|Objet||Filtres||Bin||Temps Pose||Nombres Poses||Temps Total|
|Nom||Barnard 33||Luminance||1 x 1|
|Constellation||Orion||Rouge G75 O15||1 x 1||150”||73||3.2 H|
|Distance||1500 AL||Vert G75 O15||1 x 1||120”||92||3.4 H|
|Détail prise de vue||Bleu G75 O15||1 x 1||120”||94||3.6 H|
|Lieu||Ameiria Portugal||S2 G200 O60||1 x 1|
|Date acquisition||30/12/20 au 15/03/21||Hα G200 O60||1 x 1||180”||201||10.3 H|
|Setup||O3 G200 O60||1 x 1|
|Diamètre||106 mm||Bias||1 x 1||99|
|Focale||530 mm||Dark||1 x 1||51|
|Rapport F/D||5||Flat||1 x 1||11|
|Monture||EQ6 Pro Skywatcher||Acquisition faite par||Team ARO|
|Caméra acquisition||ZWO Asi 1600 MM||Traitement fait par||Team ARO|
|Caméra de guidage||Lodestar X2||Logiciels utilisés|
|Montage de guidage||DO Starlight X press||Acquisition||TheSkyX , Focusmax, Maxpilote|
|Echantillonage||1,48 arcs||Traitement||Pixinsight, Photoshop|
COMMENTS BY THE AUTHORS:
This image of Barnard 33, is our third shot, on our Portuguese site. We prefer to have a large number of hours of acquisition, in order to obtain a high quality image, rather than a large number of objects.
This is still the case for this photo, which is very rich in signal, due to the exceptional quality of the site.
We take great pleasure in processing these photos, where we have exploited all the signal that our camera has captured.
COMMENTS ON THE PHOTO:
One of the most recognisable nebulae in the sky, the Orion Horsehead Nebula, is part of a large, dark molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow comes from the hydrogen gas mainly behind the nebula, ionised by the nearby bright star Sigma Orionis .
Slightly below, to the left of the horse’s head, is the blue reflection nebula NGC 2023. The darkness of the Horsehead is mainly caused by thick dust. The gas streams leaving the nebula are channelled by a strong magnetic field. Light takes about 1500 years to reach us from the Horsehead Nebula.
Below Ngc 2023 we find the tiny reflection nebula Ic 435.
Further to the left is the Flame Nebula, which extends over about 12 light years. The nebula is energised by Alnitak (Zeta Orionis), the easternmost bright star in Orion’s belt. The intense ultraviolet radiation from this blue supergiant ionises the hydrogen atoms in the nebula. The ions thus created emit a red glow when they capture a free electron.
Gas and especially dust in front of NGC 2024 absorb the light from the nebula and form the dark ribbon seen in the visible light images.
To the left of the Flame Nebula we find Ic 432 and Ic 431, two reflection nebulae.