What instruments do amateur astronomers use in their ground based telescopes in order to avoid atmospheric absorption/telluric contamination? For example, when an astronomer observes a celestial body like a distant star or an object, what do they do in their spectrometer to avoid telluric contamination (atmospheric absorption of wavelengths), as space telescopes have a great advantage in it? Because the atmospheric humidity is variable and that may affect the telluric absorption, so how do the telluric correction softwares like ISIS (Thanks, EdV!) cope up with the variable humidity?.

Thanks in advance!

  • $\begingroup$ Please read the last paragraph in the response here: groups.io/g/RSpec-Astronomy/message/…. Basically, the telluric lines are known/tabulated and compensation can be performed. $\endgroup$
    – Ed V
    Sep 8 at 14:19
  • $\begingroup$ @EdV Thanks a lot!, " Telluric lines can easily be identified from standard Telluric catalogues and even removed if necessary using templates in programs such as ISIS but they are all at the red end from NaD lines upwards and are not found in the regions traditionally used for spectra classification." was very insightful!. So amateur astronomers identify the telluric contamination and then analyze the spectral data, and minus out the data from the catalogue? $\endgroup$
    – Arjun
    Sep 8 at 14:37
  • 1
    $\begingroup$ Yes. There are lots of example of stellar spectra at the linked site and a great deal of useful information. The person who posted the answer there is an actual expert amateur who is very knowledgeable and helpful when people have questions. I am just a member there and likely the only one with no telescope! But I do spectroscopy, like this: astronomy.stackexchange.com/a/49116/45954. $\endgroup$
    – Ed V
    Sep 8 at 15:36
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    $\begingroup$ @EdV Thanks a lot, it solved almost all of my doubts!. $\endgroup$
    – Arjun
    Sep 8 at 15:44
  • $\begingroup$ @EdV detected any telluric tellurium lines yet? :-) (strictly humor) $\endgroup$
    – uhoh
    Sep 10 at 2:45


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