IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson (Alexandr Zaytsev)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: IC 4706 · IC 4707 · TYC6265-1020-1 · TYC6265-1080-1 · TYC6265-1096-1 · TYC6265-1151-1 · TYC6265-1732-1 · TYC6265-1800-1 · TYC6265-1837-1 · TYC6265-1927-1 · TYC6265-1994-1 · TYC6265-2038-1 · TYC6265-2071-1 · TYC6265-2100-1 · TYC6265-2118-1 · TYC6265-2475-1 · TYC6265-2579-1 · TYC6265-2659-1 · TYC6265-331-1 · TYC6265-615-1 · V1962 Sgr

IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson

Link: https://www.hansonastronomy.com/ic-4707-4706

IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson

Link: https://www.hansonastronomy.com/ic-4707-4706

The IC4706 and IC4707 emission nebula pair that gets passed up for the wonderful M17 most of the time and very rarely imaged in this detail, has a very interesting structure greatly resembling a brain stem - hence the “Brain Stem Nebula”.

This nebula complex is located at a distance of about 5.5 kly at which distance the side of FOV on this image corresponds to 30 ly and the length of the “stem” - to 15 ly. The region also features many small dark nebulae and dark filament structures making it a wonderfully complex scene in the narrowband HOS colors.

Data and initial calibration/integration: Alexandr Zaytsev https://www.astrobin.com/users/m57ring/

ASA Ritchey-Chretien RC-1000: D=1m, f/6.8 on alt-azimuthal direct drive fork mount, FLI ProLine 16803 with secondary mirror based motorized focusing and automatic de-rotation (Telescope #1 system of ChileScope observatory, Río Hurtado Valley, Chile).

11x Ha + 11x OIII + 11x SII guided 1200 sec exposures (11h of combined integral) collected over 9 imaging sessions carried out on Oct 1, 4, 5, 6, 7, 8, 9, 10, 11 of 2023 using Chilescope Telescope #1 system.

Image Processing: Mark Hanson https://www.hansonastronomy.com

Enjoy, Mark and Alex

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Status	Advanced success
Started	...
Astrometry.net job	8629161
PixInsight job	LUHCSAACDESVAUWMJJ3CECCCQCGFLQNH
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h19m40s.414
RA (top/left)	18h19m21s.191
RA (top/right)	18h20m30s.895
RA (bottom/right)	18h19m59s.999
RA (bottom/left)	18h18m49s.856

Dec (center)	-15°59′09″.16
Dec (top/left)	-15°47′00″.30
Dec (top/right)	-15°54′31″.55
Dec (bottom/right)	-16°11′17″.73
Dec (bottom/left)	-16°03′46″.20

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IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson

IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson

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IC4706-4707 The “Brain Stem Nebula” in HOS colors by Zaytsev and Hanson

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