Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Types of Orbits (cont.)Types of Orbits (cont.)Types of Orbits (cont.)Slide 19Types of Orbits (cont.)Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Slide 32Slide 33Slide 34Slide 35Slide 36Colorado Space Grant ConsortiumColorado Space Grant ConsortiumGateway To SpaceASEN / ASTR 2500Class #19Gateway To SpaceASEN / ASTR 2500Class #19T-11Circular Orbit:-Announcements-Ready for Flight (RFF) Cards- Orbits and Mission Design – Part III- Spider if before 9:50 AM-Launch is in 11 daysToday:-Still missing one Mid Semester Team evaluation (Team #9)-Turn in today or get a zero score- Launch Readiness reviews will only be one day next week- Each team will only have 5 minutes to present- Please review template carefully- LRR presentations are due 7:00 AM Tuesday- DD Rev C Due Friday, November 4th at check in - Be sure Team # is listed in subject and file nameAnnouncements:-Must be turned in on Friday, November 4th, 2011 -Must be COMPLETE-Receipts for reimbursements turned in on Friday, November 4th, 2011-Prefer only one person per team gets reimbursed-Must prove that have not overspent funds and purchases were legitRFF Cards:-Must be turned in on Friday, November 4th, 2011 -Must be COMPLETE-Receipts for reimbursements turned in on Friday, November 4th, 2011-Prefer only one person per team gets reimbursed-Must prove that have not overspent funds and purchases were legitRFF Cards:Colorado Space Grant ConsortiumColorado Space Grant ConsortiumThursday…In-class Mission SimulationsLRR Review Info9 Days to launchThursday…In-class Mission SimulationsLRR Review Info9 Days to launchColorado Space Grant ConsortiumColorado Space Grant ConsortiumNext Tuesday…LRR PresentationsLRR Cards handed out4 days to launchNext Tuesday…LRR PresentationsLRR Cards handed out4 days to launchColorado Space Grant ConsortiumColorado Space Grant ConsortiumNext Thursday…Launch LogisticsFriday meeting time sign up2 days to launchNext Thursday…Launch LogisticsFriday meeting time sign up2 days to launchColorado Space Grant ConsortiumColorado Space Grant ConsortiumNext Friday…BalloonSat Turn inRFF Cards turned in30 minute turn in timesCompleted by 3:00 PM1 day to launchNext Friday…BalloonSat Turn inRFF Cards turned in30 minute turn in timesCompleted by 3:00 PM1 day to launchColorado Space Grant ConsortiumColorado Space Grant ConsortiumT-11Orbits and Mission Design – Part 3ASEN / ASTR 2500Class #19Orbits and Mission Design – Part 3ASEN / ASTR 2500Class #19Orbit Introduction:What is an orbit?- The path of a satellite around the Earth (or any central body)What shape is it?- Orbits are conic sections- Circles, Ellipses, Parabolas, HyperbolasHow are orbits described?- Position and Velocity at any one time- Keplerian Elements (from Kepler’s Laws)Orbit Definition:Velocity & Position- Given position and velocity of a satellite at time t, you can calculate the position and velocity at any other timeOrbit Definition:Keplerian Elements- Semi major axis (a)- Size- Eccentricity (e)- ShapeOrbit Definition:Keplerian Elements- Inclination (i)- Angle to the EquatorTypes of Orbits (cont.)Geosynchronous/Geostationary (equator)Types of Orbits (cont.)Critical InclinationTypes of Orbits (cont.)Repeating Ground TracePolar/ Sun SynchronousTypes of Orbits (cont.)Types of Orbits (cont.)MolniyaChanging Orbits:How about 250 km to 500 kmHow would you do it?Changing Orbits:Therefore:DV1 is to start transferDV2 is to circularize orbitTime to do transfer isv1  vper viv1  7.83  7.75v1  .08 kmsecsec 07. 54.761.7 222kmvvvvvapofP  2a3*.5P  2(6753)3398600.4* .5P  2,761 sec  46 minv2v1How well do you understand Hohmann Transfers? 123• 1 to 2?• 2 to 3?• 3 to 1? • 1 to 3?To the Moon for Money:To the Moon for Money:To the Moon for Money:So...• One switch controls the light bulb• Light bulb is on 2nd floor• Can’t see it unless you go upstairs• Can flip switches as many times• Can go upstairs once• Which switch is it?• If you could go up twice, how would you do it? • What does a light bulb do?• Besides light?• What about heat?To the Moon for Money:Earth to L1:Earth to Mars:Mars OrbitEarth OrbitTransfer OrbitInitial OrbitFinal Orbitv2v1Earth to Beyond:Say you are in a 250 km orbit...Orbital Velocity:Velocity on parabolic (a=escape trajectory:DV needed:DV will not put you in a orbit, you will escape the Earth’sgravity never to come back sec 75.7 kmviv2 rvesc  2 * 398600.4 (250  6378.14)vesc  10.97 kmsecvesc  3.22 kmsecColorado Space Grant ConsortiumColorado Space Grant ConsortiumQuestions?Questions?T-11Colorado Space Grant ConsortiumColorado Space Grant ConsortiumSpider?Is it before 9:50 AM?Class #19Spider?Is it before 9:50 AM?Class #19WHY I show this