1. All Sky Infrared Telescope, AKARI (ASTRO-F)
Hyung Mok Lee (Seoul National University)
and
AKARI Team

2. OUTLINE
Overview: Telescope, Focal Plane Instruments, Orbit and Observing Modes
Uniqueness
Current Status: Launch, Attitude and Orbit Control System, Cryogenics, Detectors of Far Infrared Surveyor, Schedule
Science Programs: Large Area Surveys, Mission Programs, Open Time Programs
February 21, 2007
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3. OVERVIEW
Illustration in Newton Magazine

4. The Project
Primary Institute: Japan Aerospace Exploration Institutes (JAXA)/Institute for Space and Aeronautical Science (ISAS)
Collaborative Institutes in Japan:
- University of Tokyo
- Nagoya University
- Communications Research lab.
- National Astronomical Observatory (NAOJ)
International Collaboration
- Seoul National University (Pre- and post-flight simulations/data reduction)
- ESA (Pointing reconstruction)
- European Consortium (Imperial, Open Univ., Groningen: data reduction)
February 21, 2007
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5. Telescope Cryogenic System Mirror 170 liter LHe + Stirling Cooler
68 cm, F/6
SiC
1" Quality
Cryogenic System
170 liter LHe + Stirling Cooler
T(tel) < 6 K,
T(detector) = 1.8 K (st. Ge:Ga), 15 K (InSb)
February 21, 2007
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6. Focal Plane Instruments
IRC: Near- and Mid-IR Camera
FIS: Far-IR Surveyor
February 21, 2007
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7. Orbit and Observing Modes
Sun Syncrhonous Orbit with a= km e=  
Altitude ~ 750 km
Orbital Period ~100 minutes
Max Pointings / revol.
Pointing Obs.
< 10 min per pointing
February 21, 2007
APCTP2007

8. Simulated image at FIR by Jeong, W.
UNIQUENESS
Simulated image at FIR by Jeong, W.

9. Features All sky survey in mid to far infrared
Higher sensitivity and resolution compared to IRAS (e.g., ’ compared to 6’ at far IR)
Wide field of view compared to Spitzer for near and mid infrared imagers (10’ x 10’ compared to 5’ x 5’)
Wide and continuous wavelength coverage from near to far IR (2-170 microns, Spitzer has MIR gap)
Wide field spectroscopic capability in far IR.
Nearly continuous spectroscopic coverage from near to Far-IR.
February 21, 2007
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10. AKARI Sensitivity Spitzer cannot cover this range February 21, 2007
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11. Large survey volume
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12. CURRENT STATUS
Lift off on Feb. 21, 2006, 21:28 UT

13. Launch and Orbit Launch February 21, 2006 21:28 UT Initial Orbit:
- apogee: 750 km
- perigee: 180 km
- inclination angle ~98 deg.
Boost orbit operation has been successful
- Current orbit has e=0.002 with altitude of ~750 km
February 21, 2007
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14. February 21, 2007
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15. First Stage Separation at 75 sec.
February 21, 2007
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16. Cryogenics Major Operations Vent valve open: 230sec after the launch
Mechanical Cryocooler Operation
Summary
- Cryogenic system is operating as expected
- But the delay of APLD Jettison may shorten the observations slightly (~550 days was the original plan )
February 21, 2007
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17. Schedule
Aperture Lid Open: April 13, 2006 (delayed by more than one month)
Survey started in early May, 2006
Phase 1: First 6 months of observations: devoted to all sky survey (until early November)
Phase 2: Remainder of the lifetime (sometime late August?) Mostly pointed observations for Mission Programs, and open time programs.
February 21, 2007
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18. SCIENCE PROGRAMS
Stephan’s Quintet, a nearby cluster, seen by Spitzer Telescope

19. All Sky Survey Four bands in Far-IR: 65, 90, 140, 160 mm
Two bands in Mid-IR: 9, 20 mm
Sky coverage ~ 90% with more than 2 scans
Data Products:
- Point Source Catalogues:
(1) flux catalogue of IRAS sources
(2) Bright Source Catalogue
(3) Faint Source Catalogue, etc
Other possible products:
Advanced Faint Source Catalogue, Extended Source Images, etc
AKARI
IRAS
February 21, 2007
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20. NEP Survey
The nature of sun-synchronous orbit allows very deep surveys in NEP and SEP regions.
NEP survey is intended to study the dusty star formation history, mass assembly and large structure evolution of the universe to high redshifts (up to z~4)
NEP survey consists of 0.5 sq. deg. deep survey (nearly confusion limited) and wide area (6.2 sq. deg.) shallow survey
It will be supplemented by the spectroscopic survey Mission Program.
February 21, 2007
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21. NEP Survey Area Green: Wide Pink: Deep Yellow: CFHT Optical Survey
February 21, 2007
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22. SEP Survey
LMC is located near SEP, and most part (15 sqaure degree) of the LMC will be covered by this survey
Study star forming regions, supernova remnants, evolved stars, and interstellar medium
Data product:
- Point source catalogue
- Faint source catalogue
- Mosaic images
- Spectroscopic data
February 21, 2007
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23. SEP Survey Area Five filter bands Near IR Prism 866 Pointings
February 21, 2007
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24. Mission Programs Legacy programs of AKARI organized by working groups.
Covers wide areas of astronomy
- Solar System Objects, including Zodiacal dusts
- Stars
- ISM, Star Forming Regions
- Nearby galaxies
- Distant galaxies and blank fields
Total Pointings >2200 (including the NEP and SEP surveys)
One pointing can be used up to 10 minutes integration
February 21, 2007
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25. Open Time Observations
Total ~1100 pointing opportunities
500 reserved for European communities
600 for Japanese and Korean astronomers.
Program for individual researchers
February 21, 2007
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26. Sample Images from Press Releases

27. Mid-IR all sky survey AKARI 9 mm IRAS 12 mm February 21, 2007
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28. Reflection Nebula IC 4954
February 21, 2007
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29. Spiral Galaxy M81
February 21, 2007
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30. Largest Reflection Nebula IC1396
2 deg x 2 deg
February 21, 2007
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31. Dust around a star
February 21, 2007
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32. LMC
February 21, 2007
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33. Color
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34. SUMMARY AKARI is performing all sky survey now
Capable of mapping large areas with better sensitivity, higher resolution and wider/continuous wavelength coverage from near to far infrared than previous missions
Complementary to Spitzer in mid-IR imaging, in addition to the all sky survey which is unique to AKARI.
Initial results papers are being written now and will be published by the end of summer this year.
A series of point source catalogues will be released soon after the completion of the mission.
They will be basic catalogues for upcoming large aperture IR space telescopes (Herschel, JWST, SPICA)
February 21, 2007
APCTP2007