LDN 1451 & LDN 1455 (Darius Kopriva)

Celestial hemisphere: Northern · Constellation: Aries (Ari) · Contains: B1 · B202 · B203 · B204 · B205 · B206 · HD20367 · HD20644 · HD20812 · HD20873 · HD21483 · HD21820 · HD21834 · LBN 740 · LBN 741 · LBN 746 · LDN 1448 · LDN 1450 · LDN 1451 · LDN 1452 · LDN 1455 · NGC 1333 · VdB13 · VdB16

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LDN 1451 & LDN 1455

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LDN 1451 & LDN 1455

LDN 1451 and LDN 1455 are two dark nebulae in the Perseus Molecular Cloud.

The Perseus molecular cloud (Per MCld) is a nearby (~1000 ly) giant molecular cloud in the constellation of Perseus and contains over 10,000 solar masses of gas and dust covering an area of 6 by 2 degrees. Unlike the Orion molecular cloud it is almost invisible apart from two clusters, IC 348 and NGC 1333, where low-mass stars are formed. It is very bright at mid and far-infrared wavelengths and in the submillimeter originating in dust heated by the newly formed low-mass stars.

It shows a curious ring structure in maps made by the IRAS and MSX satellites and the Spitzer Space Telescope and has been detected by the COSMOSOMAS at microwave frequencies as a source of anomalous "spinning dust" emission.

A dark nebula or absorption 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. The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules. Like other interstellar dust or material, things it obscures are only visible using radio waves in radio astronomy or infrared in infrared astronomy.

Southern Hemisphere Astro

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	6832630
PixInsight job	UQP5MK2T6GXCY5R2NXQOEO5C69ESOKD8
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h26m32s.26
RA (top/left)	03h16m59s.23
RA (top/right)	03h35m15s.88
RA (bottom/right)	03h36m18s.78
RA (bottom/left)	03h17m33s.17

Dec (center)	+30°07′15″.9
Dec (top/left)	+28°55′55″.3
Dec (top/right)	+28°40′00″.3
Dec (bottom/right)	+31°15′52″.7
Dec (bottom/left)	+31°32′17″.5

Image Index:

Contribution Index (beta):

LDN 1451 & LDN 1455

LDN 1451 & LDN 1455

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Image Index:

Contribution Index (beta):

LDN 1451 & LDN 1455

LDN 1451 & LDN 1455

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