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iOptron 8401 manual FIG. D3, δ, declination α, right ascension

Models: 8401

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	Celestial	Zenith
	North Pole	Zenith
	North Pole

median of location

hour circle

East

North

Celestial Equator

δ, declination

α, right ascension

South

West

γ	axis of rotation
gamma point

Observer’s horizon

star hour circle

Nadir	Celestial
	South Pole

FIG. D3

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Image 30

iOptron 8401 manual FIG. D3, δ, declination α, right ascension

Contents

Manual www . iOptron . comGoToNovaTM 8401 Hand-Held Controller Page CONTENTS Page Chapter 0 Quick Start Reference Useful Links Sky and TelescopeThe Hubble Site http//hubblesite.orgA GPS module makes life a lot easier. It automatically sets the time and location for you 0.2 Getting StartedSet Local Time 2007-06-18 Daylight Time saving√ What’s Next? 1.1 Set Up Chapter.1 Set Up And Alignment1.0 Basic Symbols Appendix1.2.2 Two-Star Align NEVER LOOK DIRECTLY AT THE SUN WITH THE NAKED EYES OR WITH Chapter. 2 Select And SlewAppendix You can define and save new celestial objects in the database2.5.5 SAO Bright Stars 2.5 Stars 2.5.1 Named Stars Contains 191 stars 2.5.2 Constellations2.5.4 Variable Stars 2.6 Constellations Contains 88 constellations 2.7 User ObjectsAppendix Chapter. 3 Other Functions3.4 Set up tracking Set up tracking speed 3.5 User objects Check Appendix A for complete menu structuresEquatorial Mode FIG.44.2 Observing using arrow keys Chapter. 4 How to ObserveUse slower speed for fine tuning People usually use alt-zi mode to observe land objects4.4 Tracking APPENDIX A MENU STRUCTURE o M51 The Whirlpool Galaxy spiral galaxy APPENDIX B Messier Catalogo M44 Praesepe, the Beehive Cluster open cluster o M63 Sunflower galaxy spiral galaxyo M43 part of the Orion Nebula de Mairans Nebula diffuse nebula o M57 The Ring Nebula planetary nebulao M42 The Great Orion Nebula diffuse nebula o M76 The Little Dumbell, Cork, or Butterfly planetary nebulao M11 The Wild Duck Cluster open cluster o M6 The Butterfly Cluster open clustero M7 Ptolemys Cluster open cluster o M1 The Crab Nebula supernova remnantconstellation APPENDIX CModern Constellations genitiveCanis Minoris 1690, Firmamentum Sobiescianum, Hevelius Microscopium 1690, Firmamentum Sobiescianum, HeveliusLynx 1624, BartschPuppis PiscesPiscis Austrinus Pyxis1690, Firmamentum Sobiescianum, Hevelius AustraleVolans Altitude APPENDIX D Celestial CoordinatesFIG.D1 AzimuthFIG.D2 δ, declinationt, hour angle FIG. D3 δ, declination α, right ascensionCelestial sphere is an imaginary sphere of infinite radius You need two numbers to define a position on the celestial spherePage Appendix E SPECIFICATIONS GoToNovaTM 8401 SpecificationsItem # Appendix FProducts List ProductIOPTRON TWO YEAR TELESCOPE, MOUNT, AND CONTROLLER WARRANTY