ObjetFiltresBinTemps PoseNombres PosesTemps Total
NomNgc 4236Luminance1 x 15 mn12910h75
ConstellationDragonRouge1 x 15 mn443h 66
Distance11.1 MALVert1 x 15 mn393h 25
Détail prise de vueBleu1 x 15 mn413h 41
LieuPerche et Cotes de Meuse
S21 x 1
Date acquisitionMars_Avril 20201 x 120 mn206h66
SetupO31 X 1
InstrumentSkyvision MTN 250Totaux27H74
Diamètre250 mmBias
Focale900 mmDark
Rapport F/D3,6Flat
MontureSkywatcher EQ8 Pierro AstroAcquisition faite parStéphane-Francis
Caméra acquisitionMoravian G2 4000Traitement fait parFrancis
Caméra de guidageStarlight-X Press Superstar
AtiK 314L
Logiciels utilisés
Montage de guidageDO SkymecaAcquisitionTheSkyX , Focusmax, Maxpilote
Echantillonage1,69 arc/sTraitementPixinsight, Photoshop


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.).


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DÉCLINAISON:+69°27′ 45s