Area Near M24 (Dave Erickson)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: 13 mu. Sgr · 14 Sgr · 15 Sgr · 16 Sgr · 17 Sgr · 21 Sgr · B304 · B307 · B308 · B92 · B93 · IC 1283 · IC 1284 · IC 4701 · IC 4715 · M 18 · M 24 · NGC 6567 · NGC 6568 · NGC 6578 · NGC 6583 · NGC 6590 · NGC 6595 · NGC 6596 · NGC 6603 · NGC 6613 · NGC 6629 · PK008-02.1 · PK009-02.1 · PK009-04.1 · And 27 more.

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Area Near M24

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Area Near M24

I completed this data set recently. This Image is a composition star field from Stromgren filters StrB, StrY and a red continuum filter. Halpha was then overlayed on an extracted red channel and recombined into an RGB composite color image.

As simple as it sounds it took me quite a while to figure this out. The three filters have bands designed to isolate stars and determine their stellar properties. Band passes for each of the filters are quite different, ~25nm for the Stromgren B&Y and 5nm for red continuum. So spectral maeasurements for the filter pass bands and adjustments to pixel math weighting for each based on flux allowed me to normalize the star field, this seems to have worked.

Original
Final
F

Narrowband imaging
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SoCal Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	3646444
PixInsight job	EJLRCC5LR2JG48WC7CC2HPHB319X5QQC
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h20m11s.90
RA (top/left)	18h11m23s.28
RA (top/right)	18h11m16s.69
RA (bottom/right)	18h29m24s.80
RA (bottom/left)	18h28m43s.37

Dec (center)	-19°48′38″.3
Dec (top/left)	-16°19′54″.6
Dec (top/right)	-23°18′21″.2
Dec (bottom/right)	-23°15′46″.7
Dec (bottom/left)	-16°17′40″.3

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