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Catalogue and alternative designations NGC 2261, Hubble's variable nebula


Type Reflection Nebula 
Position 6 39 10, +8 45
Constellation Monoceros
Camera and Telescope STXL6303 and 36.8 cmRitchey Chretien
Focal Ratio F9
Exposure Details LRGB 60, 50,35, 60 all unbinned using Astrodon filters 
Description NGC 2261 which is also known as Hubble's variable nebula is an interesting reflection nebula discovered by Herschel in 1783. It was extensively studied by Hubble because of its variable nature which is caused by shadowing from the variable star R Monocerotis. NGC 2261 was the first light object for the 200 inch reflector at Mt Palomar