The Rosette Nebula in H-alpha and Oxygen III Light. (Anders Johannesson)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: 12 Mon · LBN 941 · LBN 948 · LBN 949 · NGC 2237 · NGC 2238 · NGC 2239 · NGC 2244 · NGC 2246 · Rosette A · Rosette B · Rosette Nebula · Sh2-275 · The star 12Mon

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The Rosette Nebula in H-alpha and Oxygen III Light.

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The Rosette Nebula in H-alpha and Oxygen III Light.

The Rosette nebula, located 5200 light years from us, is an HII region in Monoceros. It has a lot of structure and ongoing star formation that is interesting to explore. The details are especially prominent if imaged with narrowband H-alpha and Oxygen III filters, like in this image. H-alpha is here coded in a brownish tone and Oxygen III in a blue tone. So colors are not natural.

I took a picture of the same object about 2 years ago, but at that time I had my old Sony a7s camera without IR-CUT filter modification, so it blocked most of the H-alpha light. This time I used my rather new B/W ASI2600 camera instead, without any H-alpha blocking. The H-alpha filter I used at that time was 12 nm wide, but this time it is more narrow, 3 nm. Even if I now use only half of the exposure time and use more narrow filters, I still get a much better image. I really enjoy the difference. So far, switching to a B/W sensor with filter wheel, has been really awarding. It is a BIG difference.

Imaged with N.I.N.A.
"Nordish by nature"
Narrowband imaging
ZWO ASI2600MM Pro

Narrowband

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Status	Advanced success
Started	...
Astrometry.net job	5510733
PixInsight job	RKEOTAORCPS7R0WEUL9PK9E5TXV9AN0N
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h32m06s.25
RA (top/left)	06h27m28s.73
RA (top/right)	06h32m54s.26
RA (bottom/right)	06h36m43s.77
RA (bottom/left)	06h31m18s.15

Dec (center)	+04°56′25″.6
Dec (top/left)	+05°02′19″.3
Dec (top/right)	+03°48′02″.2
Dec (bottom/right)	+04°50′20″.6
Dec (bottom/left)	+06°04′45″.2

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The Rosette Nebula in H-alpha and Oxygen III Light.

The Rosette Nebula in H-alpha and Oxygen III Light.

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The Rosette Nebula in H-alpha and Oxygen III Light.

The Rosette Nebula in H-alpha and Oxygen III Light.

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