NICOLAS ROLLAND · ASTROPHOTOGRAPHY
STAR CLUSTERS
E.T. Cluster
— NGC 457 —
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.
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.
Technical data
OpticsTS-Optics CF-APO 155 mm @ f/8
CameraZWO ASI2600MM Pro
MountiOptron CEM70
FiltersHa, L, R, G, B
PaletteHLRGB
Ha blended into red
LocationPixelSkies, Castilléjar, Spain
DateDecember 2023
Exposures24.3 hours
Ha 166 × 300 sec · L 120 × 180 sec · R 30 × 180 sec · G 30 × 180 sec · B 30 × 180 sec
SoftwarePixinsight, CCDstack, Photoshop
CopyrightsNicolas Rolland & Team Astrofleet
Finding chart
RA01h 19m 38.7s
Dec+58° 14′ 35.1″
Size62.6 × 41.7 arcmin
Orientationup is 272° E of N
ConstellationCassiopeia