https://polaris.astro.physik.uni-potsdam.de/wiki/ Wed, 08 Apr 2026 09:47:03 +0000 FeedCreator 1.8 https://polaris.astro.physik.uni-potsdam.de/wiki/lib/exe/fetch.php?media=wiki:logo.png https://polaris.astro.physik.uni-potsdam.de/wiki/ https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:bedienung&rev=1616001507&do=diff This page is outdated and not longer valid. It will be removed soon. OST operation -- Security remarks * NEVER look at the Sun with a telescope without a proper sun filter. This can lead to irreparable damage of your eyes and the optical instruments! The OST is not designed for observations of the Sun, so never point it to the Sun! anonymous@undisclosed.example.com (Anonymous) Wed, 17 Mar 2021 17:18:27 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:c8_bedienung&rev=1708422082&do=diff Celestron Advanced GT The Celestron Advanced GT mount is our entry-level mount, primarily used with the C8 and OSST (Coronado Hα Solar Telescope). With a payload capacity of up to 12kg, it can also carry a number of other telescopes and cameras. However, it is only equipped with a mount for the Vixen prism rails. In terms of type, it is a computer-controlled equatorial system suitable for both visual observations and astrophotography. Thanks to its compact design, it can be easily set up by a … anonymous@undisclosed.example.com (Anonymous) Tue, 20 Feb 2024 09:41:22 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:c11_bedienung&rev=1708420025&do=diff CGE PRO Celestron's CGE PRO is a rugged, computer-controlled German equatorial mount suitable for both astrophotography and visual observation. With a generous payload capacity of up to 41kg, it can effectively accommodate large telescopes and heavy imaging equipment. The precision gears and motors allow for accurate tracking and alignment, although our model is getting older and no longer achieves such high precision. With autoguiding support, however, this is not noticeable. In addition, fea… anonymous@undisclosed.example.com (Anonymous) Tue, 20 Feb 2024 09:07:05 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:eq8&rev=1712908120&do=diff EQ8-R PRO Here you will find our illustrated manual for the setup and operation of the EQ8-R PRO from Sky-Watcher. The EQ-8 is a rugged computerized German equatorial mount. The big advantage is the internal cable routing with hub for USB and power supply. anonymous@undisclosed.example.com (Anonymous) Fri, 12 Apr 2024 07:48:40 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:grunddaten&rev=1738739247&do=diff OST - Basics CDK20 - Tube Type Corrected Dall-Kirkham (CDK) Diameter 508 mm Central obstruction 198 mm Focal length 3454 mm Focal ratio f/6.8 Spacial resolution 0.3'' $\pm$ anonymous@undisclosed.example.com (Anonymous) Wed, 05 Feb 2025 07:07:27 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:hand_terminal&rev=1720683691&do=diff GM4000 HPS II: Hand terminal and operation system The Hand terminal The most important function of the hand terminal is to move the telescope with the direction buttons N - S - E - W The N-S-buttons change the telescope's declination and the E-W-buttons change the right ascension. The speed of these changes can be altered by the buttons anonymous@undisclosed.example.com (Anonymous) Thu, 11 Jul 2024 07:41:31 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:handling_new&rev=1774879691&do=diff OST 2.0 operation -- Security remarks * NEVER look at the Sun with a telescope without a proper sun filter. This can lead to irreparable damage of your eyes and the optical instruments! The OST is not designed for observations of the Sun, so never point it to the Sun! anonymous@undisclosed.example.com (Anonymous) Mon, 30 Mar 2026 14:08:11 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:heliostar76&rev=1775047148&do=diff Sky-Watcher Heliostar 76 Hα Overview The Sky-Watcher Heliostar 76 Hα is a dedicated solar telescope designed exclusively for observing the Sun in the hydrogen-alpha (Hα) band at a wavelength of 656.28 nm. Unlike white-light filters, which show only the photosphere, an Hα telescope reveals the chromosphere — the outer layer of the Sun's atmosphere. This makes visible details that remain invisible through a standard solar filter: prominences, filaments, flares, and spicules. anonymous@undisclosed.example.com (Anonymous) Wed, 01 Apr 2026 12:39:08 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:kuppel&rev=1715205005&do=diff The Dome Access to roof and dome Important * The door to the roof can only be opened with the appropriate key. * The door has to be closed when the telescope is switched on, because the hatch of the dome could collide with it as the dome rotates. anonymous@undisclosed.example.com (Anonymous) Wed, 08 May 2024 21:50:05 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:logbuch&rev=1476967224&do=diff OST Logbook Here are all observations, maintenance work or other work on or in the dome documented. Add entry 2026 March Date Start End Who? What has been done? ... ... ... ... Add entry 28.03.2026 00:15 01:10 Rainer Photometry: Caldwell 3 (Halpha) anonymous@undisclosed.example.com (Anonymous) Thu, 20 Oct 2016 12:40:24 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:mobile&rev=1775110896&do=diff Our mobile telescopes Besides our fixed main telescope, the CDK20 from Planewave, our telescope family currently includes the following telescopes: Telescope Potential use cases C14 Deep sky & planets C11 Deep sky, planets & white-light solar observations with a solar filter anonymous@undisclosed.example.com (Anonymous) Thu, 02 Apr 2026 06:21:36 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:probleme&rev=1768488661&do=diff Known problems, issues, and their solution GM4000 HPS II Loss of the alignment Description of the problem: The current alignment has been lost, e.g. by an incorrect operation (delete Alignment). Solution: Restore a previously saved alignment. If such an alignment exists, it can be selected with: anonymous@undisclosed.example.com (Anonymous) Thu, 15 Jan 2026 14:51:01 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:remmina&rev=1746042696&do=diff Remote access to the observatory Remote Desktop Protocol (RDP) In this section we explain how to access our observatory remotely using the Remote Desktop Protocol (RDP). Linux: For Linux users we recommend Remmina, which to our knowledge is available in the repositories of all major distributions. Nevertheless, the following configuration is in principle transferable to any other RDP client. anonymous@undisclosed.example.com (Anonymous) Wed, 30 Apr 2025 19:51:36 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:setup&rev=1720683903&do=diff Telescope setup and maintenance Setup of the GM4000 HPS II mount Using the mount directly via the handheld terminal Alignment The accuracy of the tracking can be improved with a good alignment. This procedure can gather information on possible errors in the azimuth and pole-height settings (correction suggestions for the hardware), to reduce errors in the alignment of the pole axis. anonymous@undisclosed.example.com (Anonymous) Thu, 11 Jul 2024 07:45:03 +0000 https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:ts-apo&rev=1720434731&do=diff 130mm Apochromat from Telescope-Service This page is still under construction... 8-) This page is about our TS-Optics-PHOTOLINE Apochromat. It has an aperture of 130mm and a focal length of 910mm. Consequently, the focal ratio is f/7 but can be reduced to f/5.2 with a reducer. It is equipped with a triplet air-spaced objective lens featuring an SFPL-53-ED glass element from Japan and a 3.7 anonymous@undisclosed.example.com (Anonymous) Mon, 08 Jul 2024 10:32:11 +0000