•Initially just a type of
nebula
•Hubble resolved stars in
M31 (1920s)
•Many mixed catalogs already
existed
–Messier (M –
“fuzzy non-comets”), 39 of 109
–New General Catalog (NGC),
3200 of 7840
•Today there are many
surveys/catalogs (see NED entries while doing homework)
–SDSS and 2dF (more later
this semester)