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Name / Constellation

NGC 457

Other: C 13, Cr 12, Mel 7, OCL 321, Lund 43,H VII-42, h 97,

GC 256

Cas
Coordinates AR: 01h 19m 35s - Dec: +58° 17′ 12″
Optics Takahashi FSQ 106N APO Fluorite F5 - 60/220 guiding refractor
Camera-Mount SBIG STF8300M - Orion StarShot Guider - 10Micron GM2000 QCI Mount
Filters Baader LRGB
Exposure
  • Luminance
  • Red
  • Green
  • Blue
  • 12 x 300 sec - 1 hour
  • 11 x 300 sec - 55 min
  • 11 x 300 sec - 55 min
  • 11 x 300 sec - 55 min
  • UNBINNED
  • BINNING 2X2
  • BINNING 2X2
  • BINNING 2X2
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - 14 nov (RGB) & 18 Nov (Lum) 2018
Seeing About 2." @ 2.1 arcosec/pixel unbinned
Note  
Acquisition MaxIm DL - CCD Autopilot 5
Processing Adobe Photoshop CS6 -
Comment

NGC 457 (also known as the Owl Cluster, the ET Cluster, or Caldwell 13) is an open star cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1787, and lies over 7,900 light yearsaway from the Sun. It has an estimated age of 21 million years. The cluster is sometimes referred by amateur astronomers as the Owl Cluster, Kachina Doll Cluster, the ET Cluster (due to its resemblance to the movie character) or the "Skiing Cluster". Two bright stars, magnitude 5 Phi-1 Cassiopeiae and magnitude 7 Phi-2 Cassiopeiae can be imagined as eyes. The cluster features a rich field of about 150 stars of magnitudes 12-15.