Heart Nebula, IC 1805 (James Cloudman)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1795 · IC 1805 · NGC 896

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Heart Nebula, IC 1805

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Heart Nebula, IC 1805

Somewhere in the vastness of space, a cosmic heart beats. It is not a living organ, but a glowing cloud of gas and dust, illuminated by the light of newborn stars. This is the Heart Nebula, also known as IC 1805, a stellar nursery located about 7,500 light years from Earth in the constellation Cassiopeia. It was discovered by William Herschel in 1787, who was fascinated by the wonders of the night sky.

The Heart Nebula is a testament to the beauty and diversity of nature. It spans about 150 light years across, and contains a variety of structures and colors. The bright red regions are rich in hydrogen, the most abundant element in the universe and the fuel of stars. The dark lanes are dust, which blocks the light from behind and creates intricate patterns. The blue and green hues are from oxygen and sulfur, which are ionized by the intense radiation of the massive stars in the center. These stars, known as Melotte 15, are some of the most luminous and energetic in our galaxy. They are also very young, only a few million years old, compared to the Sun’s age of 4.6 billion years.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
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Astrometry.net job	8805072
PixInsight job	n/a
PixInsight queue size	n/a
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Heart Nebula, IC 1805

Heart Nebula, IC 1805

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Heart Nebula, IC 1805

Heart Nebula, IC 1805

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