Triangle de Pickering

ObjetFiltresBinTemps PoseNombres PosesTemps Total
NomTriangle de PickeringLuminance1 x 1
ConstellationCygneRouge1 x 160s120h20
Distance1440 alVert1 x 160s120h20
Détail prise de vueBleu1 x 160s120h20
LieuMaison-Maugis 61
Appremont 55
S21 x 11200s165h33
Date acquisition05/08/18 au 30/08/20191 x 11200s6722h33
SetupO31 x 11200s4314h33
InstrumentNewton Skyvision Mtn 250Totaux16242 hrs60
Diamètre250 mmBias99
Focale900 mmDark19
Rapport F/D3,6Flat11
MontureEQ8 SkywatcherAcquisition faite parStephane-Francis
Caméra acquisitionMorovian G2 4000Traitement fait parFrancis
Caméra de guidageLodestar-Atik 314LLogiciels utilisés
Montage de guidageDO SkymecaAcquisitionTheSkyX – Software Bisque, Focusmax, Maxpilote
Echantillonage1,7 arcsTraitementPixinsight, Photoshop


Chaotic in appearance, these filaments of shocked gas visible in the Earth’s sky towards the constellation Swan form the western part of the Veil Nebula. Taken as a whole, the Veil Nebula is all that remains of a massive Milky Way star. More than 5000 years ago, this star exploded as a supernova. The shock wave then began to propagate through the interstellar medium, pushing ahead of it and ionizing the matter encountered along the way. These filaments are a bit like the ripples that form on the surface of a pond when the fall of a stone clouds its surface. The intense radiation from the supernova has also ionized the atoms that make up the interstellar material, with hydrogen emitting red, sulphur green and oxygen blue when they recover their electrons. At that time, the expanding cloud was certainly as bright as a crescent moon, and remained visible for several weeks. Also known as the Swan’s Loop, the Veil Nebula now extends from one end to the other over an apparent field of 3°, the equivalent of 6 full moons. This translates into a diameter of 70 light-years at the estimated distance of 1500 light-years from Earth. This image covers only one third of this field. Known as the Pickering Triangle in the tradition that the honours of discovery should go to the director of the observatory, this triangular complex of filaments should in all fairness be known as Fleming’s Volutes, after Williamina Fleming, the woman who actually discovered it on a photographic plate.

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DECLINAISON:+30°41′ 0s