Northrop Grumman의 Pegasus XL 로켓은 NASA의 Ionospheric Connection Explorer (ICON) 위성을 플로리다의 동해안에서 공중 발사 한 후 대략 357 마일 (575 킬로미터)의 궤도에 배치하는데 약 11 분이 걸릴 것이다. 39,000 피트 (11,900 미터)의 고도에서 대서양을 가로 지르는 동쪽으로 비행하는 Stargazer라는 L-1011 캐리어 비행기의 뱃대에서 거의 53,000 파운드 (24 미터)의 로켓이 떨어질 것이다. 44 번째 궤도 임무에 착수 한 페가수스 로켓은 NASA의 ICON 위성을 궤도에 진입시켜 지구 대기권의 기상이 전리층 공간의 가장자리에서 플라즈마 상태에 어떻게 영향을 미치는지를 연구하기위한 궤도에 궤도에 진입했다. 무선 통신 및 위성 항법을 방해 할 수있는 경계. 아래 이미지는 이전 비행에서 촬영 한 것입니다. 자료 출처 : NASA / Northrop Grumman
<img class="alignnone size-full wp-image-35303" src="https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/peg_icon_timeline.jpg" alt="" width="800" height="524" srcset="https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/peg_icon_timeline.jpg 800w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/peg_icon_timeline-300x197.jpg 300w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/peg_icon_timeline-768x503.jpg 768w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/peg_icon_timeline-678x444.jpg 678w" sizes="(max-width: 800px) 100vw, 800px" />
T-00:00: Pegasus Drop
The 57-foot-long Pegasus XL rocket is released from the Orbital Carrier Aircraft off the east coast of Florida at an altitude of 39,000 feet above the Atlantic Ocean and a speed of Mach 0.82. T+00:05: First Stage Ignition
After falling for five seconds to a distance of about 300 feet below the L-1011, the first stage Orion 50S XL solid-fueled motor of Pegasus is ignited to begin the powered journey to orbit with ICON. Between drop and ignition, the Pegasus XL’s destruct system is armed. T+00:36: Max-Q
The Pegasus XL flies through the phase of maximum aerodynamic pressure, and the Orion 50S XL continues firing, reaching a peak power level of about 163,000 pounds of thrust. T+01:17: First Stage Burnout
The Orion 50S XL first stage motor consumes all of its solid-fuel propellant and burns out at an altitude of more than 177,000 feet, or 53.9 kilometers. T+01:33: First Stage Separation/Second Stage Ignition
The spent first stage motor is jettisoned at T+plus 1 minute, 33 seconds, to prepare for the second stage of flight. The first stage casing falls into the Atlantic Ocean. One second later, Orion 50 XL motor ignites at an altitude of 237,000 feet (72.1 kilometers) to continue the flight into orbit. T+02:10: Fairing Jettison
The 50-inch-diamter (1.3-meter) payload fairing that protected the ICON during atmospheric ascent is separated once heating levels drop to predetermined limits at an altitude of around 381,000 feet (116 kilometers). The second stage motor continues its burn with 44,000 pounds of thrust. T+02:48: Second Stage Burnout
The Orion 50 XL second stage motor consumes all its solid fuel, then begins a four-minute coast phase for the rocket to climb to the targeted altitude for the ICON mission. During this time, the rocket’s on-board computer calculates when it needs to ignite the third stage based on the performance of the booster to this point. T+07:00: Second Stage Separation
The Pegasus XL’s second stage separates from the third stage. T+07:11: Third Stage Ignition
The Pegasus XL’s third stage Orion 38 motor fires for a planned 69-second burn to accelerate the ICON satellite to orbital velocity. T+08:20: Third Stage Burnout
The third stage Orion 38 solid-fueled motor burns out. The mission is targeting a circular orbit 357 miles (575 kilometers) above Earth at an inclination of 27 degrees. T+11:20: ICON Separation
<img class=" wp-image-35219" src="https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/9a-NEW_ICON-Image_Portrait-082918a-Copy-1024x704.jpg" alt="" width="679" height="467" srcset="https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/9a-NEW_ICON-Image_Portrait-082918a-Copy-1024x704.jpg 1024w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/9a-NEW_ICON-Image_Portrait-082918a-Copy-1024x704-300x206.jpg 300w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/9a-NEW_ICON-Image_Portrait-082918a-Copy-1024x704-768x528.jpg 768w, https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2018/11/9a-NEW_ICON-Image_Portrait-082918a-Copy-1024x704-678x466.jpg 678w" sizes="(max-width: 679px) 100vw, 679px" /> The attitude control thrusters on the Pegasus XL’s third stage will re-orient the vehicle for the deployment of the ICON satellite. The spacecraft is programmed to begin extending its solar panel within about 100 seconds of separation from the Pegasus third stage.
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