Heart Nebula, IC 1805 (Jared Willson)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD14695 · HD14749 · HD14794 · HD14795 · HD14817 · HD15069 · HD15238 · HD15239 · HD15250 · HD15382 · HD15522 · HD15557 · HD15558 · HD15570 · HD15629 · HD15640 · HD15665 · HD15785 · HD15851 · HD15862 · HD16038 · HD16088 · HD16183 · HD16218 · HD16349 · HD16410 · HD16429 · HD236966 · IC 1795 · IC 1805 · And 27 more.

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Heart Nebula, IC 1805

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Heart Nebula, IC 1805

The Heart Nebula (IC 1805) lies roughly 7,500 light years from Earth in the Perseus arm of the Milky Way. It was first observed and cataloged by prolific observer William Herschel in 1787 and is composed primarily of ionized hydrogen interspersed with darker dust lanes. The knot of gas at the lower right of this image is separately cataloged as NGC 896. The source of energy creating all the ionized gas is the cluster of stars Collinder 26 (also known as Melotte 15) located near the center of the Heart nebula. It contains stars that are up to fifty times the mass of the sun. These very hot, very energetic starts emit a large amount of ultraviolet light which is energetic enough to ionize the surrounding gas. The surface brightness of the Heart Nebula is moderately low, with an integrated magnitude of 18.3 spread over more than two degrees of sky.

This image of the Heart Nebula was captured using a 3nm Hydrogen Alpha filter. Due to the large amount of sky covered by the Heart Nebula, this image is a four panel mosaic. All data were collected with a nearly full moon, hence the need for a narrow band filter exclusively. Integration time listed is for each panel, so total exposure time across all four panels is 4x that listed.

Please note: The following tables are updated every 24 hours.

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	Advanced success
Started	...
Astrometry.net job	8657497
PixInsight job	8K8B8UM2PGU4PLYYA7WI1RV5344XCCE4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h32m35s.41
RA (top/left)	02h41m06s.29
RA (top/right)	02h41m21s.87
RA (bottom/right)	02h23m11s.17
RA (bottom/left)	02h24m39s.13

Dec (center)	+61°17′13″.9
Dec (top/left)	+59°44′15″.1
Dec (top/right)	+62°51′02″.4
Dec (bottom/right)	+62°48′00″.2
Dec (bottom/left)	+59°41′29″.8

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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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