On Dec 5, 2022, at 3:38 PM, Jam Chur <jammeychurch@...> wrote:



The math behind HFR and FWHM is a little beyond my ability to explain but Wikipedia gives a basic overview of the of HFD and HFR  measurements here:

https://en.wikipedia.org/wiki/Half_flux_diameter

For a deeper step through presentation, I found this explanation probably the best effort i've seen:

https://www.youtube.com/watch?v=N60vzaIZq6Y

Yes, the 20x20, 24x24 or 34x34 etc....is the pixel array square used to measure star size in HFR

On Mon, Dec 5, 2022 at 3:17 PM Forrest Erickson <forresterickson@...> wrote:

Regarding HFR readings,

<image.png>

I think the star labled I:8740 (24x24) is the star I had labeled HD25152.

The HFR: 2.24  What are the units?
What is the (24x24) all about?  Is it number of pixels perhaps?

On 12/05/2022 7:44 AM Jam Chur <jammeychurch@...> wrote:

I think you're close on the degrees. I can show you the HFR readings, which I believe both methods (FWHA and HFR) converge to get to the same values. Attached.

<HFR.jpg>

 

The framing and mosaic wizard in SGP can do a single panel, or multiple panels. In this case, it was a single panel used in conjunction with a 36x24mm sensor to frame up the target. In other words, this is a full frame FOV through Duane's NP101 captured across his 36X24mm ASI2400MC-Cool sensor. 

On Sun, Dec 4, 2022 at 3:33 PM FORREST ERICKSON <forresterickson@...> wrote:

Thanks so much.
I have made a post at the Facebook here: 

https://www.facebook.com/groups/117598222298265

Upon reading, "The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro"
I am compelled to ask how many images composed the mosaic. How much bigger than the field of view of a single image is the final image?

Using Cartes du Ciel, I have measured the distance between  and HD25125 as 1 degree 17 minuets.  See below.
Looking at your photo with my fingers as dividers to measure distance I am guessing the size of the image is about 2.25 x 3.25 degrees.
Am I anywhere near correct?

Can you report a spot size (FWHA) for some stars? For example the star HD25152 which I labeled in image below?

Again, Very very nice.
Lee

<image.png>

<image.png>

On 12/03/2022 1:16 PM Jam Chur <jammeychurch@...> wrote:

Hi Forrest,

I've attached another edit incorporating the HA data. I no longer am on Facebook but feel free to take this info and post.  The image was acquired using the following:

Equipment:

Mount: Astro Physics Mach1 Goto 

Scope: Tele Vue NP101

Guide Scope: Svbony 30mm F4 

Camera: ASI2400MC-Cool

Filter : Optolongs Dual Band 3nm HA & OIII filter

Acquisition details

Polar Alignment was accomplished using the QHY Polemaster. Focus was achieved utilizing a Feather touch focus motor within Sharpcap.  

The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro. The sequence details were set in Sequence Generator Pro at 42 -  10 minute subs and ran from approx 8PM - 4:30AM on 12/1/22.. Auto meridian flip was set in Sequence Generator Pro.  

Gain: Unity @ 0 degrees

Subs: 42 subs @ 10 minutes ea

Darks: 10

Flats: 40

Processing

• The lights, darks, and flats were loaded into Deep Sky Stacker to create the stack
• The stack was processed in Pixilnsight: Linerfit, Dynamic Background Extraction, and then stretched
• The stretched file was opened in Photoshop and edited to taste.
• The HA edit and OIII edits were then combined in Photoshop and then saved

<CN JPEG.jpg>

On Sat, Dec 3, 2022 at 11:52 AM Forrest Erickson <forresterickson@...> wrote:

Nice image guys.

Are either of you able to put in and a description of equipment and techniques on our FaceBook Pages?

On 12/03/2022 10:03 AM Duane Dunlap <lddunlap41@...> wrote:

Begin forwarded message:

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap

<California Nebula.jpg>

On 12/05/2022 7:44 AM Jam Chur <jammeychurch@...> wrote:

I think you're close on the degrees. I can show you the HFR readings, which I believe both methods (FWHA and HFR) converge to get to the same values. Attached.
 

The framing and mosaic wizard in SGP can do a single panel, or multiple panels. In this case, it was a single panel used in conjunction with a 36x24mm sensor to frame up the target. In other words, this is a full frame FOV through Duane's NP101 captured across his 36X24mm ASI2400MC-Cool sensor. 

On Sun, Dec 4, 2022 at 3:33 PM FORREST ERICKSON <forresterickson@...> wrote:

Thanks so much.
I have made a post at the Facebook here: 

https://www.facebook.com/groups/117598222298265

Upon reading, "The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro"
I am compelled to ask how many images composed the mosaic. How much bigger than the field of view of a single image is the final image?

Using Cartes du Ciel, I have measured the distance between  and HD25125 as 1 degree 17 minuets.  See below.
Looking at your photo with my fingers as dividers to measure distance I am guessing the size of the image is about 2.25 x 3.25 degrees.
Am I anywhere near correct?

Can you report a spot size (FWHA) for some stars? For example the star HD25152 which I labeled in image below?

Again, Very very nice.
Lee

On 12/03/2022 1:16 PM Jam Chur <jammeychurch@...> wrote:

Hi Forrest,

I've attached another edit incorporating the HA data. I no longer am on Facebook but feel free to take this info and post.  The image was acquired using the following:

Equipment:

Mount: Astro Physics Mach1 Goto 

Scope: Tele Vue NP101

Guide Scope: Svbony 30mm F4 

Camera: ASI2400MC-Cool

Filter : Optolongs Dual Band 3nm HA & OIII filter

Acquisition details

Polar Alignment was accomplished using the QHY Polemaster. Focus was achieved utilizing a Feather touch focus motor within Sharpcap.  

The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro. The sequence details were set in Sequence Generator Pro at 42 -  10 minute subs and ran from approx 8PM - 4:30AM on 12/1/22.. Auto meridian flip was set in Sequence Generator Pro.  

Gain: Unity @ 0 degrees

Subs: 42 subs @ 10 minutes ea

Darks: 10

Flats: 40

Processing

• The lights, darks, and flats were loaded into Deep Sky Stacker to create the stack
• The stack was processed in Pixilnsight: Linerfit, Dynamic Background Extraction, and then stretched
• The stretched file was opened in Photoshop and edited to taste.
• The HA edit and OIII edits were then combined in Photoshop and then saved

On Sat, Dec 3, 2022 at 11:52 AM Forrest Erickson <forresterickson@...> wrote:

Nice image guys.

Are either of you able to put in and a description of equipment and techniques on our FaceBook Pages?

On 12/03/2022 10:03 AM Duane Dunlap <lddunlap41@...> wrote:

Begin forwarded message:

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap

On Dec 4, 2022, at 3:33 PM, Forrest Erickson <forresterickson@...> wrote:



Thanks so much.
I have made a post at the Facebook here: 

https://www.facebook.com/groups/117598222298265

Upon reading, "The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro"
I am compelled to ask how many images composed the mosaic. How much bigger than the field of view of a single image is the final image?

Using Cartes du Ciel, I have measured the distance between  and HD25125 as 1 degree 17 minuets.  See below.
Looking at your photo with my fingers as dividers to measure distance I am guessing the size of the image is about 2.25 x 3.25 degrees.
Am I anywhere near correct?

Can you report a spot size (FWHA) for some stars? For example the star HD25152 which I labeled in image below?

Again, Very very nice.
Lee

<image.png>

<image.png>

On 12/03/2022 1:16 PM Jam Chur <jammeychurch@...> wrote:

Hi Forrest,

I've attached another edit incorporating the HA data. I no longer am on Facebook but feel free to take this info and post.  The image was acquired using the following:

Equipment:

Mount: Astro Physics Mach1 Goto 

Scope: Tele Vue NP101

Guide Scope: Svbony 30mm F4 

Camera: ASI2400MC-Cool

Filter : Optolongs Dual Band 3nm HA & OIII filter

Acquisition details

Polar Alignment was accomplished using the QHY Polemaster. Focus was achieved utilizing a Feather touch focus motor within Sharpcap.  

The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro. The sequence details were set in Sequence Generator Pro at 42 -  10 minute subs and ran from approx 8PM - 4:30AM on 12/1/22.. Auto meridian flip was set in Sequence Generator Pro.  

Gain: Unity @ 0 degrees

Subs: 42 subs @ 10 minutes ea

Darks: 10

Flats: 40

Processing

• The lights, darks, and flats were loaded into Deep Sky Stacker to create the stack
• The stack was processed in Pixilnsight: Linerfit, Dynamic Background Extraction, and then stretched
• The stretched file was opened in Photoshop and edited to taste.
• The HA edit and OIII edits were then combined in Photoshop and then saved

<CN JPEG.jpg>

On Sat, Dec 3, 2022 at 11:52 AM Forrest Erickson <forresterickson@...> wrote:

Nice image guys.

Are either of you able to put in and a description of equipment and techniques on our FaceBook Pages?

On 12/03/2022 10:03 AM Duane Dunlap <lddunlap41@...> wrote:

Begin forwarded message:

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap

<California Nebula.jpg>

On 12/03/2022 1:16 PM Jam Chur <jammeychurch@...> wrote:

Hi Forrest,

I've attached another edit incorporating the HA data. I no longer am on Facebook but feel free to take this info and post.  The image was acquired using the following:

Equipment:

Mount: Astro Physics Mach1 Goto 

Scope: Tele Vue NP101

Guide Scope: Svbony 30mm F4 

Camera: ASI2400MC-Cool

Filter : Optolongs Dual Band 3nm HA & OIII filter

Acquisition details

Polar Alignment was accomplished using the QHY Polemaster. Focus was achieved utilizing a Feather touch focus motor within Sharpcap.  

The session was created in Sequence Generator Pro using the framing and mosaic wizard with plate solving configured in Sequence Generator Pro. The sequence details were set in Sequence Generator Pro at 42 -  10 minute subs and ran from approx 8PM - 4:30AM on 12/1/22.. Auto meridian flip was set in Sequence Generator Pro.  

Gain: Unity @ 0 degrees

Subs: 42 subs @ 10 minutes ea

Darks: 10

Flats: 40

Processing

• The lights, darks, and flats were loaded into Deep Sky Stacker to create the stack
• The stack was processed in Pixilnsight: Linerfit, Dynamic Background Extraction, and then stretched
• The stretched file was opened in Photoshop and edited to taste.
• The HA edit and OIII edits were then combined in Photoshop and then saved

On Sat, Dec 3, 2022 at 11:52 AM Forrest Erickson <forresterickson@...> wrote:

Nice image guys.

Are either of you able to put in and a description of equipment and techniques on our FaceBook Pages?

On 12/03/2022 10:03 AM Duane Dunlap <lddunlap41@...> wrote:

Begin forwarded message:

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap

On 12/03/2022 10:03 AM Duane Dunlap <lddunlap41@...> wrote:

Begin forwarded message:

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap

From: Duane Dunlap <lddunlap41@...>
Date: December 3, 2022 at 9:32:21 AM EST
To: smokymtnastro@...
Subject: California Nebula

To All, attached is a photo taken by SMAS member, Jammey Church, using my telescope, mount and camera. The picture is composed of 7 1/2 hours of 10 minute subs and processed with PixInsight. I helped with the final processing. Jammey is helping me consolidate wiring and updating my components.   Duane Dunlap