2024 Michael A. Siniscalchi

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Odds n Ends

     Emission Nebula in Cassiopeia
          RA 02h 32m 39s  Dec: +61 19' 13" Distance ~7500 ly


The Heart Nebula (also known as the Running dog nebula, IC 1805, Sharpless 2-190) is an emission nebula, 7500 light years away from Earth and located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It was discovered by William Herschel on 3 November 1787. It displays glowing ionized hydrogen gas and darker dust lanes.

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 the Sun, and many more dim stars that are only a fraction of the Sun's mass.

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.

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Location & Date
Backyard, Abbott Observatory- Long Island, NY,  Dec. 15-16, 2023
Askar FRA400 F/5.5 Quintuplet Petzval Astrograph, ZWO focuser, iOptron GEM45G mount
Image scale 1.93 arcsec/pixel
Player One Poseidon-M Pro
Antlia  Ha (4.5nm) & SII OIII 3nm Pro filters
Sensor temp -15C
Ha-12x5m SII-18x5m OIII-18x5m Bin 1x1  Gain=0 Offset=20
Planning & Acquisition
Sequence Generator Pro
Astro Pixel Processor - calibration, stacking
Photoshop  2024 - HSO combine
RC-Astro- Star xTerminator, Noise xTerminator
Click on image for medium size
Click here for the full size

Initial stretch of 1 hour of Hydrogen Alpha (Ha) taken with Antlia 4.5nm filter.

Initial stretch of 1 1/2 hours of Sulfur (SII) taken with Antlia 3nm filter
Initial stretch of 1 1/2 hours of Oxygen (OIII) taken with Antlia 3nm filter