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Marietta College Colloquium

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Marietta College Department of Physics Colloquium (11/16/12)

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Marietta College Colloquium

  1. 1. Crowdsourcingthe Solar SystemCitizen Science with the Hubble SpaceTelescope Alex Viana, STScI Marietta College, 11/16/12
  2. 2. Intro
  3. 3. I work for (my formerthe boss)Hubble.
  4. 4. Our ProblemThere are ~10,000 archival solar systemimages observed with HSTs WFPC2.Their current science products are notoptimized for moving targets.We dont have a good catalog of whats inthese images.
  5. 5. Our ProjectCreate the high-quality science imagesoptimized for moving targets from everyWFPC2 solar system image.Create a catalog of every object in everyWFPC2 solar system image.
  6. 6. Our TeamMax Mutchler (STScI) - P.I.Dr. Susana Deusta (STScI)Dr. Alberto Conti (STScI)Alex Viana (STScI)Dr. Mike Wong (Berkeley/University ofMichigan)Dr. Pamela Gay (CosmoQuest, SIUE)+ CosmoQuest Team
  7. 7. Background
  8. 8. I work here
  9. 9. STScI:
  10. 10. What Does STScI Do?Hubble Space Telescope James Webb Space Telescope
  11. 11. The Hubble SpaceTelescope● Launched in 1990● ~90 min orbit● ~550 km● Serviced 5 times● Cameras: ○ WFC3 ○ STIS ○ COS ○ ACS ○ NICMOS ○ FGS
  12. 12. Wide-Field PlanetaryCamera 2In service from 1993 -2009.Observed 120 nm -1100 nm wavelengths.Now at National Airand Space Museum.
  13. 13. WFPC2 Images
  14. 14. Hubble’sWide Field 2 WFPC2:(WF2) both the camera and it’s Planetary Camera archival images are kinda weird (PC1) Archival mosaics are drizzled to WF pixel scale -- which means PC pixels are binned by 2X No rejection of cosmicWide Field 3 rays or detector artifacts(WF3) Wide Field 4 -- or worse, bad rejections! (WF4) Also -- what is on the WF chips? How many of the WF chips have never been inspected by anyone? *
  15. 15. Creating BetterImagesBlood from a Stone
  16. 16. Drizzling
  17. 17. Cosmic Ray Rejection
  18. 18. But solar system objects are "moving targets"They have moons, which can look like cosmicrays
  19. 19. *
  20. 20. *
  21. 21. Our science-ready images are mosaics which are clean, resampled, distortion-free,and include cataloged secondary objects and features, with planetary parametersembedded in their headers *
  22. 22. Our science-ready images are mosaics which are clean, resampled, distortion-free,and include cataloged secondary objects and features, with planetary parametersembedded in their headers *
  23. 23. Our science-ready images are mosaics which are clean, resampled, distortion-free,and include cataloged secondary objects and features, with planetary parametersembedded in their headers *
  24. 24. The standard calibration pipelines are not optimized for moving targets Single-image cosmic ray rejection: requires visual verification, iteration, and masking *
  25. 25. The standard calibration pipelines are not optimized for moving targets Single-image cosmic ray rejection: requires visual verification, iteration, and masking *
  26. 26. Creating aCatalogTagging the Solar Systems Facebook ...
  27. 27. *
  28. 28. PDS Rings Node “finder chart” *
  29. 29. In addition to providing finder charts for each observation, we’d like to actually catalogthe contents of each image -- what is actually detected (and what is the data quality)? *
  30. 30. Bring on theCitizenScientists!I get by with a little help from my friends
  31. 31. *
  32. 32. *
  33. 33. The SoftwareEasier said than done ...
  34. 34. For Every Image ...1. Run CR rejection2. Run astrodrizzle (x2)3. Create PNG (x2+)4. Get and convert metadata5. Talk to JPL Horizons via telnet6. Convert coordinates and find delta in pixels7. See if "pixels" fall on the image8. Save all the relevant information to a database2,200 lines of pure Python
  35. 35. Everything BecomesComplicated ...
  36. 36. Some Challenges10k+ files --> 100k+ filesHow do you know what version of your codegenerated what files?How do you know you code is working?How do you keep track of every moon in 80kdifferent images?
  37. 37. Life as aResearchAnalystYou have a bachelor of arts in math?
  38. 38. LinksProject: CosmoQuest.orgCode: github.com/acviana/MTPipeline/Alex:@AlexVianaProacviana.github.comviana@stsci.edu
  39. 39. AcknowledgementsThanks to the Marietta College Department ofPhysics for inviting me.Thanks Max Mutchler and Dr. Pamela Gay fortheir slides.This work is funded by STScI Hubble Cycle 18Legacy Archival Research proposal 12142
  40. 40. Question?Thanks so much for having me.

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