2022 Michael A. Siniscalchi

What's New



Odds n Ends

       NGC 457
       Open Cluster in Cassiopeia
           RA:01h 19m 35s  Dec: +58 17' 30" Distance - ~7900 ly Size- 13'

Location & Date
Backyard, Abbott Observatory- Long Island, NY,  October 2022
TMB130SS  910mm F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Baader RGB  filters
CCD temp -10C
Red-20x2m  Green-20x2m  Blue-20x2m Bin 1x1
Planning & Acquisition
Sequence Generator Pro

CCDStack -  Calibration, Debloom
Astro Pixel Processor - RGB Frame processing, RGB combine
Adobe PS -  Color processing
RC-Astro- Star XTerminator & NoiseXTerminator


NGC 457 (also designated Caldwell 13, and known as the Dragonfly Cluster, E.T. Cluster, Owl Cluster, Kachina Doll Cluster or Phi Cassiopeiae Cluster) is an open star cluster in the constellation Cassiopeia.
It was discovered by William Herschel on August 18, 1780, with a 6.2 inch reflector telescope, and catalogued as VII 42.
It lies over 7,900 light years away from the Sun. It has an estimated age of 21 million years. The cluster is sometimes referred by amateur astronomers as the Owl Cluster or the E.T. Cluster (due to its resemblance to the movie character). Two bright stars Phi Cassiopeiae (magnitude 5 and spectral type F0) and HD 7902 (magnitude 7) can be imagined as eyes. It is not yet clear if Phi Cassiopeiae is a member of the cluster, and if it is, then it would be one of the brightest stars known, surpassing Rigel in luminosity. For comparison, our sun at the same distance as Phi Cassiopeiae would shine at just 17.3 magnitudes. The next brightest star is the red supergiant variable star V466 Cassiopeiae. The cluster features a rich field of about 150 stars of magnitudes 9-13. About 60 stars have been identified as true members of the cluster.

Click on image for full size

Messier 103 position shown relative to our location (Sun) in the Milky Way Galaxy
Galatic Longitude: 128.1
Galatic Latitude: -4.31
Distance from Galatic Plane:169 ly below the galatic plane

Above image and info provided by Our Galaxy 3D Atlas application and used with permission by Otherwise