Trifid Nebula with the Seestar S50 (Nicolas CASTEL)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B85 · HD164384 · HD164402 · HD164492 · HD164514 · HD164637 · HD164704 · HD164717 · HD164739 · HD164833 · HD164844 · HD164864 · HD164883 · LBN 27 · M 20 · M 21 · NGC 6514 · NGC 6531 · Sh2-28 · Sh2-30 · Trifid Nebula

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Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

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

Powered byPixInsight

Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

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

This image was captured with the Seestar "Integrated LP filter engaged". This filter is a Ha Oiii dual band filter, not too much narrow similar to the Zwo DuoBand filter. After stacking in Siril I used a modified version of the DSA-HubbleMatic.ssf script to compute an HXO combination. X being an extra band computed via pixel math from Ha and Oiii bands. The formula used is ((Oiii*Ha)^~(Oiii*Ha))*Ha + ~((Oiii*Ha)^~(Oiii*Ha))*Oiii fomr this article https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/?fbclid=IwAR1_YtLbAGGBoL-N-I7E8vIqsgB4o_mOwOSr-5F7RpXY4zrQzfmsnzB4lYU

The modified script is there : https://github.com/nicastel/Siril-SmartScope-Scripts/blob/main/DSA-HubbleMatic_HXO.ssf
It was used just after the stacking and the crop on the "greenish" image.

Thanks to Juanito Del Pepito on facebook "Fits & Unistellar / Vaonis / Seestar / Dwarf" group for explaining in detail this HXO combination and how to perform it using Siril.

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B

Title: Reprocessed with new tools

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ZWO Seestar S50
Astrophotographes (France)

Seestar S50

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Status	Advanced success
Started	...
Astrometry.net job	9604183
PixInsight job	UDXHZM0072G7K4GF67N2GJZ7K7R2SC4J
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h02m36s.65
RA (top/left)	18h04m59s.99
RA (top/right)	18h02m05s.39
RA (bottom/right)	18h00m12s.79
RA (bottom/left)	18h03m08s.20

Dec (center)	-22°57′34″.9
Dec (top/left)	-22°31′50″.10
Dec (top/right)	-22°16′23″.0
Dec (bottom/right)	-23°23′09″.3
Dec (bottom/left)	-23°38′47″.4

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Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

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Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

Trifid Nebula with the Seestar S50

Revision title: Reprocessed with new tools

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