en:ost:telescope:handling_new

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en:ost:telescope:handling_new [2021/10/27 21:04] – [Changing the instruments] rhainichen:ost:telescope:handling_new [2025/04/30 20:09] (current) – [Log in] rhainich
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     * as needed, open the horizontal hatch     * as needed, open the horizontal hatch
  
-=== The Mount: GM4000 QCI ====+=== The Mount: GM4000 HPS II ====
  
 A description of the hand terminal, including some aspects of the operating system are described in a separated [[:en:ost:telescope:hand_terminal|article]].  A description of the hand terminal, including some aspects of the operating system are described in a separated [[:en:ost:telescope:hand_terminal|article]]. 
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 ==== Log in ==== ==== Log in ====
  
-The OMS is accessible by means of the Remote Desktop Protocol (RDP). However, the login is restricted to the local IP address space. Thus, one first has to login to one of the Linux machines from the astro physics department preferentially via ssh. For the lab course, one can use the laboratory computer a12. A [[:en:praktikum:zugang|how-to]] explaining the ssh login is available. +The OMS is accessed using the Remote Desktop Protocol (RDP). However, login is restricted to the local IP address space. Therefore, you must first log in to one of the Linux machines of the astrophysics groups or establish an SSH tunnel to these machines. The columba evaluation computer can be used for the lab course. A [[[:en:praktikum:zugang|how-to]] explaining the SSH login is available.
  
-To use RDP from a Linux computer, we recommend ''Remmina'', which is available on all our Linux Installations. An example configuration for ''Remmina'' is describe in this [[:en:ost:telescope:remmina|article]]. +To use RDP from a Linux machine, we recommend ''Remmina'', which is available on all our Linux installations. A sample configuration for ''Remmina'' is described in this [[:en:ost:telescope:remmina|article]]. This article also explains how to login from a Windows machine.
  
  
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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 exchangeable balance weights at the back or front of the tube should be adapted to the respective instrument. The arrangement shown on the right image is for a telescope configuration that is currently no longer in use. For the current configuration, significantly fewer balance weights are needed (see table below). Only for observations with the eyepieces all balance weights have to be attached to the back of the tube. +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 at the front of the tube, 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 two 1kg counterweights are available. The latter are mounted on a rod on which they 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_dados.jpg | CDK20 with DADOS and counterweight}}]
 </WRAP> </WRAP>
 </WRAP> </WRAP>
  
 **Configurations:** **Configurations:**
- 
-Todo: Update images in the table. 
  
 |< 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|}} | 
-^  Eyepieces             |  **All** balance weights at the back of the tube   | {{ost:cdk20:balance_weights_sft8300.jpg|}} | +^ Mounting block for counterweight bar |                        |  {{ost:cdk20:mounting_block_counterweight_bar_highlighted.jpg|}} | 
-^  BACHES/DADOS + ST-8   |  **One** balance weights at the front of the tube  | {{ost:cdk20:balance_weights_baches.jpg|}} | +^ Always mounted        | **A** small balancing counterweight **in front** of the tube | {{ost:cdk20:balacing_weight_front.jpg|}} | 
-^  QHY600M               |  **No** balance weights needed                     | {{ost:cdk20:balance_weights_qhy600m.jpg|}} |+^ Eyepiece | At the **rear** of the tube: **two 1kg counterweights** (green rectangle). The defined position of the two 1kg weights on the buoyancy compensator rod is marked. At the **front** of the tube: **Two small weights** (not shown), i.e. one in addition to the standard weight. | {{ost:cdk20:balancing_weights_eyepieces_2024_small.jpg|}} | 
 +^ DADOS & QHY 268M    | **A** small balancing counterweight **at the back** of the tube | {{ost:cdk20:balacing_weight_dados.jpg|}} | 
 +^ BACHES & QHY 268M   | **No** additional balance weight required                                | {{ost:cdk20:balance_weights_qhy600m.jpg|}} | 
 +^ QHY600M             | **No** additional balance weight required                                 | {{ost:cdk20:qhy600_mounted_trimmed.jpg|}} | 
 + 
 +/*
 ^  STF8300M              |  Currently not known                               | {{ost:cdk20:balance_weights_sft8300.jpg|}} | ^  STF8300M              |  Currently not known                               | {{ost:cdk20:balance_weights_sft8300.jpg|}} |
 +*/
  
 ==== After the observations ==== ==== After the observations ====
  • en/ost/telescope/handling_new.1635368647.txt.gz
  • Last modified: 2021/10/27 21:04
  • by rhainich