NICOLAS ROLLAND · ASTROPHOTOGRAPHY
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E.T. Cluster

NGC 457
NGC 457, the Owl Cluster in Cassiopeia, its two brightest stars forming glowing eyes, in 24.3 hours of HaLRGB

Processed by Nicolas Rolland, Paris, as part of the Astrofleet Team. 24.3 hours gathered with our own setup at PixelSkies, Castilléjar, Spain.

NGC 457 (Caldwell 13), also known as the "Owl Cluster" or "E.T. Cluster" is a very young open cluster located in the constellation of Cassiopeia. It contains about eighty stars and is estimated to be around 5,200 light-years away from the Sun. Recent estimates suggest that this cluster is 21 million years old and spans about 46 light-years.

This image was shot in LRGBH, and to our surprise, there's a lot of hydrogen in the background!
Version française
NGC 457 (Caldwell 13), appelé aussi « amas de la Chouette » ou « amas d'E.T. », est un amas ouvert très jeune situé dans la constellation de Cassiopée. Il renferme quelques quatre-vingts étoiles et sa distance au Soleil est estimée à environ 5200 années-lumière.Les dernières estimations donnent un âge de 21 millions d'années à cet amas et sa taille est d'environ 46 années-lumière.
 
Cette image fut shooté en LRVBH, et à notre grand étonnement, il y a beaucoup d'hydrogène dans le fond de ciel !

TECHNICAL DATA

ACQUISITION DETAILS

OPTICS TS-Optics CF-APO 155mm @ F/8
CAMERA ZWO ASI2600MM Pro
MOUNT iOptron CEM70
FILTERS Ha, L, R, G, B
LOCATION PixelSkies, Castilléjar, Granada, Andalucia, Spain
DATE December 2023
EXPOSURES 24.3 hours (Ha 166x 300 sec, L 120 x 180 sec, R 30 x 180 sec, G 30 x 180 sec, B 30 x 180 sec)
PROCESSING SOFTWARE Pixinsight, CCDstack, Photoshop
COPYRIGHTS Nicolas Rolland & Team Astrofleet
ngc-457-cluster-halrgb-wide-astrofleet-chart

TARGET DETAILS

RA 01h 19m 38.7s
DEC +58° 14' 35.1"
MAGNITUDE 6.4
SIZE 62.6 x 41.7 arcmin
PIXEL SCALE 0.626 arcsec/pixel
ORIENTATION Up is 272 degrees E of N
CONSTELLATION Cassiopeia