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Lagoon Nebula



IC 1805 and Mel 15 in Cassiopeia

RA: 2 hrs 32 min; Dec 61 deg 29 min

Date & Site:

8/22-23/14; Palomar Mountain

Clear; very good seeing; little or no wind; temps in the upper 50's


Telescope: FSQ 106 (540mm fl f5)

Mount: AP1100
Camera: ST-10XME; CFW10 with Astrodon Ha, OIII, and SII (3 nm) and Gen II RGB filters;

Auto guiding: External/SBIG guide camera for SHO and internal guidechip for RGB


Exposures and filters: 165:150:135 min for Ha, OIII, and SII respectively; 30 min each of RGB. Total exposure: 9 hrs

Color mapped using the Hubble Palette with R=SII; B=OIII, and G=Ha. Standard color data added as layer for star colors.

FOV =90 x 63 arc minutes

From wikipedia: Also known as the Heart Nebula, IC 1805, Sh2-190, lies some 7500 light years away in the Perseus Arm of our 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 nebula's intense output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This Open Cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun

Distance: ~7,500 light years

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