My Planetary Nebula Photoed at 2021 (Huanyu Ren)

My Planetary Nebula Photoed at 2021

Acquisition type: Lucky imaging

Those amazing photos of PN were captured by my little Newtonian reflector, whose caliber is only 150 mm. My shooting environment is just the center of city (Porter level eight). Before my testing, I never imagine that these extremely small target can be photoed at this terrible condition, but the preview of them shocked me. So I take advantage of my spare time to capture them whenever weather is permitted. Review the 2021 that just passed, I shot a total of 17 subjects, they are:
Blue Snowball Nebula(NGC 7662), NGC 2440, Bow-Tie Nebula(NGC 40), Ghost of Jupiter(NGC 246), Eskimo Nebula(NGC 2392), Cleopatra's Eye(NGC 1535), NGC 2438, Cat's Eye Nebula(NGC 6543), The Saturn Nebula(NGC 7009), Owl Nebula(M 97), Crystal ball Nebula(NGC 1514), The Blinking Nebula(NGC 6826), The Oyster Nebula(NGC 1501), The Dumbbell Nebula(M 27), The Ring Nebula(M 57), The Helix Nebula(NGC 7293), The Little Dumbbell Nebula(M 76)
[The picture order is from left to right; from top to bottom]
The majority of them were photoed with 10 s per frame, and 600 frames stacked. Some dark targets had longer exposure time, for example, NGC 1514 is 180 s per frame, and NGC 7293 is 300 s per frame.

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.

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Astrometry.net job	n/a
PixInsight job	n/a
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