Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO (Daniel.P)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1805 · Sh2-190

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Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Powered byPixInsight

Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

This image results from exposures spanning over 8 nights : 14, 15, 16, 17, 188, 19, 20 & 22 of september. As the nights were getting longer in september, I let the scope point to this nice area of the sky during the second half of the night.

Despite the nearly full moon shinning, the NB filters did a nice job. However, flats correction was needed to calibrate SHO frames! This is not necessary (with my equipment) on moonless night.

The cooling of the sensor varied at -12C, -15C & -21C, depending on the outside temperature.

The RGB exposures were only used to give a natural color to the stars.

The processing was performed in PI as follows :

For each S, H, O, R, G, B channels :

- Images Calibration (Dark Substraction)

- Cosmetic Correction

- Image Registration

- Image Integration

- Mure Denoise (for SHO only)

Then :

- Create a super Lum image from S, H & O channels (weights estimated using PI integration on S H O images before noise reduction : 1.0 for Ha, 0.1 for O3 & S2.

- Deconvolution of super Lum masked with 2.3 pixel psf

- Create SHO image using LRGB

- Color balance on nebula and color saturation using mask to protect dark area.

- Create RGB image and color balance and color sat (to be used to color stars in SHO)

- SCNR (G neutral and min)

- Background extraction

- Going NL using HT for SHO & RGB images

- Color Saturation masked (and desaturate bkg)

- Color Saturation masked using stars to desaturate stars

- Apply "a" & "b" color channels of the RGB image under star mask

(this is to apply natural color to the stars)

- Local Histogram Equalisation

- TGV denoise (no mask)

Final image adjustments performed in Iphoto on Imac :

- levels adjustments

- adjust color looking using "selective color"

- boost sharpness

- deflip

- crop

Sharpless2 Objects

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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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Status	Advanced success
Started	...
Astrometry.net job	3003196
PixInsight job	21OR4RX1F5GO821X9F1AIY75G6D7TQ40
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h33m08s.986
RA (top/left)	02h38m06s.647
RA (top/right)	02h28m12s.300
RA (bottom/right)	02h28m19s.210
RA (bottom/left)	02h37m57s.553

Dec (center)	+61°26′54″.97
Dec (top/left)	+61°52′59″.48
Dec (top/right)	+61°53′07″.69
Dec (bottom/right)	+61°00′10″.40
Dec (bottom/left)	+61°00′02″.83

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Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

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Image Index:

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Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

Open Cluster Melotte 15 in Cassiopeia - sh2-190 / IC1805 - SHO

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Acquisition details

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