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NGC 457

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About this observation
Observer
Peter Mulligan
Time of observation
07/09/2019 - 22:23
Object
NGC 457
Observing location
Sheffield, UK
Equipment
Skywatcher 200p on EQ5
Canon 1100D
Exposure
45-30 sec, 800 ISO,
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This open cluster in Cassiopeia as got a few nicknames, The Owl or ET cluster etc.  Gaia DR2  gives its distance as over 10,000 l/y, The bright star Phi Cas is spectral type F0Ia  a luminous super giant.  Gaia data puts its distance at 13,000l/y, so if this is correct its absolute magnitude would be -8.0M, that is a whopping 135,000 times the Suns luminosity 

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