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Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front. I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image. The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image. Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel. https://astrob.in/ox98cs/0/I hope you like it! Luca
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I usually sit in the back of the class, observing and mostly quiet, but I couldn't let this one pass without praising this accomplishment.
Your dedication has produced an outstanding image.
My best regards,
dan kowall
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Stuart
Simply incredible Luca!!!!! Words fail me.
Stuart
On Sun, Dec 18, 2022 at 11:36 AM Luca Marinelli < photo@...> wrote: Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Dean Jacobsen
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Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli < photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front. I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image. The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image. Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel. https://astrob.in/ox98cs/0/I hope you like it! Luca
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Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
Luca
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On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli < photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow
star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this
target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many
false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen
across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Interesting image indeed. Never seen or even heard of this nebula before. Your widefield did a great job capturing it. -Steve
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Luca Marinelli Sent: Sunday, December 18, 2022 5:12 PM To: main@ap-gto.groups.io Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli <photo@...> wrote: Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Awesome image. That's dedication!
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Show quoted text
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Luca Marinelli <photo@...>
Sent: Sunday, December 18, 2022 2:12 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
Luca
On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli < photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow
star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this
target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many
false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen
across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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most excellent !
-- benoit
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On Sun, Dec 18, 2022 at 3:41 PM Bill Long <bill@...> wrote:
Awesome image. That's dedication!
________________________________
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Luca Marinelli <photo@...>
Sent: Sunday, December 18, 2022 2:12 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
Luca
On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli <photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Steve, Bill, and Benoit,
Thank you very much!
Steve, as far as I know there is one professional image of HDW3 and less than a dozen amateur ones. JB Auroux selected an image of HDW3 recently on Photon Millennium and has a great write-up on the astrophysics of this planetary nebula:
Luca
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On Dec 19, 2022, at 1:34 AM, Benoit Schillings via groups.io <benoit.schillings@...> wrote:
most excellent !
-- benoit
On Sun, Dec 18, 2022 at 3:41 PM Bill Long <bill@...> wrote:
Awesome image. That's dedication!
________________________________
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Luca Marinelli <photo@...>
Sent: Sunday, December 18, 2022 2:12 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
Luca
On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli <photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright
central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the
extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging
image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small
background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Thanks Luca, I’ll look into this more. It looks like a real challenging object to image and hopefully a target once I get a widefield setup up and running. Thanks again for posting the image and information. -Steve
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Luca Marinelli Sent: Monday, December 19, 2022 9:25 AM To: main@ap-gto.groups.io Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula Steve, as far as I know there is one professional image of HDW3 and less than a dozen amateur ones. JB Auroux selected an image of HDW3 recently on Photon Millennium and has a great write-up on the astrophysics of this planetary nebula: most excellent !
-- benoit
On Sun, Dec 18, 2022 at 3:41 PM Bill Long <bill@...> wrote:
Awesome image. That's dedication!
________________________________
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Luca Marinelli <photo@...>
Sent: Sunday, December 18, 2022 2:12 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Thank you very much to all of you! It has been a challenging project and am glad to put a bow on it and move to something a bit brighter.
Luca
On Dec 18, 2022, at 2:13 PM, Donald Brannan via groups.io <dbrannan0523@...> wrote:
Ditto DK 10:57 comments. Wow!
On Dec 18, 2022, at 10:36 AM, Luca Marinelli <photo@...> wrote:
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
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Karen Christen
Wow, Luca. That’s a really impressive result. You’re a patient guy!
Karen
AP
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From: main@ap-gto.groups.io <main@ap-gto.groups.io>
On Behalf Of Luca Marinelli
Sent: Sunday, December 18, 2022 10:37 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central
yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this
target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many
false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen
across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
-- Karen ChristenAstro-Physics
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Intriguing image. Congrats on getting this difficult object.
Rolando
-----Original Message-----
From: Luca Marinelli <photo@...>
To: main@ap-gto.groups.io
Sent: Sun, Dec 18, 2022 10:36 am
Subject: [ap-gto] HDW 3: an exceedingly faint ancient planetary nebula
Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.
I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours. It was a very challenging image to process. I had many false starts in PixInsight but tools like NoiseXTerminator, StarXTerminator, SPCC for narrowband images, GHS made a big difference in handling noise and color in the image.
The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband ones. Small background galaxies can be seen across the image.
Data was collected in my backyard observatory on the trusty AP1100GTO with a TS ONTC 10in f4 Newtonian, TeleVue Paracorr Type 2, QHY 268M, and Astrodon 3nm Ha/OIII filters. Image scale is 0.67 arc-sec/pixel.
https://astrob.in/ox98cs/0/
I hope you like it!
Luca
-- Roland Christen Astro-Physics
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