01-IntroTelescope - Name________________________

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Unformatted text preview: Name________________________ Section______________________ Date_________________________ 1. Introduction to Observational Astronomy Objective: Learn how to use a telescope to make astronomical observations. Terms to know: Reflector Schmit ­Cassegrain Altitude ­Azimuth mount Primary mirror Eyepiece Field of View Focal length Magnification Procedure: • Read the below information about the equipment we will be using this semester for observing the sky. Familiarize your self with the telescope and its parts. • Also read pp25 – 29 in the Celestron instruction manual (and any other pages that might be helpful!) • Inspect each of the eyepiece and filters, and understand the purpose of each. Calculate the magnification power of each eyepiece on your data sheet. • Take telescope either into the hallway or up onto the green and look at something relatively far away, focusing the image. Remember to NEVER point the telescope at the sun. NEVER. Equipment: Telescope: • 6 inch Celestron Schmit ­Cassegrain reflector – Alt ­Az mount (See Figure 1) A 6 ­inch telescope is one for which the diameter of the primary mirror of the telescope is 6 inches (152.4 mm). The greater the diameter of this mirror, the more light it can capture. Because of the mirror, each image is flipped left to right from what we view with our eyes. The magnifying power of your telescope is given by the ratio of the focal length of the mirror (fm) to the focal length of the eyepiece (fe): Magnification = fm /fe. The focal length of your telescope is 1524 mm (5 feet). Also, this telescope produces a mirror image of the actual object, with left and right reversed. • Powertank Eyepieces and Filters • 4, 6, 9, 15, 25, 32 mm Plossl eyepieces • 2X Barlow lens  ­ complements Plossl eyepieces in this kit and gives you a total of 10 magnification combinations. The Barlow lens doubles the magnifying power of any eyepiece it's used with. • Colored, lunar and planetary eyepiece filters  ­ Included are Kodak Wratten #12, #21, #25, #56, #58A, and #80A. • 1.25 ­inch moon filter  ­ A neutral density filter that allows maximum enjoyment of moon ­viewing, especially during the brighter phases. Other equipment: • NexImage Celestron Solar System Imager o CCD chip – Charge ­Coupled Device o Resolution: 649x480 o Used to image the moon and the planets • Lenovo laptop with Windows 7 o Installed with imaging and analyzing software for NexImage o Installed with Stellarium software Figure 1: Telescope parts. Name________________________ Section______________________ Date_________________________ Record Sheet: Introduction to Observational Astronomy Objective: Learn how to use a telescope to make astronomical observations. Define the following terms: (1pt each) 1. Reflector telescope 2. Schmit ­Cassegrain telescope 3. Altitude ­Azimuth mount 4. Primary mirror 5. Eyepiece 6. Field of View 7. Focal length 8. Magnification Calculate the magnification of the following eyepieces if they are used with the 6 inch Celestron telescope. (1pt each) 4mm 6 mm 9 mm 15 mm 25 mm 32 mm So, if we need a larger magnification, do we need to use a larger or smaller eyepiece? (2pt) On the celestial sphere: (2 pt each) Right Ascension (R.A.) is the equivalent to what on the earth’s globe? Declination is the equivalent to what on the earth’s globe? ...
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