addition a [[https://polaris.astro.physik.uni-potsdam.de/allsky/videos/ | Video]], a [[https://polaris.astro.physik.uni-potsdam.de/allsky/keograms/ | keogram]] and a [[https://polaris.astro.physik.uni-potsdam.de/allsky/startrails/ | star trail exposure]] have been made for each night of the last weeks.  
 +
 +<WRAP group>
 +<WRAP third column>
 +[{{ ost:example_image_allsky.jpg | All sky - example image (**Placeholder**)}}] 
 +[{{ ost:startrails_allsky.jpg | All sky - star trails (**Placeholder**)}}]
 +</WRAP>
 +<WRAP third column>
 +[{{ ost:keogram_allsky.jpg | All sky - keogram (**Placeholder**)}}]
 +</WRAP>
 +<WRAP third column>
 +[{{ ost:all-sky_own_design.jpg | In-house designed all sky camera}}]
 +</WRAP>
 +</WRAP>
  
 ==== Focusing & PWI3 ==== ==== Focusing & PWI3 ====
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 === Changing the instruments === === Changing the instruments ===
- 
-When changing the instruments, two basic things have to be considered: On the one hand, the focuser has naturally only a limited adjustment range, so for different instruments also different adapters (M68 thread) are needed. In the article on [[en:ost:fokus_new | focusing]], we go into more detail on how to calculate the ideal adapter length and also list the adapter lengths used for the most commonly used instruments.  
  
 <WRAP group> <WRAP group>
 <WRAP half column> <WRAP half column>
  
-Furthermore, the interchangeable balance weights at the front of the telescope should be adapted to the instrument in question. As shown in the image to the right, balance weights can be attached at two points. The configuration shown is for the STF8300M, while for the BACHES with the ST-8 another balance weight should be added. This balance weight should ideally be attached to the side away from the mount (the right side in the picture). For our QHY600M, one balance weight must be added on each side compared to the configuration in the picture. For observations with the eyepieces, all balance weights should be removed from the front and ideally some should be reattached at the back.+There are two basic things to keep in mind when changing instruments: First, the focuser has a limited range of adjustment, which means that different adapters (M68 thread) are needed for different instruments. In the [[en:ost:fokus_new | focusing]] article, we explain in more detail how to calculate the ideal adapter length and list the adapter lengths normally used for the most common instruments. 
  
-Additional balance weights are located in the large metal cabinet. The balance weights can simply be screwed onto the existing ones. When handling the balance weights, the telescope should be placed in a position where it is facing the ground as much as possible to prevent the balance weights from falling into the tube. +In addition, the interchangeable balancing counterweights on the tube should be matched to the instrument (see table below). Several small 230g counterweights and a large 1kg counterweight are available. The latter is mounted on a rod on which it can be moved as required. The rod holder remains attached to the tube at all times. 
 + 
 +The counterweights are located in the large metal cabinet. The small counterweights are screwed onto a counterweight holder, which usually has to be mounted first. When handling the counterweights at the front of the tube, the telescope should be positioned as close to the ground as possible to prevent the counterweights from falling into the tube when they are screwed on or off. 
  
 </WRAP> </WRAP>
 <WRAP half column> <WRAP half column>
-[{{ ost:cdk20:cdk20_small_counterweights.jpg | CDK20 with counterweights}}]+[{{ ost:cdk20:balacing_weight_eyepiece.jpg | CDK20 with counterweights}}]
 </WRAP> </WRAP>
 </WRAP> </WRAP>
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 |< 100% 20% 45% 15% >| |< 100% 20% 45% 15% >|
-^  Balance weight mount  |  | {{:ost:cdk20:balance_weights_mount.jpg|}} | +^ Counterweight holder                 |                                                | {{ost:cdk20:balance_weights_mount.jpg|}} | 
-^  STF8300M              |  Two balance weights on the inside (side facing the mount) and one balance weight on the outside (side facing away from the mount)  | {{ost:cdk20:balance_weights_sft8300.jpg|}} | +^ Mounting block for counterweight bar |                        |  {{ost:cdk20:mounting_block_counterweight_bar_highlighted.jpg|}} | 
-^  BACHES + ST-8         |  Two balance weights on the inside and the outside  | {{ost:cdk20:balance_weights_baches.jpg|}} | +^ Always mounted        | **A** small balancing counterweight **in front** of the tube | {{ost:cdk20:balacing_weight_front.jpg|}} | 
-^  QHY600M               |  Three balance weights on the inside and two balance weights on the outside  | {{ost:cdk20:balance_weights_qhy600m.jpg|}} |+^ Eyepiece | **1kg** balancing counterweight (square box) and **four** small balancing counterweights (ellipse) **at the rear** of the tube | {{ost:cdk20:balacing_weight_eyepiece.jpg|}} | 
 +^ DADOS & QHY 268M    | **A** small balancing counterweight **at the back** of the tube | {{ost:cdk20:balacing_weight_dados.jpg|}} | 
 +^ BACHES & QHY 268M   | **No** balance weight required                                | {{ost:cdk20:balance_weights_qhy600m.jpg|}} | 
 +^ QHY600M             | **No** balance weight required                                 | {{ost:cdk20:qhy600_mounted_trimmed.jpg|}} | 
 + 
 +/* 
 +^  STF8300M              |  Currently not known                               | {{ost:cdk20:balance_weights_sft8300.jpg|}} | 
 +*/
  
 ==== After the observations ==== ==== After the observations ====
  • en/ost/telescope/handling_new.1635366275.txt.gz
  • Last modified: 2021/10/27 20:24
  • by rhainich