Contains: IC 1805
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Melotte 15 - Pulmonary Semilunar Valve of the Heart

Technical card

Resolution: 3424x4281

Dates: Dec. 3, 2017Dec. 27, 2017Dec. 30, 2017

Astrodon Ha 5nm: 78x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 85x240" (gain: 139.00) -20C bin 1x1
Astrodon SII 3nm: 59x240" (gain: 139.00) -20C bin 1x1

Integration: 14.8 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 11.61 days

Avg. Moon phase: 83.96%

Bortle Dark-Sky Scale: 6.33 job: 1874637

RA center: 38.415 degrees

DEC center: 61.461 degrees

Pixel scale: 0.649 arcsec/pixel

Orientation: 3.430 degrees

Field radius: 0.494 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States


Melotte-15 is the star cluster at the heart of the Heart Nebula. It is an OB association of very young hot blue supergiant stars that is only 1.5 million years old. Fierce stellar winds from this cluster have blown the enormous bubble within the parent HII nebula that is the heart nebula. The winds have also sculpted the dust clouds within which other stars are forming into interesting columns and shapes, analogous to the Pillars of Creation in the Eagle Nebula.



Douglas J Struble

Sky plot

Sky plot


Melotte 15 - Pulmonary Semilunar Valve of the Heart, 


        Douglas J Struble