IC 2169 - Dreyers Nebula (Darius Kopriva)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: IC 446 · IC 447

IC 2169 - Dreyers Nebula, Darius Kopriva

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IC 2169 - Dreyers Nebula

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IC 2169 - Dreyers Nebula

IC 447 (and friends) is a large reflection nebula located in the Constellation of Monoceros. Beautiful blue glow immersed in the sorrounding H-alpha emission; coupled with dark nebula on the northwest, this field offers a rich view.

In astronomy, reflection nebulae are clouds of interstellar dust which might reflect the light of a nearby star or stars. The energy from the nearby stars is insufficient to ionize the gas of the nebula to create an emission nebula, but is enough to give sufficient scattering to make the dust visible.

H-alpha (Hα) emission is the red visible spectral line created by a hydrogen atom when an electron falls from the third lowest to second lowest energy level. This transition corresponds to a wavelength of 656.28 nm (red light) and is the first transition in the Balmer series.

A dark nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebulae.

Southern Hemisphere Astro
Takahashi Epsilons
Astrophotography in Spain
Dark Nebula

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	Distinct awarded users	Total awarded images
Image of the day
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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

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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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 failed
Started	...
Astrometry.net job	5510516
PixInsight job	AZM4TWVMZB1AV7D4LZ1WILYZZLPXI9V9
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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IC 2169 - Dreyers Nebula

IC 2169 - Dreyers Nebula

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IC 2169 - Dreyers Nebula

IC 2169 - Dreyers Nebula

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