NGC 1300 : "a spiral within a spiral" (JB Auroux)

NGC 1300 : "a spiral within a spiral"

NGC 1300 is a large, barred spiral galaxy in the constellation Eridanus, around 69 million light-years away (many redshift measurements suggest a smaller distance, of the order of 45 million light-years).

Depending on its actual distance, its size is estimated at between 110,000 and 183,000 LY in diameter.

Its distinctive characteristic is, of course, its very long central bar. Photographs taken by the Hubble Space Telescope show that the core of NGC 1300 has an extraordinary and distinctive structure, with an inner spiral that stretches for around 3,000 light-years.

It seems that only galaxies with a long central bar appear to have an inner disc with a spiral structure: kind of a "spiral within a spiral"...

This image was processed in 2x drizzle and then reduced to 50% after processing, to preserve as much detail as possible.

Acquired by Aziz Kaeouach from the Oukaimeiden Observatory in Morocco using a CDK 12.5 telescope.
Data processing by Jean-Baptiste Auroux.

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NGC 1300 est une galaxie spirale barrée de grand style située dans la constellation de l'Éridan , à environ 69 millions d'années-lumière (de nombreuses mesures du redshift vont davantage dans le sens d'une distance moins élevée, de l'ordre de 45 MAL).

Selon sa distance réelle, sa taille est estimée entre 110 000 et 183 000 AL de diamètre.

Son caractère distinctif est bien sûr sa très longue barre centrale. Les photographies prises par le télescope spatial Hubble montrent que le noyau de NGC 1300 présente une extraordinaire et distincte structure, avec une spirale interne qui s'étend sur environ 3000 années-lumière.

Il semble que seules les galaxies munies d'une longue barre centrale possèdent un disque interne présentant une structure spirale : une "spirale dans une spirale" en quelque sorte...

Cette image a été traitée en drizzle 2x puis réduite à 50% après traitement, pour favoriser la préservation des détails au maximum.

Acquisitions par Aziz Kaeouach de l'Observatoire de l'Oukaimeiden au Maroc à l'aide d'un télescope CDK 12.5.
Traitement des données par Jean-Baptiste Auroux.

Imaged with N.I.N.A.
AAA : Astronomes et Astrographes Amateurs
Astrophotographes (France)
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Status	Advanced success
Started	...
PixInsight job	YB2EFY3E9PXFPCJ2VXOH5DWD3FAM82NZ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h19m41s.270
RA (top/left)	03h18m41s.610
RA (top/right)	03h20m52s.662
RA (bottom/right)	03h20m40s.826
RA (bottom/left)	03h18m29s.498

Dec (center)	-19°24′42″.30
Dec (top/left)	-19°37′10″.74
Dec (top/right)	-19°33′04″.31
Dec (bottom/right)	-19°12′12″.15
Dec (bottom/left)	-19°16′18″.19

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