Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 436  ·  NGC 457  ·  The star φCas
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ET Cluster - 11/6/2010, 


ET Cluster - 11/6/2010
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ET Cluster - 11/6/2010

Technical card

Imaging telescopes or lenses: Stellarvue SV105

Imaging cameras: QHYCCD QHY9M

Mounts: Takahashi EM-200 Temma2

Guiding telescopes or lenses: Orion ST 80

Software: PHD guiding  ·  Sequence Generator Pro  ·  PixInsight  ·  Nebulosity

Filters: Astronomik B Type IIc  ·  Astronomik G Type IIc  ·  Astronomik R Type IIc

Dates:Nov. 6, 2010

Astronomik B Type IIc: 10x180" -15C bin 1x1
Astronomik G Type IIc: 10x180" -15C bin 1x1
Astronomik R Type IIc: 10x180" -15C bin 1x1

Integration: 1.5 hours

Avg. Moon age: 0.32 days

Avg. Moon phase: 0.11%

Basic astrometry details

Astrometry.net job: 148549

RA center: 1h 18' 40"

DEC center: +58° 17' 49"

Pixel scale: 2.694 arcsec/pixel

Orientation: -90.596 degrees

Field radius: 0.847 degrees

Resolution: 620x388


The ET Cluster (named for its resemblance to ET), is some 7900 light years distant in the constellation Cassiopeia. Open clusters are groups of "sibling" stars born from the same stellar nursery (hydrogen nebulae). The stars you see in this cluster are approximately 21 million years old. Some of the stars are of different colors because they vary in mass (despite their common age). There are about 150 stars in this cluster.


Sky plot

Sky plot


ET Cluster - 11/6/2010,