| 词条 | Exoplanetary Circumstellar Environments and Disk Explorer |
| 释义 |
| name = Exoplanetary Circumstellar Environments and Disk Explorer | names_list = | image = | image_caption = | image_alt = | image_size = | mission_type = Space observatory | operator = | COSPAR_ID = | SATCAT = | website = {{url|http://soweb.as.arizona.edu/~gschneider/EXCEDE_OVERVIEW.html}} | mission_duration = 3 years nominal (proposed)[1] | spacecraft = | spacecraft_type = | spacecraft_bus = | manufacturer = | launch_mass = | BOL_mass = | dry_mass = | payload_mass = | dimensions = | power = | launch_date = | launch_rocket = | launch_site = | launch_contractor = | orbit_reference = Geocentric | orbit_regime = Sun Synchronous | orbit_longitude = | orbit_slot = | orbit_semimajor = 2,000 km | orbit_eccentricity = | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = 105° | orbit_period = 127 min | orbit_RAAN = | orbit_arg_periapsis = | orbit_mean_anomaly = | orbit_mean_motion = | orbit_repeat = | orbit_velocity = | orbit_epoch = | orbit_rev_number = | apsis = gee | instrument_type = | telescope_name = | telescope_type = | telescope_diameter = {{convert|70|cm|abbr=on}}[1] | telescope_focal_length= | telescope_area = | telescope_wavelength = | telescope_resolution = | instruments = Imaging polarimeter | programme = Explorers program[1] | previous_mission = | next_mission = }} Exoplanetary Circumstellar Environments and Disk Explorer (EXCEDE) is a proposed space telescope for NASA's Explorer program to observe circumstellar protoplanetary and debris discs and study planet formation around nearby (within 100 parsecs) stars of spectral classes M to B.[1] Had it been selected for development, it was proposed to launch in 2019. The spacecraft concept proposed to use a 70 centimeter diameter telescope-mounted coronagraph called PIAA (Phase Induced Amplitude Apodized Coronagraph) to suppress starlight in order to be able to detect fainter radiation of circumstellar dust.[1] Characterizing constitution of such disks would provide clues for planetary formation (mostly in habitable zones), while already existing exoplanets can be detected through their interaction with dust disk. The project's Principal Investigator is Glenn Schneider.[1] Science goalsThe science goals of the concept mission are: [1]
References1. ^1 2 3 4 5 6 [https://arxiv.org/ftp/arxiv/papers/1210/1210.3005.pdf The EXoplanetary Circumstellar Environments and Disk Explorer (EXCEDE)]. (PDF). Olivier Guyon, Glenn Schneider, Ruslan Belikov, Domenick J. Tenerelli. arXive repository. 10 October 2012. {{doi|10.1117/12.927188}} {{Explorer program}}{{Exoplanet search projects}}{{Space observatories}}{{Use American English|date=January 2014}}{{US-spacecraft-stub}}2. ^{{cite web|title=Future Mission Impacts?|url=http://soweb.as.arizona.edu/~gschneider/EXCEDE_OVERVIEW_011.html|accessdate=25 February 2012|publisher=Glenn Schneider}} 3. ^{{cite web|title=Delivery of Planet Veneers|url=http://soweb.as.arizona.edu/~gschneider/EXCEDE_OVERVIEW_012.html|accessdate=25 February 2012|publisher=Glenn Schneider}} 4. ^{{cite web|title=CS Disks: Signposts of Planets|url=http://soweb.as.arizona.edu/~gschneider/EXCEDE_OVERVIEW_006.html|accessdate=24 February 2012|publisher=Glenn Schneider}} 5. ^{{cite web|title=Cool Giant Exoplanets |url=http://soweb.as.arizona.edu/~gschneider/EXCEDE_OVERVIEW_015.html|accessdate=25 February 2012|publisher=Glenn Schneider}} 3 : Space observatories|Explorers program (NASA)|Exoplanet search projects |
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