Emission Nebula In Cassiopiea
Optics: 8" f/4 Newtonian Astrograph w/Baader MPCC Coma Corrector
Platform: Astrophysics AP1200
Camera: Hutech Modified Canon XTi @ ISO800
Exposure: 24 x 5m = 2 hours
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing 4/10, Transparency 9/10
Outside Temperature: 55F
Processing Tools: Photoshop CS2, Images Plus 3.82
HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS
GLOBULARS OPEN CLUST PLANETARIES LINKS
the dim but moderately rich open cluster IC1590 is Sharpless2-184,
also known as NGC281. The nebula is quite large, spanning over
half a degree in size, filled with dark Bok globules, the birthplace
of stars. The cluster on the other hand is a respectable 7.4
magnitude, but only 4 minutes in size.
Seen here clearly
is the unique color differentiation from bright core to outer
nebulosity. While the core has more blues which yield a bluish
pink tint the outer most nebulosity is deep red and represents
a much lower level of hydrogen excitation. The beautiful dark
nebula superimposed are called Bok Globules, and represent areas
of a higher density of dust becoming gravitationally bound.