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Praesepe Cluster, 


            José J. Chambó

Technical card

Imaging telescopes or lenses: Meade ETX-70

Imaging cameras: Canon EOS 350D / Digital Rebel XT

Mounts: LXD75

Guiding telescopes or lenses: Bresser Skylux 70/700

Guiding cameras: Human Hand-guided

Software: DeepSkyStacker  ·  PixInsight LE

Dates:April 10, 2010

Frames: 10x120" (20') ISO200

Integration: 20'

Darks: ~5

Flats: ~8

Bias: ~8

Avg. Moon age: 25.80 days

Avg. Moon phase: 14.97%

Bortle Dark-Sky Scale: 6.00

Mean SQM: 18.50

Mean FWHM: 4.11

Basic astrometry details job: 106646

Resolution: 620x496

Locations: Vallés - Valencia (Spain), Vallés, Valencia, Spain


This is an Open Cluster of bluish stars in the constellation of Cancer, named on ancient by Greeks as "Praesepe" (also named as the Beehive). Hipparcos depicted it as a "small cloud" or "cloudy star" that is its look seen at naked eye, until on 1610 Galileo trough your telescope discovered that "it isn't only a star, but a mass of more than 40 small stars" wich is that we can perceive observing it with simple binoculars as is seen in this photo.

More info into the Blog  C O M E T O G R A F I A(in Spanish)



Praesepe Cluster, 


            José J. Chambó