NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla) (AnaTa)

Celestial hemisphere: Northern · Constellation: Aquila (Aql) · Contains: NGC 6781 · PK041-02.1

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NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

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NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

This is lucky imaging. Exposure was kept at minimum. No Lum frame above FWHM of 2 accepted. So, it led to about 70% rejections, and final FWHM for Lum is 1.4 arcsec. Comparision with ESO 3.6m La Silla is B-panel.
This is LRGB image. HOO image will be processed separately.

Processing:
RGB are combined.
Cropping for Ha, O3, Lum and RGB
DBE for Ha, O3, Lum and RGB
Color Colib for RGB
Blur and Noise XT for Ha, O3, Lum and RGB
Manual stretching (with HT) for Ha, O3, Lum and RGB
Lum and RGB combined - LRGB
Noise XT again for LRGB
Stretching again with HT for LRGB
Star XT. These stars have been kept.

Simple Lum mask
Local Histogram Equalization: Kernel radius of 10, 40 and then 90
Multiscale-median transform for sharpness.
Curves: saturation and brightness are manipulated.
Mask off.
Saturated and shrinked stars are added.
Done

Original
Final
D
F

Nebulas (Planetary)

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	Distinct awarded users	Total awarded images
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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
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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
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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	8078072
PixInsight job	GOLXW8BR4KZNN5SBSDUBOGSXOPU9FQPK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h18m28s.321
RA (top/left)	19h18m48s.744
RA (top/right)	19h18m07s.517
RA (bottom/right)	19h18m07s.799
RA (bottom/left)	19h18m49s.980

Dec (center)	+06°32′20″.20
Dec (top/left)	+06°37′19″.23
Dec (top/right)	+06°37′13″.75
Dec (bottom/right)	+06°27′21″.30
Dec (bottom/left)	+06°27′26″.88

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Contribution Index (beta):

NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

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Image Index:

Contribution Index (beta):

NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

NGC 6781, the Snowball nebula, LRGB (lucky imaging vs ESO 3.6m La Silla)

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these collections

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