The bright open star cluster, in this image is known as Melotte 15 after its discoverer, Philibert Jacques Melotte (1880-1961). Melotte 15 is embedded within and illuminates the central portion of the much larger glowing nebula identified as IC 1805.
The Heart Nebula, IC 1805, Sh2-190, lies some 7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. This is an emission nebula showing glowing gas and darker dust lanes. The nebula is formed by plasma of ionized hydrogen and free electrons.
The interesting structure in the right of the image is a giant area of hydrogen gas that is caused to glow by the intense ultraviolet radiation from the massive stars of the Melotte 15 star cluster.
Dust and gas clouds are eroded by the pressure of the intense radiation.
Dust and gas clouds are eroded by the pressure of the intense radiation.
The Melotte 15 star cluster is estimated to be 7,500 light years away from Earth.
S[II] 8nm(Red)_Ha 5nm(Green)_O[III] 3nm(Blue)
Modified Hubble Palette
Instruments and exposure data:
S[II] 22*15min_Ha 39*10min_O[III] 26*15min
total exposure time : 1110min (18h 30min)
W.O FLT110 with dedicated TMB field flattener
FeatherTouch 3'' focuser
Starizona MicroTouch autofocuser
W.O ZS80 ED
SBIG ST10XME CFW9
Meade DSI
Sky-Watcher EQ6 Pro
Filters:
Ha 5nm Astrodon
S[II] 8nm Baader
O[III] 3nm Astrodon
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