M41 (Little Beehive Cluster) (Joon Ren)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: 12 CMa · HD48220 · HD48315 · HD48375 · HD48376 · HD48482 · HD48521 · HD48538 · HD48539 · HD48557 · HD48574 · HD48600 · HD48813 · HD48852 · HD48873 · HD48983 · HD48984 · HD49023 · HD49049 · HD49050 · HD49068 · HD49069 · HD49091 · HD49105 · HD49106 · HD49125 · HD49126 · HD49151 · HD49183 · HD49212 · And 18 more.

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M41 (Little Beehive Cluster)

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M41 (Little Beehive Cluster)

Visual observers tend to see curved lines in this cluster which is where it probably got its name. M41 covers the size of a full moon and lies fairly close to Sirius, the brightest star visible from Earth.

I just had to image this target as its one of my favorite clusters when observing. Calibration flats did not work properly so I had to make use of a synthetic flat between stacking and linear processing.

This cluster has an unusually large number of binaries (dual star systems) which I only realized after a saturation curve. The most obvious one is about 8 o’clock off the cluster's center where a blue and yellow star are touching each other. After checking Stellarium though, it seems all of the stars with mixed yellow-blue (paler yellow) colours are also binaries. Plus a few more which aren't distinguishable by colour. Apparently that's how spectroscopic binaries are found; through analysis of their light.

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Cloudy Nights

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Status	Advanced success
Started	...
Astrometry.net job	7063011
PixInsight job	NV1BGGL9DGOB1FDGWL05C4SQ18HPGHJL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h46m09s.11
RA (top/left)	06h42m32s.36
RA (top/right)	06h40m59s.99
RA (bottom/right)	06h49m50s.27
RA (bottom/left)	06h51m12s.57

Dec (center)	-20°44′03″.5
Dec (top/left)	-19°04′24″.8
Dec (top/right)	-22°09′43″.5
Dec (bottom/right)	-22°23′25″.10
Dec (bottom/left)	-19°17′51″.6

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M41 (Little Beehive Cluster)

M41 (Little Beehive Cluster)

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M41 (Little Beehive Cluster)

M41 (Little Beehive Cluster)

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