The Andromeda Galaxy (pterodattilo)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: Andromeda Galaxy · M 110 · M 31 · M 32 · NGC 205 · NGC 221 · NGC 224

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The Andromeda Galaxy

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The Andromeda Galaxy

While taking frames for this subject, I made a mistake. I was in a hurry and I used the wrong (L-Enhance) filter for two nights: almost 10 hours of frames done with the wrong exposure on the wrong subject.

After having managed to have some 10 hours with a broadband CLS filter, I tried several ways not to waste my narrowband efforts: I extracted the red channel, stacked the frames, and tried to merge with narrowband data in several ways but without any success.

It turned out that the easiest way to use narrowband data (actually: the only one that gave me a satisfying result) was to make a huge stack of all the frames. SubframeSelector gave narrowband frames a low weight but the influence of including them in the stacking is clearly visible in the HII regions of the galaxy. Without these frames, there were barely noticeable, now they appear with the "right" relevance to my eyes.

*November 2021 update*: I finally succeed in combining them. Broadband data has been processed until color calibration, then I mixed HA into the R channel of the image and went on processing. HA data were taken from R channel of L-Enhance

Original
B
C
D
Final
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B

Description: One year later: improved processing skills and a better combination of narrow and broadband data

Uploaded: ...

F

Description: color balance is better and ha regions more visible, this thanks to an alternate techinique (wrt Keller's book) to mix HA and RGB in galaxies (http://www.arciereceleste.it/tutorial-pixinsight/cat-tutorial-eng/85-enhance-galaxy-ha-eng)

Uploaded: ...

Light Polluted skies
CMOS Imagers
Cloudy Nights
Imaged with APT
Narrowband imaging
Imagers of Italy

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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.
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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	Basic success
Started	...
Astrometry.net job	5582725
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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The Andromeda Galaxy

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Image Index:

Contribution Index (beta):

The Andromeda Galaxy

The Andromeda Galaxy

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Acquisition details

Description

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F

Sky plot

Histogram

In these public groups

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