Stuff I learned today

[nobody]

The desk in the Oval Office was made from wood from a British ship called the HHS Resolute. A British Arctic exploration ship.

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

Of course, each time they modify it, it changes it, so it will likely become the Desk of Theseus

 

[Hardline]

Of course, each time they modify it, it changes it, so it will likely become the Desk of Theseus

As far as I know. It's only been modified once for Herbert Hoover.

 

[JohnnyTheFox]

Today I learned sometimes it's it's better to ask for forgiveness than permission

 

[nobody]

Today I learned sometimes it's it's better to ask for forgiveness than permission

So, if I meet Jerry Jones, I should kick him in the balls and then ask forgiveness rather than ask permission first? Got it!

 

[YosemiteSam]

So, if I meet Jerry Jones, I should kick him in the balls and then ask forgiveness rather than ask permission first? Got it!

That would be a good start, but you should definitely continue those beatings until morale improves around here.

 

[YosemiteSam]

I learned to remove stars from an astrophotography image so you can better edit the nebula (and stars) to make a better overall image.

With and without stars (though these two images are not perfectly aligned as you can probably see in the re-merged version)

The full image with stars added back, though I cropped this image so it doesn't have the clipped Rosette Nebula in the left hand corner.

 

[Runwildboys]

I learned to remove stars from an astrophotography image so you can better edit the nebula (and stars) to make a better overall image.

With and without stars (though these two images are not perfectly aligned as you can probably see in the re-merged version)

The full image with stars added back, though I cropped this image so it doesn't have the clipped Rosette Nebula in the left hand corner.

You didn't take this photo, right?

 

[YosemiteSam]

You didn't take this photo, right?

Yes, I did.

It's a total of six hours of integration (exposure) using a monochrome camera with three different light filters.

These were not taken with RGB wideband filters (Red, Green, and Blue filters), but 3nm narrow band filters. This combination is referred to as the Hubble Palette as many images from the Hubble Telescope were taken using these filters. They mainly used them because much of the gas that nebulas are made of are hydrogen, sulfur, and oxygen! These filters filter all light except these frequencies of light so you get good clean details of the nebula clouds without all the noise of other stray light.

Each exposures was 120 seconds (2 minutes)

I have a total of:

• 3h 20m (100 sub exposures) with a Hydrogen Alpha filter (aka, Ha)
• 80m (40 sub exposures) Sodium 2 filter (aka SII)
• 80m (40 sub exposures) Oyxgen 3 filter (aka OIII)

So, this image is made up of (180) 2-minute sub-exposures merged in using the Hubble Palette color scheme.

 

[Runwildboys]

Yes, I did.

It's a total of six hours of integration (exposure) using a monochrome camera with three different light filters.

These were not taken with RGB wideband filters (Red, Green, and Blue filters), but 3nm narrow band filters. This combination is referred to as the Hubble Palette as many images from the Hubble Telescope were taken using these filters. They mainly used them because much of the gas that nebulas are made of are hydrogen, sulfur, and oxygen! These filters filter all light except these frequencies of light so you get good clean details of the nebula clouds without all the noise of other stray light.

Each exposures was 120 seconds (2 minutes)

I have a total of:

• 3h 20m (100 sub exposures) with a Hydrogen Alpha filter (aka, Ha)
• 80m (40 sub exposures) Sodium 2 filter (aka SII)
• 80m (40 sub exposures) Oyxgen 3 filter (aka OIII)

So, this image is made up of (180) 2-minute sub-exposures merged in using the Hubble Palette color scheme.

Dang, that's a lot of time and effort, but well worth the results! I thought colors in pictures like that were added digitally, which is why I didn't think you'd taken them. Where were you, when you took the picture?

 

[YosemiteSam]

Dang, that's a lot of time and effort, but well worth the results! I thought colors in pictures like that were added digitally, which is why I didn't think you'd taken them. Where were you, when you took the picture?

This one specifically was taking remotely. (You can rent telescopes) This one was taken from Chile in South America.

I used to take a lot of images in the past locally, but I had telescopes that were primarily for visual astronomy and not specifically "Astrographs" which is a telescope made for imaging purposes. Those don't produce the best images and I was young in my astro imaging career back then.

I recently decided to get back into imaging and have started buying new cameras, filters and astrograph telescopes. I have been waiting to buy the camera (it's expensive) until Black Friday. It just arrived, but it's cloudy outside. Hopefully sometime in December I can take my new setup out.

These are my new astrographs.

The bottom one is a Newtonian astrograph, the smaller one above it is a wide-field refractor Astrograph (the image above from Chile was taking with a wide-field astrograph)

This is the monochrome camera with the filter wheel (holds 7 2" filters) and the off-axis guide camera (smaller red camera sticking out of the side of it) The long black nose is what slides down into the telescope. (the imaging end)

So hopefully, I will get to do some local imaging again very soon.

 

[YosemiteSam]

Dang, that's a lot of time and effort, but well worth the results! I thought colors in pictures like that were added digitally, which is why I didn't think you'd taken them. Where were you, when you took the picture?

Oh as for the color. As noted, it was taken with a monochrome camera that has colored filters in front. So I have to merge the images together to create a color image and assign a color to each monochrome image during the merge.

In this case, you assign Red color to Sulfar 2 filter, Green to Hydrogen Alpha filter, and blue to the Oxygen III filter.

The Sun's light is all colors (White) and the sky is blue because the Sun's lights get scattered due to the Rayleigh scattering which produces blue hues due to Oxygen and Nitrogen in the atmosphere. This is why the Oxygen Filter gets blue assigned to it.

This is what a single 2 minute exposure of Hydrogen Alpha looks like from that image. (there are 100 2-minute Ha exposures stacked in that image, plus the Oxygen and Sulfar images)

Once we do get the data and process it. We do mess with the image to bring out the best look and color of it. (Adjusting the histogram and color saturation levels, etc) If you notice from the frame below, I also muted some of the stars in the image above due to how many there were distract away from the Nebula itself. So yes, they do get an artistic touch to the image.

 

[Runwildboys]

This one specifically was taking remotely. (You can rent telescopes) This one was taken from Chile in South America.

I used to take a lot of images in the past locally, but I had telescopes that were primarily for visual astronomy and not specifically "Astrographs" which is a telescope made for imaging purposes. Those don't produce the best images and I was young in my astro imaging career back then.

I recently decided to get back into imaging and have started buying new cameras, filters and astrograph telescopes. I have been waiting to buy the camera (it's expensive) until Black Friday. It just arrived, but it's cloudy outside. Hopefully sometime in December I can take my new setup out.

These are my new astrographs.

The bottom one is a Newtonian astrograph, the smaller one above it is a wide-field refractor Astrograph (the image above from Chile was taking with a wide-field astrograph)

This is the monochrome camera with the filter wheel (holds 7 2" filters) and the off-axis guide camera (smaller red camera sticking out of the side of it) The long black nose is what slides down into the telescope. (the imaging end)

So hopefully, I will get to do some local imaging again very soon.

Where do go, Litchfield County? I imagine there's too much light pollution anywhere near Danbury.

 

[YosemiteSam]

Where do go, Litchfield County? I imagine there's too much light pollution anywhere near Danbury.

I'm a member of the Westport Astronomical Society. So I take many from Westport, CT.

This was a test image from my new astrograph. I didn't have a camera yet, so a fellow Astrophotographer allowed me to use his for a short time just to get an image test on my new astrograph.

This is an unguided short exposer image. So it won't look quite as nice as the other. It has diffraction spikes on the bright stars because it a Newtonian telescope. (it has metal things that hold the secondary mirror in place and show up in the image as diffraction spikes)

So this was taken in Westport.

This is a similar image of the same target (M45, The Pleiades or aka The Seven Sisters) I took from a dark sky with several hours of integration. (the image above is has far less imaging time on it.)

 

[SlammedZero]

Awesome stuff YosemiteSam!!! My bro-in-law is into astrophotography as well. I went over one night and he had his telescope setup with his laptop and we were looking at some amazing things. He, too, has taken some great pics. He has printed some that are amazing. I have one in my house currently. I'll have to snag a picture of it and post it.

 

[YosemiteSam]

Awesome stuff YosemiteSam!!! My bro-in-law is into astrophotography as well. I went over one night and he had his telescope setup with his laptop and we were looking at some amazing things. He, too, has taken some great pics. He has printed some that are amazing. I have one in my house currently. I'll have to snag a picture of it and post it.

Nice! Show us whatcha got!

 

[Runwildboys]

This one specifically was taking remotely. (You can rent telescopes) This one was taken from Chile in South America.

I used to take a lot of images in the past locally, but I had telescopes that were primarily for visual astronomy and not specifically "Astrographs" which is a telescope made for imaging purposes. Those don't produce the best images and I was young in my astro imaging career back then.

I recently decided to get back into imaging and have started buying new cameras, filters and astrograph telescopes. I have been waiting to buy the camera (it's expensive) until Black Friday. It just arrived, but it's cloudy outside. Hopefully sometime in December I can take my new setup out.

These are my new astrographs.

The bottom one is a Newtonian astrograph, the smaller one above it is a wide-field refractor Astrograph (the image above from Chile was taking with a wide-field astrograph)

This is the monochrome camera with the filter wheel (holds 7 2" filters) and the off-axis guide camera (smaller red camera sticking out of the side of it) The long black nose is what slides down into the telescope. (the imaging end)

So hopefully, I will get to do some local imaging again very soon.

Jupiter's going to be in opposition tomorrow. I'd be curious to see what kind of pictures you can get. Good enough to see any of its moons clearly?

 

[SlammedZero]

Nice! Show us whatcha got!

Dang it, I keep forgetting to take a photo and upload it. lol I'll do it this weekend.

 

[Runwildboys]

Thanks to @Tabascocat , I just learned the difference between bison and buffalo.

 

[Runwildboys]

I just learned that the Cowboys' star is the longest tenured, unchanged logo currently in the NFL.

 

[Xelda]

I just learned that the Cowboys' star is the longest tenured, unchanged logo currently in the NFL.

Just confirms that you can't improve perfection.