ARP 84 (Mathieu Guinot)

ARP 84

L'objet ARP 84, également nommé "galaxie du Héron", est constitué de deux galaxies en interaction gravitationnelle, NGC5394 et NGC5395, situées à environ 160 millions d'années-lumière dans la constellation des Chiens de Chasse.

Le disque principal de NGC 5395 est asymétrique et déformé en raison de l'interaction avec son compagnon proche NGC 5394. Le bras spiral dominant de cette galaxie spirale à deux bras forme un grand anneau quelque peu décentré par rapport au noyau. Des voies de poussière obscurcissantes peuvent être observées dans toute la galaxie.

La plus petite galaxie, NGC 5394, a un disque ovale, deux grands bras de marée ouverts, assez symétriques, et des bras spiraux intérieurs très brillants, disjoints des bras de marée extérieurs.

(Robert Cazilhac, 2000).

Ce couple très peu imagé a une taille apparente assez petite, et comme bon nombre des objets du catalogue Arp il est splendide et c'est un vrai bonheur d'avoir pu le photographier!

L'Atlas of Peculiar Galaxies, aussi appelé communément atlas Arp, est un catalogue astronomique produit par l'astronome Halton Arp et recensant 338 galaxies particulières, publié en 1966.

Le but principal du catalogue était de réunir des exemples de photographies de structures particulières parmi les galaxies proches de la nôtre. Arp réalisa que la raison pour laquelle certaines galaxies sont de formes spirale ou elliptique n'était pas claire. Il voyait les galaxies particulières comme de petites « expériences » permettant aux astronomes de comprendre les phénomènes physiques menant à la déformation de certaines galaxies spirales ou elliptique. En recensant ces dernières dans un atlas, il permettait à ses collègues d'étudier plus en détail ces phénomènes. (wiki)

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Status	Advanced success
Started	...
Astrometry.net job	5441809
PixInsight job	A2MLAO35X9JB9P9SXSN72T450Y3K2960
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h58m27s.430
RA (top/left)	13h59m11s.998
RA (top/right)	13h59m24s.477
RA (bottom/right)	13h57m42s.638
RA (bottom/left)	13h57m30s.730

Dec (center)	+37°27′01″.73
Dec (top/left)	+37°11′53″.67
Dec (top/right)	+37°40′26″.39
Dec (bottom/right)	+37°42′08″.99
Dec (bottom/left)	+37°13′35″.21

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