Exoplanetary Circumstellar Environments and Disk Explorer

Exoplanetary Circumstellar Environments and Disk Explorer
Orbital elements
Mission type	Space observatory
Launch date	2019
Mission duration	3 + 2 years
Orbits	Sun synchronous Low Earth Orbit
Homepage	EXEDE Home Page
Semimajor axis	2000 km
Inclination	105°
Orbital period	127 min

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. The spacecraft will 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. 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 Dr. Glenn Schneider.

Scientific goals

Explore the amount of dust in habitable zones
Determining if such a disk interferes with future planet finding missions (dust-scattered starlight causes noise in images of exoplanets^[1])
Determine composition of material delivered to planets. Icy and organich-rich particles are important for life.^[2]
Determine of fraction of massive planets on large orbits
Observe how protoplanetary disks make Solar System-like architectures
Constrain giant planets' composition by measuring their reflectivity^[3] EXCEDE will be the first to image (giant) exoplanets distances from their stars similar to ours (0.5-7 AU).^[4]

References

↑ "Future Mission Impacts?". EXCEDE Homepage. Retrieved 25 February 2012. External link in |publisher= (help)
↑ "Delivery of Planet Veneers". EXCEDE Homepage. Retrieved 25 February 2012. External link in |publisher= (help)
↑ "CS Disks: Signposts of Planets". EXCEDE Homepage. Retrieved 24 February 2012. External link in |publisher= (help)
↑ "Cool Giant Exoplanets". EXCEDE Homepage. Retrieved 25 February 2012. External link in |publisher= (help)

"EXCEDE Home". Retrieved 2012-02-24.

Explorers program

Explorer 1 2 3 4 5 6 (S-2) 7 (S-1a) 8 S-56 9 (S-56A) 10 11 (S-15) 14 (EPE-B) 17 (AE-A) 19 30 (Solrad 8) 32 (AE-B) 33 (IMP-D) 34 35 (IMP-E) 37 (Solrad 9) 39 42 (Uhuru) 44 (Solrad 10) 48 (SAS B) 49 (RAE-B) 52 (Hawkeye 1) 53 (SAS C) 57 (IUE) 58 (HCMM) 59 (ICE) 61 (Magsat) 62 (DE-1) 63 (DE-2) 64 (SME) 66 (COBE) 67 (EUVE) 68 (SAMPEX) 69 (RXTE) 70 (FAST) 71 (ACE) 72 (SNOE) 73 (TRACE) 74 (SWAS) 75 (WIRE) 77 (FUSE) 78 (IMAGE) 79 (HETE-2) 80 (WMAP) 81 (RHESSI) 82 (CHIPSat) 83 (GALEX) 84 (Swift) 85 thru 89 (THEMIS) 90 (AIM) 91 (IBEX) 92 (WISE) 93 (NuSTAR) 94 (IRIS)

Italics indicates probes that failed to deploy or otherwise malfunctioned

Exoplanet search projects

Ground-based

Space missions

Past and current	MOST (2003–present) SWEEPS (2006) COROT (2006–2013) EPOXI (2008–2013) Kepler (2009–present) KOI exoplanets Gaia (2013–present)

Planned	CHEOPS (2017) TESS (2017) James Webb Space Telescope (2018) PLATO (2024)

Proposed	ATLAST EXCEDE FINESSE New Worlds Mission PEGASE WFIRST-AFTA

Cancelled	Darwin EChO Eddington Space Interferometry Mission Terrestrial Planet Finder

Space observatories

Current	AGILE AMS-02 Astrosat CALET Chandra (AXAF) DAMPE Fermi Gaia Hinode (Solar-B) HiRISE Hisaki (SPRINT-A) Hitomi (Astro-H) Hubble INTEGRAL IBEX IRIS Kepler LISA Pathfinder MAXI MOST NEOSSat NuSTAR Odin PAMELA R/HESSI SDO SOHO SOLAR Spektr-R Spitzer Swift TUGSAT-1 & UniBRITE-1 WISE XMM-Newton

Planned	HXMT (2016) ISS-CREAM (2016) NICER (2016) CHEOPS (2017) Nano-JASMINE (2017) Spektr-RG (2017) TESS (2017) James Webb (JWST) (2018) K-EUSO (2019) Public Telescope (PST) (2019) iWF-MAXI (2019+) Astro-1 Telescope (2020) Euclid (2020) Spektr-UV (2021) SVOM (2021) Space Solar Telescope Solar-C (2023) PLATO (2024) ATHENA (2028) eLISA (2034)

Proposals	ATLAST DIOS EXCEDE Fresnel Imager FINESSE FOCAL HDST Hypertelescope LiteBIRD NEOCam New Worlds Mission NGHXT NRO donation to NASA Solar-D SPICA THEIA WFIRST EUSO

Completed	Akari (Astro-F) (2006–2011) ALEXIS (1993–2005) ATM (1973–1974) ASCA (Astro-D) (1993–2000) Astro-1 (BBXRT HUT) (1990) Astro-2 (HUT) (1995) Astron (1983–1989) ANS (1974–1976) BeppoSAX (1996–2003) CHIPSat (2003–2008) Compton (CGRO) (1991–2000) COROT (2006–2013) Cos-B (1975–1982) COBE (1989–1993) EPOCh (2008) EPOXI (2010) EXOSAT (1983–1986) EUVE (1992–2001) FUSE (1999–2007) Kvant-1 (1987–2001) GALEX (2003–2013) Gamma (1990–1992) Ginga (Astro-C) (1987–1991) Granat (1989–1998) Hakucho (CORSA-ｂ) (1979–1985) HALCA (MUSES-B) (1997–2005) HEAO-1 (1977–1979) Herschel (2009–2013) Hinotori (Astro-A) (1981–1991) HEAO-2 (Einstein Obs.) (1978–1982) HEAO-3 (1979–1981) HETE-2 (2000–2007?) Hipparcos (1989–1993) IUE (1978–1996) IRAS (1983) IRTS (1995–1996) ISO (1996–1998) IXAE (1996–2004) Kristall (1990–2001) LEGRI (1997–2002) MSX (1996–1997) OAO-2 (1968–1973) OAO-3 (Copernicus) (1972–1981) Orion 1/2 (1971/1973) Planck (2009–2013) RELIKT-1 (1983–1984) ROSAT (1990–1999) Rossi X-ray (RXTE) (1995–2012) SAMPEX (1992–2004) SAS-B (1972–1973) SAS-C (1975–1979) Suzaku (Astro-EII) (2005–2015) Taiyo (SRATS) (1975–1980) Tenma (Astro-B) (1983–1985) Uhuru (1970–1973) WMAP (2001–2010) 1st mission WISE (2009–2011) Yokoh (Solar-A) (1991–2001)

Lost	e.g. launch failures: OAO-1/OAO-B (1966/1970) CORSA (1976) ABRIXAS (1999) HETE (1996) WIRE (1999) Astro-E (2000)

Completed	hibernating after mission: SWAS (1998–2005) TRACE (1998–2010)

Cancelled	Astro-G Constellation-X Darwin Destiny EChO Eddington FAME GEMS IXO JDEM LOFT SIM & SIMlite SNAP TAUVEX TPF XEUS

See also	Great Observatories program List of space telescopes List of proposed space observatories

Category

Future spaceflights

Manned

2016	Soyuz TMA-20M (March) Soyuz MS-01 (May) Soyuz MS-02 (September) Soyuz MS-03 (November)

2017	Soyuz MS-04 (March) Soyuz MS-05 (May) Soyuz MS-06 (September) Soyuz MS-07 (November)

2018	Soyuz MS-08 (March) Soyuz MS-09 (September)

TBA	Shenzhou 11 (aiming at 2017) SpX-DM2 (April 2017) Boe-CFT (July 2017) Orion EM-2 (aiming at 2023) Orion EM-3 (aiming at 2026)

Unmanned

2016	ASNARO-2 Cygnus CRS Orb-5 (31 May) Cygnus CRS Orb-6 (10 March) Cygnus CRS Orb-7 (4 October) ERG ExoMars Trace Gas Orbiter (March) Galileo FOCs GOES-R (October) Hard X-ray Modulation Telescope Himawari 9 Hispasat AG1 Kounotori 6 Nano-JASMINE Orbital Technologies Commercial Space Station OSIRIS-REx (September) RLV-TD (April) Sentinel-2B Sentinel-3A (16 February) Sentinel-5 Precursor SpaceX CRS-8 (February) SpaceX CRS-9 (March) SpaceX CRS-10 (June) SpaceX CRS-11 (August) SpaceX CRS-12 (December) Tiangong-2

2017	Aditya (2017–2018) ADM-Aeolus BepiColombo (January) Boe-OFT (April) Space Complex Alpha Chandrayaan-2 Chang'e 5 CHEOPS Cygnus CRS Orb-8E Cygnus CRS Orb-9E GCOM-C / SLATS GOSAT-2 / KhalifaSat ICESat-2 Kounotori 7 Kuafu Nauka (February) PRISMA SELENE-2 Spektr-RG TESS (August)

2018	Chang'e 4 Cygnus CRS Orb-10E EarthCARE ExoMars rover (May) James Webb Space Telescope (October) Kounotori 8 Orion EM-1 / Lunar Flashlight / NEA Scout (November) Solar Orbiter (October) Solar Probe Plus (31 July) Uzlovoy Module (Q3)

2019	DRTS-2 Kounotori 9 SLIM

2020+	AIDA (October 2020, July 2021) Chang'e 6 (2020) Euclid (2020) Hope (2020) Mars 2020 (2020) Spektr-UV (2021) MetOp-SG (2021–22) FLEX (2022) Jupiter Icy Moon Explorer (2022) Tiangong-3 (2022) Luna-Glob (2024) PLATO (2024) Venera-D (2024) Europa Multiple-Flyby Mission (2025) ATHENA (2028) LISA (2034)

Recently launched

Hitomi (17 February)

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