| ACQUISITION | PARAMETRES ACQUISITION | |||||
| Objet | Filtres | Bin | Temps Pose | Nombres Poses | Temps Total | |
| Nom | Ngc 4725-Lotr5 | Luminance | 1 x 1 | 5′ | 105 | 8h75 |
| Constellation | Chevelure de Bérénice | Rouge | 1 x 1 | 5′ | 33 | 2h75 |
| Distance | 41MAL-1650 AL | Vert | 1 x 1 | 5′ | 32 | 2h66 |
| Détail prise de vue | Bleu | 1 x 1 | 5′ | 29 | 2h50 | |
| Lieu | Cotes de Meuse | S2 | 1 x 1 | |||
| Date acquisition | Du 15/04/20 au 26/06/20 | Hα | 1 x 1 | 20′ | 11 | 3h66 |
| Setup | O3 | 1 X 1 | 20′ | 35 | 11h66 | |
| Instrument | Takahashi FSQ 106 ED | Totaux | 32H00 | |||
| Diamètre | 106 mm | Bias | 99 | |||
| Focale | 530 mm | Dark | 31 | |||
| Rapport F/D | 5 | Flat | 15 | |||
| Monture | Skywatcher AZ EQ6 Pierro Astro | Acquisition faite par | Stéphane | |||
| Caméra acquisition | ASI 1600 MM Cooled | Traitement fait par | Francis | |||
| Caméra de guidage | Starlight-X Press Superstar | Logiciels utilisés | ||||
| Montage de guidage | DO Skymeca | Acquisition | TheSkyX , Focusmax, Maxpilote | |||
| Echantillonage | 1,48 arc/s | Traitement | Pixinsight, Photoshop | |||
PHOTO COMMENTS
NGC 4725 is a barred spiral galaxy of apparent magnitude 9.20, located about 41 million light-years from Earth in the direction of the Berenice Hair constellation. When we look closely at this galaxy, we notice that it has only one spiral arm. Most galaxies, such as the Milky Way, are composed of two or more spiral arms revolving around a central nucleus.NGC 4725 belongs to the category of “Seyfert galaxies”. Seyfert galaxies are active galaxies, spiral or irregular, containing an extremely bright nucleus. This name was given to them in homage to Carl Seyfert, an American astronomer who studied these objects during the 1940s.
Slightly to the left of Ngc 4725, an elongated galaxy Ngc 4747 located 45 million light years away.
Slightly to the right very small, seen almost by the slice Ngc 4712 at a distance almost five times more distant of 200 million light-years, its diameter is 135000 light-years.
Completely on the left is the LoTr 5 planetary nebula discovered in 1980, located 1650 light-years away.
ASCENSION DROITE:12h50’26.6s
DÉCLINAISON:+25°30′ 03s