Stars are included out to 675 light-years, beyond which distances start becoming too uncertain to plot, and down to visual magnitude 4.8, though the very faintest may not be displayed.
Notes are given for all stars with known planets (as of 2016); others are slowly being added over time. These are mostly based on the following, with additional references given as needed:
The ‘earth-like zones’ are quick estimates of where total radiation is similar. These ignore effects from size, variations, and companions, but should be good enough for basic comparisons of stars or planets.
If you have any corrections or suggestions on how this could be made more useful to you, I would be happy to hear from you.
Josh Grosse – Contact