Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only (Alexandr Zaytsev)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B304 · B307 · B92 · B93 · IC 4715 · LBN 51 · LBN 52 · LDN 322 · LDN 323 · LDN 327 · LDN 328 · LDN 331 · LDN 335 · LDN 336 · M 18 · M 24 · NGC 6567 · NGC 6603 · NGC 6613 · PGC 202099 · PGC 202315 · Sh2-39 · Sh2-40 · Sh2-41 · Sh2-43 · Small Sgr Star Cloud · VdB117

Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

Link: https://coalsack.online/chilescope/Sgr_T5_31x300s_HOS_m5b_at.jpg

Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

Link: https://coalsack.online/chilescope/Sgr_T5_31x300s_HOS_m5b_at.jpg

2h 35min integral Ha, Oiii. Sii exposure of M24 all dark nebulae and star clusters within it, captured remotely using Telescope #5 (Officina Stellare Riccardi-Honders RH200 D = 200mm f/3, FLI Microline 16200) system of ChileScope observatory; over 5 observation sessions carried out on Oct 1, 16, 17, 18, 19, 2022.

The Ha, Oiii. Sii exposures are split 3 ways:

- Ha only (revision B),
- HOS mapped to RGB photometrically calibrated using PixInsight tools,
- HSO mapped to RGB photometrically calibrated using PixInsight tools,

all processed separately and merged together for final calibration in Photoshop.

The wider angle view to the region is also available under [1]:

[1] https://www.astrobin.com/1pe41m/C/

Final
Original
B

B

Title: Ha version of the image (based on 10x 300s subset of exposures)

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6463394
PixInsight job	BMU43162DAQUUJ54PZ7YQPRQZ419G6K0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h16m04s.99
RA (top/left)	18h11m57s.28
RA (top/right)	18h11m59s.18
RA (bottom/right)	18h20m15s.95
RA (bottom/left)	18h20m07s.87

Dec (center)	-18°13′36″.6
Dec (top/left)	-17°03′38″.4
Dec (top/right)	-19°24′19″.2
Dec (bottom/right)	-19°23′17″.2
Dec (bottom/left)	-17°02′47″.4

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Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

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Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

Dark Nebulae in the Sagittarius Star Cloud in HOS colors and Ha only

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