| ACQUISITION | PARAMETRES ACQUISITION | |||||
| Objet | Filtres | Bin | Temps Pose | Nombres Poses | Temps Total | |
| Nom | M81_M82 | Luminance | 1 x 1 | 5′ | 110 | 9H16 |
| Constellation | Grande Ourse | Rouge | 1 x 1 | 5′ | 38 | 3h16 |
| Distance | 12 Mal | Vert | 1 x 1 | 5′ | 39 | 3h25 |
| Détail prise de vue | Bleu | 1 x 1 | 5′ | 35 | 2h91 | |
| Lieu | Maison-Maugis 61 | S2 | ||||
| Date acquisition | 20/04/18 au 27/05/2018 | Hα | 1 x 1 | 20′ | 9 | 3h00 |
| Setup | O3 | |||||
| Instrument | Newton Skyvision Mtn 250 | Totaux | 168 | 21h50 | ||
| Diamètre | 250 mm | Bias | 99 | |||
| Focale | 900 mm | Dark | 19 | |||
| Rapport F/D | 3,6 | Flat | 11 | |||
| Monture | EQ8 Skywatcher | Acquisition faite par | Francis | |||
| Caméra acquisition | Morovian G2 4000 | Traitement fait par | Francis | |||
| Caméra de guidage | Lodestar-Atik 314L | Logiciels utilisés | ||||
| Montage de guidage | DO Skymeca | Acquisition | TheSkyX , Focusmax, Maxpilote | |||
| Echantillonage | 1,7 arcs | Traitement | Pixinsight, Photoshop | |||
COMMENTS ON THE OBJECT :
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.
AUTHOR’S COMMENTS :
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.
ASCENSION DROITE:09h55’33,2s
DECLINAISON:+69°03′ 55,1s