Take the 2-minute tour ×  For the sub-nuclear physics there is a
database of the Particle Data Group, I was wondering if there
was a similar on-line collection for astrophysics, such as
energy absorption and emission spectra for different sources.
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accepted  There are a wide variety of databases covering all
sorts of data, and I won't try and list them all here (but I'll
list some of the largest ones). There isn't anything as clear-
cut as the Particle Data Group because astronomy deals with
complex systems (as opposed to the more fundamental particles in
sub-nuclear), and there's no saying that the spectrum of source
XX won't change tomorrow. Some sources are more transient than
others, and it's often possible to estimate a timescale for
transience, but there's always the possibility of some unknown
effect coming into play or some unresolved source entering the
region and wreaking havoc on the status quo.  I think the
closest thing to what you're as