1. Astroquery keywords: https://github.com/astropy/astroquery/blob/master/astroquery/simbad/data/votable_fields_dict.json
2. Vizier SED: http://vizier.u-strasbg.fr/vizier/sed/
3. Download papers outside JHU: add ".proxy1.library.jhu.edu" at the end domain of the paper link (from here).
Access papers outside Caltech: add "https://clsproxy.library.caltech.edu/login?url=" before the paper link.
4. Digitalize data from figure: https://apps.automeris.io/wpd/
Digitalize image with colorbar: http://www.graphreader.com/2dreader
5. Quick Links:
Error propagation: https://www.eoas.ubc.ca/courses/eosc252/error-propagation-calculator-fj.htm
Absolute and apparent magnitude: https://www.omnicalculator.com/physics/luminosity http://www.1728.org/magntudj.htm
Orbital period: https://www.omnicalculator.com/physics/orbital-velocity or http://www.calctool.org/CALC/phys/astronomy/planet_orbit
Duration between dates: https://www.timeanddate.com/date/duration.html
6. Energy / Flux Density unit conversion:
https://hea-www.harvard.edu/~pgreen/figs/Conversions.pdf
7. Magnitude to Jansky:
https://irsa.ipac.caltech.edu/data/SPITZER/docs/dataanalysistools/tools/pet/magtojy/
8. ESO timeline (OPC)