Die Starguider Kamera Gliederung: Prinzip - Installation - Prinzip

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Die Starguider Kamera Gliederung: Prinzip - Installation - Prinzip - Starguider CCD Bild Kalibrierung - Problem - Kalibration - Genauigkeit Ausblick Max-Planck-Institut für Physik Anna Romaszkiewicz

Installation: Prinzip The Starguider compares the position of the detected stars in the camera with the position calculated from the star catalog and is mounted in the middle of the mirror area. Prinzip

Prinzip des Starguiders: erkannte Sterne am Himmel (weiße Kreuze) MJD und Position vom Teleskop sind bekannt erkannte Sterne werden mit einem Sternenkatalog (blaue Punkte) verglichen die Differenz zwischen den zwei Positionen ist das Mispointing Prinzip

Starguider CCD Bild: Daten: Sterne bis 8mag bei einer Integrationszeit von 5s Sichtfeld: 6deg Durchschnittlich 30 Sterne Genauigkeit: Shaftencoder: 0.022 deg Pixelgröße der MAGIC Kamera: 0.1deg Pixelgröße der CCD Kamera: 48.8 arcsec Prinzip

Deformierung des Teleskops: Das Gewicht der MAGIC Kamera wirkt sich auf die leichte Struktur des Teleskops aus Ziel: Pointing- Genauigkeit von 0.005 deg Kalibrierung

Kalibration 1: heller Referenzstern in der Mitte des CCD Bildes camera bright star reflected star image LED camera heller Referenzstern in der Mitte des CCD Bildes Mittelpunkt der MAGIC Kamera errechnet durch drei LEDs reflektierter Stern im Zentrum der MAGIC Kamera The current tracking accuracy of the angular position is 0.022deg, given by the shaft encoders. To improve this, we use the Starguider. In this picture you see on the left site the camera and in his Centrum the reflected star. And on the right site you see the sky with the bright star. The Center of the camera is calculated by the tree LEDs around. We move the telescope in this way that the reflected star is in the middle of the camera. By knowing the exactly time and the position of the telescope we can compare the real position of the bright star in the sky, how we see it in this picture, and the position of the star from the SAO catalog (SAO := Smithsonian Astrophysical Observatory) . The differences give us the Mispointing. -> Pune 2005/page3! Kalibrierung

Kalibration 2: erkannte Sterne im CCD Kamera Bild (weiße Kreuze) gefundene nominelle Sterne aus dem Sternenkatalog (blaue Punkte) Differenz der beiden entspricht dem nominellen Starguider Mispointing Reflektiertes Bild des Referenzstern Zentrum der MAGIC Kamera (aus LEDs berechnet) Differenz der beiden entspricht dem wahren Mispointing Der Vergleich zwischen den beiden Mispointings wird zur Kalibration verwendet Kalibrierung

Genauigkeit des Starguiders vor Kalibration Preliminary Kalibrierung

Preliminary Kalibrierung

Ausblick: Kalibration als Funktion von Zenith und Azimut Verbesserung der intrinsischen Starguider- Genauigkeit durch Modifizierung der Bilderkennungsalgorithmus Ziel: Pointing- Genauigkeit von 0.005 deg erreichen Ausblick