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vatt:dome_flats [2022/02/13 21:34]
paul 		vatt:dome_flats [2022/05/07 04:52] (current)
paul
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     * Suppose you want to obtain dome flats after observing. You will need to close the dome shutters, which should only be done with the mirror cover on. Therefore, stow the telescope, disable drives, close mirror cover, and close dome shutters. Then, open mirror cover, and enable drives.     * Suppose you want to obtain dome flats after observing. You will need to close the dome shutters, which should only be done with the mirror cover on. Therefore, stow the telescope, disable drives, close mirror cover, and close dome shutters. Then, open mirror cover, and enable drives.
     * The telescope is still in the stowed position, i.e., nominally at Az=180°. With Dome tracking enabled, right click on the Dome azimuth field in TCSglue and introduce an offset of +190°. Wait until the dome stops rotating to its offset position, bringing the screen to the South meridian.     * The telescope is still in the stowed position, i.e., nominally at Az=180°. With Dome tracking enabled, right click on the Dome azimuth field in TCSglue and introduce an offset of +190°. Wait until the dome stops rotating to its offset position, bringing the screen to the South meridian.
-    * Slew to RA = LST + 2'  (Local Sidereal Time + 2 min, i.e., round LST up and add a minute), Dec = -27°17'55"((This corresponds to 30° above the horizon: -[(90°-φ)-30°]= φ-60°, where φ = 32°42'05" is the local latitude.)) ((Alternative way, using XEPHEM: find a star close to Alt=29.5°, and Az=179°, and slew to its position ("Telescope Go To" in XEPHEM).)) As a result, the telescope will be tracking (through the closed dome) an object which is about to pass through the south meridian at Alt=30°. Wait until the telescope reaches Az=180°, and Disable Drives. Disable Dome Tracking (otherwise the dome keeps oscillating slightly around the required position).+    * Slew to RA = LST + 2'  (Local Sidereal Time + 2 min, i.e., round LST up and add a minute), Dec = -27°30'00"((-27°17'55" corresponds to 30° above the horizon: -[(90°-φ)-30°]= φ-60°, where φ = 32°42'05" is the local latitude but the telescope pointing compensates for atmospheric refraction.)) ((Alternative way, using XEPHEM: find a star close to Alt=29.5°, and Az=179°, and slew to its position ("Telescope Go To" in XEPHEM).)) As a result, the telescope will be tracking (through the closed dome) an object which is about to pass through the south meridian at Alt=30°. Wait until the telescope reaches Az=180°, and Disable Drives. Disable Dome Tracking (otherwise the dome keeps oscillating slightly around the required position).
  
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vatt/dome_flats.1644813272.txt.gz · Last modified: 2022/02/13 21:34 by paul

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