M1 Crab Nebula in HOO (Aaron Freimark)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: Crab nebula · M 1 · NGC 1952 · Sh2-244

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M1 Crab Nebula in HOO

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M1 Crab Nebula in HOO

What happens when a star explodes? This star exploded nearly 1,000 years ago, as observed by Chinese astronomers in 1054. Today we can see the remnants of the supernova from Earth, expanding at 930 miles per second. At the center of this is the leftover bits of the star, compressed into a ball only 20 miles in diameter, and spinning at the crazy rate of 30 revolutions per second.

This is the Crab Nebula, also called M1. If I were in charge of naming things I'd call it the "Space Brains Nebula." Alas, when William Parsons observed it in 1840, he "produced a drawing that looked somewhat like a crab."

The image came out much better than I expected, with 38 5-minute exposures.

1. WeightedBatchProcessing, Subframe Selector, Star Alignment, Local Normalization, Image Integration, Drizzle Integration, Dynamic Crop

2. Dynamic Background Extraction

3. EZ Decon on both — had a big effect.

4. EZ Denoise

5. Arcsinhstretch

6. StarNet++ to remove stars and create a star mask on both images

7. Combine star images with R: Ha, G: 0.4*OIII + 0.6*Ha, B: OIII

8. Use Clone Stamp to remove some artifacts from the nebula portion of the star image

9. Combine starless images with R: Ha, G: 0.8*OIII + 0.2*Ha, B: OIII

10. CurvesTransformation on starless

11. Very slight Unsharp Mask on starless

12. PixelMath to combine stars & starless: K: 1-((1-stars)*(1-HOO))

Original
Final
B

B

Description: Brightened

Uploaded: ...

INDI Users
Mid-Hudson Astronomical Association (MHAA)
Northeast Imagers

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Status	Advanced success
Started	...
Astrometry.net job	4304954
PixInsight job	WIOOVJN41U2R5PUN90815Z0YT5MVIZ2S
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h34m33s.90
RA (top/left)	05h33m39s.82
RA (top/right)	05h33m34s.57
RA (bottom/right)	05h35m27s.77
RA (bottom/left)	05h35m33s.50

Dec (center)	+22°01′09″.10
Dec (top/left)	+22°17′50″.8
Dec (top/right)	+21°45′31″.3
Dec (bottom/right)	+21°44′28″.6
Dec (bottom/left)	+22°16′48″.8

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M1 Crab Nebula in HOO

M1 Crab Nebula in HOO

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M1 Crab Nebula in HOO

M1 Crab Nebula in HOO

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Description

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