M 81 M 82

ObjetFiltresBinTemps PoseNombres PosesTemps Total
NomM81_M82Luminance1 x 15′1109H16
ConstellationGrande OurseRouge1 x 15′383h16
Distance12 Mal Vert1 x 15′393h25
Détail prise de vueBleu1 x 15′352h91
LieuMaison-Maugis 61
Date acquisition20/04/18 au 27/05/20181 x 120′93h00
InstrumentNewton Skyvision Mtn 250Totaux16821h50
Diamètre250 mmBias99
Focale900 mmDark19
Rapport F/D3,6Flat11
MontureEQ8 SkywatcherAcquisition faite parFrancis
Caméra acquisitionMorovian G2 4000Traitement fait parFrancis
Caméra de guidageLodestar-Atik 314LLogiciels utilisés
Montage de guidageDO SkymecaAcquisitionTheSkyX , Focusmax, Maxpilote
Echantillonage1,7 arcsTraitementPixinsight, Photoshop


Discovered by Johann Elert BODE in 1774, this duo of galaxies is located in the constellation of the Big Dipper and is 11 million light years away from the solar system, making them the closest galaxies to our own.
M 81 is a barred spiral galaxy of small diameter with only 60,000 AL that appears from 3⁄4 face, its magnitude is 6.9 for an apparent diameter of 26.9′ X 14.1′ (arc minutes). M 82, also called the Cigar Galaxy, is an irregular type of galaxy, seen practically from the side. Its nucleus seems to have been deformed by the presence of M81 in its close vicinity and it presents dark lines. As for its magnitude, it is 8.4 for an apparent diameter of 9′ X 4′ (minutes of arc). Finally, it is located 45′ north of M 81.


The purpose of this acquisition was to reveal the barely visible dust, which is essentially in the right part of the image. This very faint reflection nebula, actually resides in a large part of the sky from the North Pole to the Big Dipper: it is the Integrated Flux Nebula called IFN.

It is well highlighted on the picture, and the processing was thus decomposed into three parts, the sky background, M 81 and M 82.

We can also see very well on M82 also called Cigar Galaxy, the gravitational effects generated by M 81.

I am satisfied with this picture, too bad that the field with my sensor is a little bit too narrow, which would have enriched the quality of this picture significantly.

It will be necessary to “reshoot” M 81 alone later.


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DECLINAISON:+69°03′ 55,1s