M31 - Andromeda Galaxy Core (Steve Ludwig)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: Andromeda Galaxy · HD3969 · M 31 · M 32 · NGC 221 · NGC 224

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M31 - Andromeda Galaxy Core

Powered byPixInsight

M31 - Andromeda Galaxy Core

Equipment

- Main scope: Bresser Messier 10" Newton (254/1270)
- Main camera: Nikon D3300 (unmodified)
- Guide scope: Orion AC 50/162 Deluxe Mini
- Guide camera: ZWO ASI 290MC
- Mount: Skywatcher EQ6-R
- Explore Scientific HR coma corrector

Acquisition

- 45 lights x 300 s = 3 h 45 min
- no dark, flat, bias frames
- no filters
- ISO 200
- Bortle 4

Processing (latest revision)

- stacked in DSS
- bilinear debayer method & median kappa sigma clipping

- unmodified TIF opened in PixInsight
- STF stretch
- dynamic crop
- dynamic background extraction
- background neutralization
- image solver
- photometric color calibration
- histogram transformation
- SCNR green to remove greenish noise
- BlurXTerminator to improve sharpness of stars and fine background details
- Starnet 2 to separate stars & background
- background: masked curves transformation to increase saturation of brighter areas
- stars: curves transformation to increase saturation
- stars: color inversion + SCNR green + another color inversion to get rid of partly pinkish stars
- pixel math to recombine stars & background
- resample 50% to improve general noise (not much detail loss as the image was oversampled anyway)
- final histogram / curves transformations
- saved as jpg

Original
Final
B

B

Description: Main changes in the new revision:

- More careful Dynamic Background Extraction to get rid of a blueish gradient in the upper right corner
- Application of the BlurXTerminator Pixinsight plugin to improve deconvolution quality

Uploaded: ...

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	6895464
PixInsight job	C0HFYR2367MCPWJ4M7ZQIWS4EYFP2T02
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m40s.56
RA (top/left)	00h43m47s.87
RA (top/right)	00h44m33s.29
RA (bottom/right)	00h41m32s.24
RA (bottom/left)	00h40m49s.25

Dec (center)	+41°15′40″.2
Dec (top/left)	+40°46′41″.4
Dec (top/right)	+41°39′14″.9
Dec (bottom/right)	+41°44′36″.5
Dec (bottom/left)	+40°51′59″.4

Image Index:

Contribution Index (beta):

M31 - Andromeda Galaxy Core

M31 - Andromeda Galaxy Core

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

Image Index:

Contribution Index (beta):

M31 - Andromeda Galaxy Core

M31 - Andromeda Galaxy Core

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

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