Digital Universe Guide - Hayden Planetarium

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28 3. THE MILKY WAY ATLAS When you start the Milky Way Atlas, you are on a unique point. In Partiview it is called the Point of Interest. The Point of Interest is the point about which rotations and orbiting take place. In the Milky Way Atlas, it is set to the Sun’s location at (x, y, z) = (0, 0, 0). (You are actually positioned a negligible distance from the Point of Interest for reasons we’ll discuss later in this section.) Panning Around the Sky With the left mouse button pressed, move the mouse inside the Graphics Window to pan around the sky. You will notice the stars, a few star labels, and the band of the Milky Way. The stars resemble those in the sky in luminosity and color. We place a texture, or image, on each, giving depth to the star field. If you don’t care for these textures, you can click the Polygon Toggle Button to turn off the star’s polygons (the textures are drawn on polygons). Remember, for this change to take effect, stars must be the active group. (A group becomes active when you right-click on its Group Button or select it from the Group Menu.) Of course, once you turn the textures off, the stars will all look similar to one another, so we prefer to have the polygons on. Moving Off the Point of Interest Let’s exercise our navigational skills. Partiview starts in the Orbit Flight Mode. You can confirm this by looking at the active flight mode printed below the Flight Mode Menu, which should read [o]rbit. You’ve seen what the left button does from this position; it moves your head without moving your position in space. If you try holding the right button down, you won’t see too much happen. Because Orbit Mode is a logarithmic flight mode, you will have zero speed when sitting on the Point of Interest. Because you’re not exactly on the Point of Interest, you are likely to begin moving backward or forward after some time, but who wants to wait? Now, using the Flight Mode Menu, switch the flight mode to [f]ly. With the right button, fly backward away from the Sun. Fly is a linear flight mode, so it remains the same speed no matter where you are in the Atlas. Using the left button in Fly Mode, pan around a bit, keeping the Sun in view. Here you’re moving your head but not your position. Using the Keyboard to Switch Flight Modes Now switch back to Orbit Flight Mode. With the left button, you will now orbit the Point of Interest, in this case the Sun. The bracketed first letter in each flight mode may be used in the Graphics Window to switch flight modes. To test this, activate the Rotate Flight Mode by pressing r (must be lowercase) in the Graphics
3.2. MILKY WAY ATLAS TUTORIAL 29 Window. You should see [r]ot appear below the Flight Mode Menu. You’ll quickly notice that the left button is the same as Orbit Flight Mode, orbiting the Point of Interest. The right button twists the view about the Point of Interest, in a plane parallel to your screen. Translate Flight Mode Finally, switch to Translate Flight Mode using the t key and, with the left button pressed, move the mouse. Here you move your position but always keep your eyes forward. The data always move parallel to your screen in the direction of mouse motion. The right button moves you forward or backward. Now switch to Orbit Mode and press the Home Button to bring you back to the Earth’s view. You’re ready to continue to the next tutorial. Tutorial: Constellations Goals: To become familiar with the constellations data set; altering the transparency and color values for objects and labels. Before starting, turn on: stars, mwVis, constel You will be using: alpha, cment, and the textcment commands Much as we might spot a cloud in the sky and imagine what it resembles, ancient astronomers looked to the stars and dreamed of the heroes and cowards, animals and monsters, or kings and queens of their lore. Given this task today, perhaps we would see star patterns in the form of Gandhi, a computer, or an airplane. The constellations adopted by astronomers include those from ancient Greek times as well as several modern constellations, mostly in the sky as seen from the Southern Hemisphere. For more information on their origin, see “Constellation Connectivity Lines.” We represent these celestial beings as “stick figures” connecting the bright stars that form their shapes. There are three colors assigned to the constellations in the mw.cf file. Most constellations have a dark pink shade. The zodiacal constellations are bright red and Orion and Ursa Major are given a blue color. The data also have labels associated with them. These labels are placed at an arbitrary distance of 65 light-years. Brightening the Lines If you want to brighten or dim the constellation lines, you must use the alpha command. (The slum command that scales the luminosity works only on points.) Use the Alpha
Page 1 and 2: The Digital Universe Guide Brian Ab
Page 3 and 4: Contents Contents 3 List of Tables
Page 5 and 6: List of Tables 2.1 Log and Linear F
Page 7 and 8: 1.2. GETTING HELP 7 1.2 Getting Hel
Page 9 and 10: 1.5. ACKNOWLEDGMENTS 9 1.5 Acknowle
Page 11 and 12: 2.2. LAUNCHING THE MILKY WAY ATLAS
Page 13 and 14: 2.3. LEARNING TO FLY PARTIVIEW 13 T
Page 15 and 16: 2.3. LEARNING TO FLY PARTIVIEW 15 M
Page 17 and 18: 2.4. PARTIVIEW’S USER INTERFACE 1
Page 23 and 24: 2.5. DIGITAL UNIVERSE FILES 23 File
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Page 27: 3.2. MILKY WAY ATLAS TUTORIAL 27 3.
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Page 67 and 68: 3.3. MILKY WAY DATA GROUPS 67 Earth
Page 69 and 70: 3.3. MILKY WAY DATA GROUPS 69 Data
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Page 73 and 74: 3.3. MILKY WAY DATA GROUPS 73 3.3.3
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3.3. MILKY WAY DATA GROUPS 79 lumin
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3.3. MILKY WAY DATA GROUPS 81 not p
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3.3. MILKY WAY DATA GROUPS 83 Two p
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3.3. MILKY WAY DATA GROUPS 85 expre
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3.3. MILKY WAY DATA GROUPS 87 marke
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3.3. MILKY WAY DATA GROUPS 89 brigh
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3.3. MILKY WAY DATA GROUPS 91 3.3.1
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3.3. MILKY WAY DATA GROUPS 93 inclu
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3.3. MILKY WAY DATA GROUPS 95 old.
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3.3. MILKY WAY DATA GROUPS 97 centi
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3.3. MILKY WAY DATA GROUPS 99 3.3.1
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3.3. MILKY WAY DATA GROUPS 101 3.3.
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3.3. MILKY WAY DATA GROUPS 103 heat
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3.3. MILKY WAY DATA GROUPS 107 righ
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3.3. MILKY WAY DATA GROUPS 109 beyo
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3.3. MILKY WAY DATA GROUPS 121 Othe
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3.3. MILKY WAY DATA GROUPS 125 Obje
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3.3. MILKY WAY DATA GROUPS 141 this
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3.3. MILKY WAY DATA GROUPS 143 Not
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4 The Extragalactic Atlas The word
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4.1. EXTRAGALACTIC ATLAS OVERVIEW 1
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4.2. EXTRAGALACTIC ATLAS TUTORIAL 1
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4.3. EXTRAGALACTIC DATA GROUPS 169
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4.4. OPTIMIZING THE EXTRAGALACTIC A
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Appendix A Light-Travel Time and Di
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Appendix B Parallax and Distance On
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absolute magnitude M, can be calcul
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discovered that there was a linear
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Appendix D Electromagnetic Spectrum
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Appendix E Constants and Units In a
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Metric Prefixes These prefixes are
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INDEX 221 center command, 50, 61 cl
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INDEX 223 Earth’s radio signals,
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INDEX 225 irregular galaxy, 147, 17
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INDEX 227 entering, 21 every, 206 j
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INDEX 229 stellar distance uncertai
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Digital Universe Guide - Hayden Planetarium

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