IC 1805 Melotte 15 Heart Nebula

IC 1805 Melotte 15 Heart Nebula (original file here)

Cosmic clouds form fantastic shapes in the central regions of emission nebula IC 1805. The clouds are sculpted by stellar winds and radiation from massive hot stars in the nebula’s newborn star cluster, Melotte 15. About 1.5 million years young, the cluster stars are scattered in this colorful skyscape, along with dark dust clouds in silhouette against glowing atomic gas. A composite of narrowband and broadband telescopic images, the view spans about 15 light-years and includes emission from ionized hydrogen, sulfur, and oxygen atoms mapped to green, red, and blue hues in the popular Hubble Palette. Wider field images reveal that IC 1805’s simpler, overall outline suggests its popular name – The Heart Nebula. IC 1805 is located about 7,500 light years away toward the boastful constellation Cassiopeia. (info from NASA)

From Wikipedia, the free encyclopedia

Heart Nebula
Emission nebula
H II region
Observation data: J2000.0 epoch
Right ascension 02h 33m 22s
Declination +61° 26′ 36″
Distance 7,500 ly
Apparent magnitude (V) 18.3
Apparent dimensions (V) 150′ x 150′
Constellation Cassiopeia
Physical characteristics
Radius 165 ly
Absolute magnitude (V) 6.5
Designations NGC 896, IC1805Sh2-190
See also: Lists of nebulae
The Heart Nebula captured in Ha, Sii and Oiii. Presented in the Hubble Palette by Leeds UK based amateur astro-photographer urmymuse

The Heart NebulaIC 1805Sharpless 2-190, is some 7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It was discovered by William Herschel on 3 November 1787.[1] It is an emission nebula showing glowing ionized hydrogen gas and darker dust lanes.[2]

The brightest part of the nebula (a knot at its western edge) is separately classified as NGC 896, because it was the first part of the nebula to be discovered. The nebula’s intense red output and its morphology are driven by the radiation emanating from a small group of stars near the nebula’s center. This open cluster of stars, known as Collinder 26 or Melotte 15, contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun’s mass.[1]

The Heart Nebula is also made up of ionised Oxygen and Sulfur gasses, responsible for the rich blue and orange colours seen in narrowband images. The shape of the nebula is driven by stellar winds from the hot stars in its core. The nebula also spans almost 2 degrees in the sky, covering an area four times that of the diameter of the full moon.[3]


IC 1805 Melotte 15 Heart Nebula HA filter image (original file here)
Starless IC 1805 Melotte 15 Heart Nebula (original file here)


Imaging Telescopes Or LensesWilliam Optics 81GT IVImaging
Cameras ZWO ASI 6200 MM Pro
Mounts Celestron Advanced VX Goto GEM Celestron AVX
Filters ZWO SII 7nm 2″ · ZWO OIII 7nm 2″ · ZWO H-alpha 7nm 2″
AccessoriesWilliam Optics Flat 6AIII William optics 6aiii
Software Adobe Photoshop 2021 · PixInsight 1.8 Ripley PinInsight 1.8.8
Guiding Telescopes Or LensesWilliam Optics RedCat 51 Petzval APO Redcat 51
Guiding CamerasZWO ASI522mc-pro color ZWO

 Acquisition details

Dates:Jan. 4, 2022
ZWO H-alpha 7nm 2″: 44×300″ (3h 40′) (gain: 135.00) -15C bin 1×1
ZWO OIII 7nm 2″: 20×300″ (1h 40′) (gain: 135.00) -15C bin 1×1
ZWO SII 7nm 2″: 14×300″ (1h 10′) (gain: 135.00) -15C bin 1×1
Avg. Moon age:1.98 daysAvg. Moon phase:4.39%

Basic astrometry details
Astrometry.net job: 5389275
Resolution: 2359×1362
Locations: Fareham, United Kingdom
Data source: Backyard Own Observatory