Sharpless 91

Sharpless 91

Commentaires sur l’objet photographié

outters-nicolasCette image a été faite avec la lunette TEC140 et des poses unitaires de 30 mn.

L’objet choisi est une idée de Sakib Rasool qui me l’a mis dans sa liste des objets à faire. Sh2-91 est la partie la plus brillante d’un rémanent de supernovae qui est immense et cette image n’est qu’une toute petite partie.

J’ai choisi les filtre Ha, OIII et SII en raison de la nature de l’objet et de la rareté de l’image.

Image SHO

Image Ha

Image OIII

Données techniques

Données techniques de prise de vue

Object :Sh2-91
Date : images du 09/06/2016 au 08/07/2016
Optics :Tec140 F7
Mount : Paramount ME Numéro 2
Location : Orange observatory
Seeing : fwhm de 2.45 à 3.76
Ccd : Proline 16803
filter wheel :FLI
filters : Astrodon
SIIHaOIII
Focuser :Robofocus
Guiding : Atik 314L+
Temp. out : 20°
Temp ccd : -30
Total exposure :  32,5 h
tout en binning 1×1
16 x 30′ s2 en rouge

30 x 30′ Ha en vert
19 x 30′ o3 en bleu

6 x 5′ pour chaque filtre R V B

Données scientifiques

observational data
( Epoch J2000 )
Constellation Swan
right ascension 19 h 39 m: [1]
Declination + 29 ° 57 ‘: [1]
galactic coordinates l = 64.8; b = +03.9 [1]
Distance 2600 to [2] [3]
(800 pc ) [2] [3]
Apparent magnitude (V) –
Apparent size (V) 120 ‘x 20’
Physical characteristics
Type Supernova rest
Class 3 3 2 [4]
dimensions 102.4 to
(31.4 pc )
Outstanding features part of G65.2 + 5.7
other designations
LBN 147 [1]

Sh2 -91 is a faint emission nebula visible in the constellation of Cygnus .

The cloud is identified about 1 ° north of the famous optical double Albireo , a star of the third magnitude visible even from urban centers; Despite its vast size, Sh2-91 is very weak and his observation is extremely difficult, as well as its shooting, which can be made through the use of special filters. The best time for your observation in the evening sky from June to December, especially from the boreal regions.

Sh2-91 is the southern strand and most extensive of the supernova remnant G65.2 + 5.7 , located about 800 parsecs (2,600 light years ) from the Solar System in a galactic region rich in dense molecular clouds , on which stands the great Fissure of swan ; G65.2 + 5.7 is in fact a super-bubble extended for about 180 parsecs and placed 80 parsecs north of the galactic plane . [3] Sh2-91 shows a strong bias , indicates the presence of a strong magnetic field