What Variables can be Observed on Moonlit Nights?
Generally, red variables should not be observed if the Moon is above the horizon and between first and last quarter phase. Red variables include Miras, semiregulars, RV Tauri stars and slow irregular variables. R Coronae Borealis and Z Andromedae variables are also red but should be observed regardless of moonlight in order to spot any sudden changes in brightness. Novae and dwarf novae, x-ray variables, and eclipsing binaries can be observed regardless of moonlight. Cepheids (all types), S Doradus stars and young irregular (Orion-type) variables are preferably not observed during full moonlight.
