Digital Universe Guide - Hayden Planetarium

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138 3. THE MILKY WAY ATLAS 1lmo The light-month grid extends to 4 light-weeks, or 1 light-month. Lines of constant radius are drawn for the first 7 light-days, after which lines are drawn each light- week. The overlying grid has increments every two light-weeks. 1ly Beyond the light-month grid is the light-year grid. It consists of lines of constant radius for each light-month and an overlying grid in increments of 6 light-months. Displaying the Oort cloud (oort) along with this grid provides a good measure for the Oort cloud sphere (about 10.5 light-months). 10ly A 10-light-year grid with lines of constant radius every year. Viewing the grid face- on along with the stars, one is able to see the locations of those nearby stars close to the plane. While this is not an exact measuring tool, it’s easy to see that Al- pha Centauri (Proxima) is just more than 4 light-years and Sirius is between 8 and 9 light-years. 100ly A 100-light-year grid with lines of constant radius every 10 light-years. Here we can see the radio sphere’s edge (radec) at 72 light-years with many of the extrasolar planetary systems (expl). 1kly A 1,000-light-year (1-kilo-light-year) grid with lines every 500 light-years and lines of constant radius every 100 light-years. On this scale we see several of the local OB associations (ob) that lie in the Orion Arm (the Sun is located on the inner edge of the Orion Arm, sometimes called a spur), as well as a few of the nearest open clusters (oc). 10kly The 10 kly (10,000-light-year) grid is large enough to view those nearby data sets that are confined to the plane of the Galaxy, more or less. All the OB associations (ob) are found within the grid, as are data from the open clusters (oc), supernova remnants (snr), and H ii regions (h2).
3.3. MILKY WAY DATA GROUPS 139 3.3.38 Galaxy Coordinate Grid Group Name galGrid Reference — Prepared by Brian Abbott (AMNH/<strong>Hayden</strong>) Labels Yes Files galgrid.speck Dependencies none The Galaxy grid spans the Galactic disk. It is 100,000 light-years on each side, and its midpoint is at the Galactic center. The grid lies in the plane of the Galaxy, which is about 50 light-years “below” the Solar System. Labels appear every 10,000 light-years and are in units of kilo-light-years (kly). All of the 3-D data sets lie within this grid except for a handful of globular clusters (gc), some pulsars (pul), and galaxies in the Local Group (lgrp). The grid is complemented by the Milky Way image (galaxy), the Galactic bar (mwbar), the Galactic bulge (bulge), and the Galactic halo (halo), which diagrammatically highlight some of the Galaxy’s structural features.
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The Digital Universe Guide Brian Ab
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Contents Contents 3 List of Tables
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List of Tables 2.1 Log and Linear F
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1.2. GETTING HELP 7 1.2 Getting Hel
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1.5. ACKNOWLEDGMENTS 9 1.5 Acknowle
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2.2. LAUNCHING THE MILKY WAY ATLAS
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2.3. LEARNING TO FLY PARTIVIEW 13 T
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2.3. LEARNING TO FLY PARTIVIEW 15 M
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2.4. PARTIVIEW’S USER INTERFACE 1
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2.5. DIGITAL UNIVERSE FILES 23 File
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3.1. MILKY WAY ATLAS OVERVIEW 25 3.
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3.2. MILKY WAY ATLAS TUTORIAL 27 3.
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3.2. MILKY WAY ATLAS TUTORIAL 29 Wi
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3.2. MILKY WAY ATLAS TUTORIAL 31 Yo
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3.2. MILKY WAY ATLAS TUTORIAL 33 th
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3.2. MILKY WAY ATLAS TUTORIAL 35 Op
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3.2. MILKY WAY ATLAS TUTORIAL 39 co
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3.2. MILKY WAY ATLAS TUTORIAL 41 li
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3.2. MILKY WAY ATLAS TUTORIAL 45 In
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3.2. MILKY WAY ATLAS TUTORIAL 47 No
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3.2. MILKY WAY ATLAS TUTORIAL 49 Th
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3.2. MILKY WAY ATLAS TUTORIAL 51 to
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3.2. MILKY WAY ATLAS TUTORIAL 53 st
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3.2. MILKY WAY ATLAS TUTORIAL 55 th
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3.2. MILKY WAY ATLAS TUTORIAL 57 bi
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3.2. MILKY WAY ATLAS TUTORIAL 59 in
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3.2. MILKY WAY ATLAS TUTORIAL 63 mo
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3.2. MILKY WAY ATLAS TUTORIAL 65 fa
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3.3. MILKY WAY DATA GROUPS 67 Earth
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3.3. MILKY WAY DATA GROUPS 69 Data
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3.3. MILKY WAY DATA GROUPS 71 The l
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3.3. MILKY WAY DATA GROUPS 73 3.3.3
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3.3. MILKY WAY DATA GROUPS 75 3.3.4
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3.3. MILKY WAY DATA GROUPS 77 If yo
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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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Page 145 and 146: 4 The Extragalactic Atlas The word
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4.3. EXTRAGALACTIC DATA GROUPS 189
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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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