M31 Ha&Oiii Arc (YAGUANG WAN)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 32 And · 35 And · 35 nu. And · Andromeda Galaxy · HD3431 · HD3447 · HD3741 · HD3765 · HD3827 · HD4143 · HD4174 · HD4322 · HD4669 · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star 32 And · The star ν And

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M31 Ha&Oiii Arc

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M31 Ha&Oiii Arc

This is the first image I captured at the Daocheng Glacier Observatory in Daocheng County, Sichuan, China. Over a period, I accumulated nearly 100 hours of exposure, continuously optimizing the shooting plan based on the results of image processing. Eventually, I utilized 5 hours each of RGB and 20 hours of Luminance, resulting in a fairly decent RGB image. I also captured 20 hours of H-alpha (Ha), obtaining some background information. However, the OIII signal was extremely weak, and even after more than 30 hours of exposure, the signal-to-noise ratio was still insufficient. The post-processing was also a continuous research process. The extremely weak OIII signal made it very challenging to represent effectively. In the end, after trying various methods and continuous learning, I completed this image. Although there is still a gap compared to the works of the predecessors, I am fully satisfied with having managed to capture the OIII ARC through my own efforts.

Takahashi Epsilon

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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
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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 success
Started	...
Astrometry.net job	8824531
PixInsight job	L10PHT1X0ZYR6SODS2LG0KLAKPZXE34A
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h43m18s.37
RA (top/left)	00h38m31s.80
RA (top/right)	00h51m08s.23
RA (bottom/right)	00h48m23s.29
RA (bottom/left)	00h35m05s.26

Dec (center)	+40°55′55″.5
Dec (top/left)	+38°53′05″.4
Dec (top/right)	+39°15′39″.4
Dec (bottom/right)	+42°57′57″.6
Dec (bottom/left)	+42°34′11″.8

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M31 Ha&Oiii Arc

M31 Ha&Oiii Arc

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M31 Ha&Oiii Arc

M31 Ha&Oiii Arc

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