| ACQUISITION | PARAMETRES ACQUISITION | |||||
| Objet | Filtres | Bin | Temps Pose | Nombres Poses | Temps Total | |
| Nom | NGC 4725 | Luminance | 1 x 1 | 180” | 39 | 1H95 |
| Constellation | Chevelure de Bérécine | Rouge | 1 x 1 | 180” | 42 | 2H10 |
| Distance | 55 Millions AL | Vert | 1 x 1 | 180” | 42 | 2H10 |
| Détail prise de vue | Bleu | 1 x 1 | 180” | 42 | 2H10 | |
| Lieu | Maison-Maugis Normandie | S2 | 1 x 1 | |||
| Date acquisition | 03/04/2022 au 10/04/2022 | Hα | 1 x 1 | |||
| Setup | O3 | 1 X 1 | ||||
| Instrument | Skyvision MTN 250 | Totaux | 162 | 8H10 | ||
| Diamètre | 250 mm | Bias | 1 X 1 | 99 | ||
| Focale | 900 mm | Dark | 1 X 1 | 51 | ||
| Rapport F/D | 3,6 | Flat | 1 X 1 | 11 | ||
| Monture | EQ8 Skywatcher | Acquisition faite par | Team Newastro | |||
| Caméra acquisition | ZWO Asi 6200 MM | Traitement fait par | Team Newastro | |||
| Caméra de guidage | Atik 314 L | Logiciels utilisés | ||||
| Montage de guidage | DO Skymeca | Acquisition | TheSkyX , Focusmax, Maxpilote | |||
| Echantillonage | 0.86 arcs | Traitement | Pixinsight, Photoshop | |||
COMMENTS ON THE SUBJECT :
NGC 4725 is an intermediate barred spiral galaxy with a prominent ring structure, located in the northern constellation of Coma Berenices near the galactic north pole. It was discovered by the German-born astronomer William Herschel on 6 April 1785. The galaxy is about 40 mega-light years away from the Milky Way.
NGC 4725 is the brightest member of the Coma I Group of the Coma-Sculptor Cloud, although it is relatively isolated from the other members of this group. This galaxy is highly perturbed and interacts with the neighbouring spiral galaxy NGC 4747, with its spiral arms showing signs of deformation. The pair has an angular separation of 24′ , which corresponds to a projected linear separation of 370 kly . A tidal plume extends from NGC 4747 towards NGC 4725.
ASCENSION DROITE:12h50’26,6s
DÉCLINAISON:+25°30′ 03s