M22 (Wei-Hao Wang)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: HD171495 · HD171524 · HD171572 · HD171612 · M 22 · NGC 6656 · PK009-07.1

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M22

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M22

LRGB composition. L taken under a seeing that's slightly worse than 1".

Rev.C is an H-R diagram generated using the central 39 thousands of stars (within R<0.15 deg) of the cluster. One can clearly see the main sequence, asymptotic giant branch, and the blue stragglers. The magnitudes are calibrated with the APASS catalog, whose quality is doubtful in this crowded area. So I am not extremely confident about the absolute calibration. The whole diagram may be shifted (both horizontally and vertically) by perhaps 0.1 or even 0.2 magnitudes, but it should not be stretched.

For the whole image, there are about 200 thousand stars detected in the B filter. It could be more in the V filter, or much more if a very aggressive star detection is applied.

Final
Original
C

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Status	Advanced success
Started	...
Astrometry.net job	8040305
PixInsight job	TLBKOBLUGXR94N5HPFMMAO399WHCHBYF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h36m24s.213
RA (top/left)	18h37m57s.984
RA (top/right)	18h34m50s.840
RA (bottom/right)	18h34m49s.988
RA (bottom/left)	18h37m57s.895

Dec (center)	-23°54′15″.22
Dec (top/left)	-23°38′13″.97
Dec (top/right)	-23°38′04″.96
Dec (bottom/right)	-24°10′11″.29
Dec (bottom/left)	-24°10′20″.58

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