Eddington artist impression

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Eddington artist impression
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ESA Eddington - vital statistics
3 x 0.9m co-aligned Schmidt telescopes 3
colour filters
18 x 3Kx2K E2V frame-transfer CCDs 1Mhz (2-8s)
readout
FoV25 sq deg 3 arcsec/pix defocus psf 10-30
arcsec diam
Soyuz/Fregat Launch L2 orbit 2008 June 5
(3?) year mission
Eddington UK PPRP
Birmingham 10 Oct 2003
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Eddington Science
Discovery of Small Planets -- hot and habitable
Earths
(Albedo of hot Jupiter atmospheres)
Seismology of Stars -- ages for all major stellar
populations
thousands of stellar interior maps
1 ages, metalicities.
Mixing/rotation 10-20 fields
t1-3 mo
Exploration of time domain discovery space
Eddington UK PPRP
Birmingham 10 Oct 2003
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Seismology of Stars

• stellar interior maps across the H-R diagram
  - age-rotation (meridional circulation)
  - low-mass stars
  (settling of H, metals)
  - high-mass stars (convective overshooting,
  .
  supernova progenitors, yield to ISM)
• 1 ages for Galactic stellar populations
• stellar evolution testbed
• properties of matter under extreme conditions
• Solar chronology in a stellar context

Eddington UK PPRP
Birmingham 10 Oct 2003
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Solar interior rotation
Slow surface rotation at poles
Shear at base of convection zone
Near solid body rotation of core
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Pulsating stars span the HR diagram
Eddington will allow to study all possible types
of pulsating stars
Eddington will measure stellar interior
structures across the entire HR diagram
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Inversion of simulated Eddington data for a 1.45
Msun star
Edge of convective core to within 1
Size of convective core determined within 1!
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Accuracy of stellar parameters
For an open cluster with moderate mass stars
(e.g. Hyades) with 1) classical observables
(UBV,parallax, Fe/H, etc)
. 2) frequency separations
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3) detailed inversion from observed frequencies
Eddington UK PPRP
Birmingham 10 Oct 2003
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Eddington Exoplanet Science
Discover and characterize a large number and
variety of extra-solar planets, including
habitable worlds.
Liquid water
Rocky, with atmosphere
Design to detect
habitable planets per star
Eddington UK PPRP
Birmingham 10 Oct 2003
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HST/FOS lightcurve of HD 209458 transit
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Mercury transiting the Sun 15 Nov 1999
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Design Goalto detect Earth analogs
Transit probability
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Eddington history
2000 - selected as an ESA Reserve mission 2002
- fully approved for 2008 launch ESA funds ( 200
Meuro) -- Spacecraft -- Herschel bus clone --
Payload (built by industry (Alcatel or Astrium)
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Eddington baseline payload

• Final definition ongoing!
• White light, wide field photometer
• Multiple (3x) telescopes
• Ca. 0.8 m2 collecting area
• Ca. 20 sq. deg field of view

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Eddington data products

• Long-term, highly accurate photometric light
  curves of selected targets in the field of view
• Up to 100,000 targets in PF field, 20,000 in AS
  fields
• 30 s time resolution in AS fields, 600 s time
  resolution in PF field
• Photon-noise limited

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Eddington baseline observing program

• 5 yr observational lifetime
• 3 yr uninterrupted planet-finding observation
• Asteroseismology also performed
• 2 yr total asteroseismic observations
• 1-3 months duration typical
• Planet-finding also performed
• Can be interleaved
• Both key science goals always on!
• Parallel and auxiliary science always ongoing

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Eddington, status

• Proposed in early 2000 to ESA as a
  flexy-mission (176 MEur envelope, 192 Meur 2003
  value)
• Selected as reserve mission in late 2000
• Approved in May 2002 as element of ESAs Cosmic
  Visions science program for launch early 2008
• Currently in a competitive definition phase
  (phase B) with two contractors
• Ready to start the implementation phase (phase
  C/D) in May 2004 for a 2008 launch

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Eddington development approach

• Complete mission is ESA-funded and developed
  under ESA responsibility
• S/C (Herschel bus clone)
• P/L (Built by industry)
• Launch
• Ground segment (including SOC)
• No dependence on external funding sources

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Eddington P/L Consortium

• Key scientific role, no H/W procurement
• Defines (together with Science Team) and oversees
  instrument specs and development
• Develops flight and ground science S/W
• Definition and execution of P/L calibration
• Proposal for P/L Consortium received, involves 41
  institutions in 11 countries

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Eddington Payload Consortium - organigram
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UK role in Payload Consortium - CCD
characterisation
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A community mission

• Fully open data policy
• No proprietary rights, data immediately available
  to complete ESA scientific community
• Fully open observing program
• 1-3 month fields program to be defined by
  community, through an AO cycle
• 3 yr field being currently being defined by
  Eddington community
• Ample space for additional science, additional
  targets

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Eddington low-risk approach

• S/C and P/L fully scoped (cost, schedule) by
  industry
• Scientific specs very tight and clear
• High level of definition
• High technological maturity
• No development items, no hidden surprises
• As a consequence, no financial risk

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Eddington vs Kepler

• 3 x 0.9m 2.3 sq.m
• 20 sq deg
• 3 colours
• L2 orbit

• 1 x 1.2m
• 100 sq deg
• white light
• drift-away orbit

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Kepler, status(from the Kepler web site)

• Systems requirements review Oct. 2003
• Preliminary design review Oct. 2004
• Critical design review Aug. 2005
• Launch Oct. 2007
• 60 flight CCDs to be procured (none delivered yet)