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| spacecraft_bus = MicroStar-1 | manufacturer = Orbital Sciences | launch_mass = | dry_mass = 〔 | payload_mass = 〔 | dimensions = 〔 | power = 66 W (116 W max)〔 | launch_date = UTC | launch_rocket = Pegasus XL | launch_site = | launch_contractor = Orbital Sciences | entered_service = January 2009〔 | disposal_type = | deactivated = | last_contact = | orbit_reference = Geocentric | orbit_regime = High Earth | orbit_semimajor = | orbit_eccentricity = 0.62629 | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = 16.8631° | orbit_period = 12,963.0 min | orbit_RAAN = 95.1780° | orbit_arg_periapsis = 77.2187° | orbit_mean_anomaly = 357.889° | orbit_mean_motion = 0.11108 rev/day | orbit_epoch = August 15, 2015, 08:48:38 UTC | orbit_rev_number = 289 | apsis = gee | instruments = IBEX-Lo, IBEX-Hi | programme = Explorers program | previous_mission = 90: AIM | next_mission = 92: WISE }} Interstellar Boundary Explorer (IBEX) is a NASA satellite that is making a map of the boundary between the Solar System and interstellar space. The mission is part of NASA's Small Explorer program and launched with a Pegasus-XL rocket on October 19, 2008. Results from IBEX have repeatedly shocked the scientific community and overturned old theories.〔 The first shock came when it revealed a narrow ribbon of energetic neutral atom (ENA) emission.〔 Then it showed shifts over time in this band.〔 Another surprise came when no bow shock was found.〔(NASA - IBEX Reveals a Missing Boundary At the Edge Of the Solar System )〕 The repercussions of overturning the bow shock theory are huge, because decades of research are based on that concept.〔 The design and operation of the mission is being led by the Southwest Research Institute, with the Los Alamos National Laboratory and the Lockheed Martin Advanced Technology Center serving as co-investigator institutions responsible for the IBEX-Hi and IBEX-Lo sensors respectively. The Orbital Sciences Corporation manufactured the spacecraft bus and was the location for spacecraft environmental testing. The nominal mission baseline duration was two years to observe the entire Solar System boundary. This was completed by 2011 and its mission was extended to 2013 to continue observations.〔(IBEX - Update Archive )〕 IBEX is in a Sun-oriented spin-stabilized orbit around the Earth. In June 2011, IBEX was shifted to a new more efficient orbit.〔 It does not come as close to the Moon in the new orbit, and expends less fuel to maintain its position.〔 == Payload == The heliospheric boundary of the Solar System is being imaged by measuring the location and magnitude of charge-exchange collisions occurring in all directions. This will ultimately yield a map of the termination shock of the solar wind. The satellite's payload consists of two energetic neutral atom (ENA) imagers, IBEX-Hi and IBEX-Lo. Each of these sensors consists of a collimator that limits their fields-of-view, a conversion surface to convert neutral hydrogen and oxygen into ions, an electrostatic analyzer (ESA) to suppress ultraviolet light and to select ions of a specific energy range, and a detector to count particles and identify the type of each ion. The IBEX-Hi instrument is recording particle counts in a higher energy band than the IBEX-Lo does. The scientific payload also includes a Combined Electronics Unit (CEU) that controls the voltages on the collimator and the ESA, and it reads and records data from the particle detectors of each sensor. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Interstellar Boundary Explorer」の詳細全文を読む スポンサード リンク
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