The Ursa Major Triplet with IFN

25,002.500,00 (IVA tax inc.)


M81, M82 and NGC 3077 galaxies lay some 12 million light-years away from Earth in the constellation of the Great Bear (Ursa Major). The triplet are strongly interacting with each other. Observations of the 21-centimeter hydrogen line suggest that this gravitational link exists among them.

Integrated Flux Nebula (IFN) can be seen around the galaxies. This faint glow is caused by the combined light of the stars of the Milky Way reflected and re-emitted by interestellar gas and dust.

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​ HD image.

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Image Details

L: 107×300″

RGB: 20×180″ each channel


All images at 0Gain -20ºC bin1

Calibrated with 30 flats, 30 darks, 50 bias


Total exposure:  11h55’


Average darkness: 20.80 mag/arcsec2

Image resolution: 1.74”/pixel


FSQ85ED telescope

Mesu200 mount

ASI1600MM Pro camera with ZWO EFW 8 pos

Guiding with ASI174MC and ZWO OAG

Baader filters



Aleix Roig – Prades, Tarragona (Catalonia, Spain), February 2021.

Additional information

Image use

Non-commercial use, Commercial Use