Resolution

The spatial resolution matters a lot when comparing images across wavelengths, or even just between telescopes.

Most coherent, developed, tested materials

• Resolution: Calibrating your expectations - what sizes do you expect to find in the sky and in images? -- Dr. Luisa Rebull (2020 but refined over nearly 10 years)

• Resolution Overview -- Dr. Luisa Rebull (created 2010, last substantially updated 2017)
• Resolution and YSOs, examples and exercises (used to be integrated with the overview above) -- Dr. Luisa Rebull (created 2010, last substantially updated 2017)

Less coherent, developed, tested materials

Questions to think about and things to try having to do with resolution

• What is the size of a typical HST image? How does it compare to a single Spitzer image, or a 'typical' Spitzer mosaic, or a single POSS plate, or the field of view of an optical telescope you have used, all compared with the size of the full moon? How does that compare to the size of a recent comet that visited the inner Solar System? or the size of a spiral arm of the Milky Way? You will have to go find on the web things like the field of view of these telescopes and these objects.
• Can you create a 3-color mosaic using just Spitzer data where the different resolutions of the various cameras is noticeable and important?
• How does the spatial resolution of all those telescopes listed above compare? (e.g., what is the smallest object you can resolve as more than a point source?)
• Are you going to laugh out loud the next time you're watching a crime drama, and someone says, "can you enhance that?" when referring to a blurry black-and-white image from a security camera, and someone else waves a magic wand and suddenly all sorts of small details are visible? (Can I wave my magic wand over that DIRBE image above and ever get that Spitzer/IRAC image?)

• Resolution worksheets developed by Dr. Luisa Rebull. You can see evolution in how I'm explaining things with time. More recent versions are more tested (and have more things broken out into different documents).
  • 2020 - still in Word, now broken into 3 pieces, and modified more (due to mostly pandemic but also the way this group wanted to work): File:Resolution2020-part1.pdf and File:Resolution2020-part2.pdf and File:Resolution2020-part3.pdf
  • 2019 - I moved to Word and broke it into two pieces, one of which is more "how to view fits images" and the other is more the resolution work: File:Resolution2019-part1.pdf and File:Resolution2019-part2.pdf
  • L1688 Resolution Worksheet - developed in 2018 for the L1688 team
  • CephC-LABS Resolution Worksheet - developed in 2017 for the CephC-LABS team
  • LLAMMa Resolution Worksheet - developed in 2016 for the LLAMMa team
  • IC 417 Resolution Worksheet - developed in 2015 for the IC417 team
  • HG-WELS Resolution Worksheet - developed in 2014 for the HG-WELS team
  • C-CWEL Resolution Worksheet - developed in 2013 for the C-CWEL team
  • C-WAYS Resolution Worksheet - developed in 2012 for the C-WAYS team

Useful Related Links

Article on resolution from Bad Astronomy - this is in the context of debunking the moon hoax, but resolution issues are important for his discussion.

Another resolution discussion from Bad Astronomy.

Why can Hubble get detailed views of distant galaxies but not of Pluto? by Emily Lakdawalla at the Planetary Society

xkcd on angular size (link is actually to the explainer, which has more information than just the comic.)