On Thu, Feb 20, 2025 at 21:59, Myron Wasiuta via groups.io

<myrnteryx4@...> wrote:

Dear RAC and CAS,

I created an interesting animation showing what I believe are true changes in the appearance of the Crab Nebula over a span of about 9 years. The first image was taken in February 2016 and the second image was taken in January 2025. I had to scale the images to the same size, and manually do a 2-star alignment to compensate for the different image scales. Fortunately the orientation was nearly the same so this went well. The first image was taken using a Meade 12" LX-200 at about f6.5 and using an ATIK-314E CCD camera with no filter. It is a stack of 10 120-second exposures. The 2025 image was taken using a 10" f7.9 R-C and QHY 294 M Pro CMOS camera with no filter. It is a stack of 10 60-second exposures.

I believe the images show apparent changes in the synchrotron radiation glow of the nebula as well as a subtle expansion of the nebula itself! In addition there is a high proper motion star (UCAC4-561-018089) at the lower left part of the frame that can be seen drifting south in declination about 2 arc-seconds. According to Cartes du Ceil-it has an annual proper motion of about 241 milli-arcseconds /year.? There also appears to be a possible variable at the top right part of the frame.

I probably should have labelled each image with the year. The 2025 image is the one with the high proper motion star in its "up " position.

Myron Wasiuta

On Feb 21, 2025, at 6:56?AM, Carl Darron via groups.io <an-hour-a-week@...> wrote:

?Myron,

What app do you use to play the simulation?

Vr/ Carl Darron?

On Thu, Feb 20, 2025 at 21:59, Myron Wasiuta via groups.io

<myrnteryx4@...> wrote:

Dear RAC and CAS,

I created an interesting animation showing what I believe are true changes in the appearance of the Crab Nebula over a span of about 9 years. The first image was taken in February 2016 and the second image was taken in January 2025. I had to scale the images to the same size, and manually do a 2-star alignment to compensate for the different image scales. Fortunately the orientation was nearly the same so this went well. The first image was taken using a Meade 12" LX-200 at about f6.5 and using an ATIK-314E CCD camera with no filter. It is a stack of 10 120-second exposures. The 2025 image was taken using a 10" f7.9 R-C and QHY 294 M Pro CMOS camera with no filter. It is a stack of 10 60-second exposures.

I believe the images show apparent changes in the synchrotron radiation glow of the nebula as well as a subtle expansion of the nebula itself! In addition there is a high proper motion star (UCAC4-561-018089) at the lower left part of the frame that can be seen drifting south in declination about 2 arc-seconds. According to Cartes du Ceil-it has an annual proper motion of about 241 milli-arcseconds /year.? There also appears to be a possible variable at the top right part of the frame.

I probably should have labelled each image with the year. The 2025 image is the one with the high proper motion star in its "up " position.

Myron Wasiuta

On Fri, Feb 21, 2025 at 8:03, Myron Wasiuta via groups.io

<myrnteryx4@...> wrote:

Carl,

I use Windows Media Player on my desktop. If anyone is having trouble opening the avi file, I will send out an mp4 version later tonight once I get a chance to work with it.?

Myron?

On Feb 21, 2025, at 6:56?AM, Carl Darron via groups.io <an-hour-a-week@...> wrote:

?Myron,

What app do you use to play the simulation?

Vr/ Carl Darron?

On Thu, Feb 20, 2025 at 21:59, Myron Wasiuta via groups.io

<myrnteryx4@...> wrote:

Dear RAC and CAS,

I created an interesting animation showing what I believe are true changes in the appearance of the Crab Nebula over a span of about 9 years. The first image was taken in February 2016 and the second image was taken in January 2025. I had to scale the images to the same size, and manually do a 2-star alignment to compensate for the different image scales. Fortunately the orientation was nearly the same so this went well. The first image was taken using a Meade 12" LX-200 at about f6.5 and using an ATIK-314E CCD camera with no filter. It is a stack of 10 120-second exposures. The 2025 image was taken using a 10" f7.9 R-C and QHY 294 M Pro CMOS camera with no filter. It is a stack of 10 60-second exposures.

I believe the images show apparent changes in the synchrotron radiation glow of the nebula as well as a subtle expansion of the nebula itself! In addition there is a high proper motion star (UCAC4-561-018089) at the lower left part of the frame that can be seen drifting south in declination about 2 arc-seconds. According to Cartes du Ceil-it has an annual proper motion of about 241 milli-arcseconds /year.? There also appears to be a possible variable at the top right part of the frame.

I probably should have labelled each image with the year. The 2025 image is the one with the high proper motion star in its "up " position.

Myron Wasiuta

On Feb 21, 2025, at 08:03, Myron Wasiuta via groups.io <myrnteryx4@...> wrote:

?

Carl,

I use Windows Media Player on my desktop. If anyone is having trouble opening the avi file, I will send out an mp4 version later tonight once I get a chance to work with it.?

Myron?

On Feb 21, 2025, at 6:56?AM, Carl Darron via groups.io <an-hour-a-week@...> wrote:

?Myron,

What app do you use to play the simulation?

Vr/ Carl Darron?

On Thu, Feb 20, 2025 at 21:59, Myron Wasiuta via groups.io

<myrnteryx4@...> wrote:

Dear RAC and CAS,

I created an interesting animation showing what I believe are true changes in the appearance of the Crab Nebula over a span of about 9 years. The first image was taken in February 2016 and the second image was taken in January 2025. I had to scale the images to the same size, and manually do a 2-star alignment to compensate for the different image scales. Fortunately the orientation was nearly the same so this went well. The first image was taken using a Meade 12" LX-200 at about f6.5 and using an ATIK-314E CCD camera with no filter. It is a stack of 10 120-second exposures. The 2025 image was taken using a 10" f7.9 R-C and QHY 294 M Pro CMOS camera with no filter. It is a stack of 10 60-second exposures.

I believe the images show apparent changes in the synchrotron radiation glow of the nebula as well as a subtle expansion of the nebula itself! In addition there is a high proper motion star (UCAC4-561-018089) at the lower left part of the frame that can be seen drifting south in declination about 2 arc-seconds. According to Cartes du Ceil-it has an annual proper motion of about 241 milli-arcseconds /year.? There also appears to be a possible variable at the top right part of the frame.

I probably should have labelled each image with the year. The 2025 image is the one with the high proper motion star in its "up " position.

Myron Wasiuta