| ACQUISITION | PARAMETRES ACQUISITION | |||||
| Objet | Filtres | Bin | Temps Pose | Nombres Poses | Temps Total | |
| Nom | Ngc 4236 | Luminance | 1 x 1 | 5 mn | 129 | 10h75 |
| Constellation | Dragon | Rouge | 1 x 1 | 5 mn | 44 | 3h 66 |
| Distance | 11.1 MAL | Vert | 1 x 1 | 5 mn | 39 | 3h 25 |
| Détail prise de vue | Bleu | 1 x 1 | 5 mn | 41 | 3h 41 | |
| Lieu | Perche et Cotes de Meuse | S2 | 1 x 1 | |||
| Date acquisition | Mars_Avril 2020 | Hα | 1 x 1 | 20 mn | 20 | 6h66 |
| Setup | O3 | 1 X 1 | ||||
| Instrument | Skyvision MTN 250 | Totaux | 27H74 | |||
| Diamètre | 250 mm | Bias | ||||
| Focale | 900 mm | Dark | ||||
| Rapport F/D | 3,6 | Flat | ||||
| Monture | Skywatcher EQ8 Pierro Astro | Acquisition faite par | Stéphane-Francis | |||
| Caméra acquisition | Moravian G2 4000 | Traitement fait par | Francis | |||
| Caméra de guidage | Starlight-X Press Superstar AtiK 314L | Logiciels utilisés | ||||
| Montage de guidage | DO Skymeca | Acquisition | TheSkyX , Focusmax, Maxpilote | |||
| Echantillonage | 1,69 arc/s | Traitement | Pixinsight, Photoshop | |||
PHOTO COMMENTS
NGC 4236 (also known as Caldwell 3) is a magellanic-type barred spiral galaxy seen from the slice and located in the constellation of the Dragon about 11.1 million light years from the Milky Way. It was discovered by the German-British astronomer William Herschel in 1793.
The brightness class of NGC 4236 is IV-V and it has a wide HI line. With a value of 15.09 mag/as2, NGC 4236 is a galaxy with low surface brightness.
The NASA/IPAC database indicates that NGC 4236 is a field galaxy, i.e. it does not belong to a cluster or group and is therefore gravitationally isolated. Two other sources indicate that it is part of the M81 group.
This galaxy is too close to the local group and Hubble’s Law cannot be used to calculate its distance since its radial velocity is zero. Fortunately, more than 20 non-red shift (redshift) measurements have been made. These measurements give an average distance of 3.393 ± 1.251 Mpc(∼11,1 million a.l.).
ASCENSION DROITE:12h16’42.1s
DÉCLINAISON:+69°27′ 45s