session 1 - working with hst data
DESCRIPTION
Where to find raw data acquired by the Hubble Space Telescope.TRANSCRIPT
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Where to find ideas ?● Astronomy picture of the day● NASA, Hubble section● NASA, hubblesite.org● ESA, spacetelescope.org● Wikipedia
○ galaxy○ planetary nebula○ astronomy portal
● Twitter, lots of people to follow: NASA, ESA, ESO, big labs in the US, CERN etc …
● News.Ex: The Atlantic● Radio: CBC
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Astronomy Picture of the day
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NASA, Hubble section
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NASA, Hubblesite.org
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ESA, spacetelescope.org
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Wikipedia, galaxy
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Wikipedia, planetary nebula
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Wikipedia, astronomy portal
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News - ex: the atlantic
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Radio : CBC
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Where to get the data from ?
● Hubble Legacy Archive● MAST
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HLA- search interface● Simple interface: simple but maybe too simple ?
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HLA : the most important thing : help !
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HLA help center : FAQ
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HLA search - Inventory tab
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HLA search - Images tab
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HLA search - Interactive display
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HLA search - Footprint tab
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HLA - advanced search interface
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HLA - Advanced Search - Data Products
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Data Products : what are these things ?
From the help center:
What are the data product levels? What does "Best Available" mean?There are several levels of data in the HLA:
● Level 1 data are the individual exposures, projected ("drizzled") onto a common frame for each visit.● Level 2 data are the combined images (exposures with the same filter, same camera, and within the same visit).● Level 3 images are deep combined images or mosaics creating by combining data taken in different visits to the target.● Level 4 data are false color images (a combination of two or three colors, depending on what is available). They are
included with other selections to help users assess data quality.● Level 5 data are the community-contributed high-level science products (HLSP).● Level 0 (calibrated, unprocessed) are not available for direct searches but may often by found using the More... link.
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Instruments overview
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Instruments details
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HST - list of filters● WFPC2 optical filters● WFC3 filters
Why does that matter ?
Astronomy cameras don’t take pictures in color. They combine 3 (Red, Green, Blue - RGB) or 4 (Luminance, Red, Green, Blue - LRGB) black and white pictures taken with one specific filter to make one color picture
wikipedia - visible spectrum
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Filters … filters ...filters● Why so many filters then ?
○ Specific filters can be used to see a specific process
Sun - SOHO. Credit NASA Sun, Hydrogen Alpha filter