The Shark (vikas chander)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: 16 Cep · 24 Cep · HD208509 · HD210615 · HD210806 · HD211300 · HD211771 · LBN 535 · LBN 541 · LBN 546 · LDN 1235 · The star 16 Cep · VdB149

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The Shark

Link: www.vikaschander.com

Powered byPixInsight

The Shark

Link: www.vikaschander.com

Of all the different types of objects in space, I find dark nebulae the most intriguing as well as challenging to capture and process. Dark Nebulae, or absorption nebulae are dark clouds of dust in space, sometimes so dense that they block the light emitting from stars behind them. They have been catalogued over the years and the Lynds Dark nebulae catalog or the LDN catalog is quite comprehensive in its entries of dark nebulae. One of the entries in the catalog is LDN 1235 shown here and often referred to as the Shark nebula, given its resemblance to the Chondrichthyes class of the Oxyrinchus species!!

The data was collected at Roboscopes from their observatory in Spain which hosts several other telescopes. The E180 is particularly suited for imaging dark nebulae as it can collect a lot of light in very short exposures thanks to its F2.8 aperture. Imaging being done on a one shot color camera presents its own challenges but I feel dark nebulae are well suited to OSC imaging. Luminance data is really not needed to add sharpness and details and nor do these regions benefit from any narrowband data. As the quality of data collected was of a very high standard not much effort was needed to process it in Pixinsight. The image scale was 2.45”/pixel so drizzling the data might have benefitted a bit ….your thoughts?

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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	Advanced success
Started	...
Astrometry.net job	8121853
PixInsight job	OGB6HVBR65ABI0ET1UBJFNI0EV39OVBC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h06m42s.44
RA (top/left)	22h24m52s.23
RA (top/right)	21h47m34s.24
RA (bottom/right)	21h50m17s.10
RA (bottom/left)	22h24m15s.51

Dec (center)	+73°09′02″.8
Dec (top/left)	+73°58′47″.10
Dec (top/right)	+73°51′06″.6
Dec (bottom/right)	+72°13′52″.7
Dec (bottom/left)	+72°20′52″.9

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The Shark

The Shark

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Image Index:

Contribution Index (beta):

The Shark

The Shark

Equipment

Acquisition details

Description

Comments

Acquired at

Sky plot

Histogram

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