Comments and questions about the
APOD on the main view screen.
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FLPhotoCatcher
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by FLPhotoCatcher » Wed Sep 21, 2022 4:23 am
Did someone photoshop out a couple of UFOs on the left?
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Joe45
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by Joe45 » Wed Sep 21, 2022 8:03 am
When did Hubble start operating in the infrared ?
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heehaw
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by heehaw » Wed Sep 21, 2022 9:17 am
After seeing bazillion photos of Horsehead ... this is the best ever!
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MightyOg
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by MightyOg » Wed Sep 21, 2022 10:51 am
...and suddenly I see the Martian from George Pal's 'War of the Worlds.'
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orin stepanek
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by orin stepanek » Wed Sep 21, 2022 12:08 pm
A nice annotated view of the Orion Constellation!
I thought this photo showed up before! Still worth a look!
Who needs a paper shredder when you have a dog!
Orin
Smile today; tomorrow's another day!
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orin stepanek
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by orin stepanek » Wed Sep 21, 2022 1:07 pm
Oh yeah; Happy 23rd Hubble Space Telescope! Thanks for all the Space views!
Orin
Smile today; tomorrow's another day!
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bystander
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by bystander » Wed Sep 21, 2022 2:02 pm
Joe45 wrote: ↑Wed Sep 21, 2022 8:03 am
When did Hubble start operating in the infrared ?
Hubble can see from 0.1 to 2.5 microns, so it operates from ultraviolet to near infrared.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor
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Chris Peterson
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by Chris Peterson » Wed Sep 21, 2022 2:30 pm
Joe45 wrote: ↑Wed Sep 21, 2022 8:03 am
When did Hubble start operating in the infrared ?
Near-IR extends out to around 2 micrometers, where we're still seeing what we might think of as ordinary light. Uncooled silicon sensors such as those on the HST can be used to that wavelength (and the HST has filters out that far). Longer than that and we're either seeing thermal emissions or highly redshifted light. For that you need cooled sensors made of more exotic materials. That's what we're now seeing from the JWST.
At the near-IR wavelengths Hubble can detect, we're mostly seeing IR used to cut through dust that is opaque at shorter wavelengths.
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De58te
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by De58te » Wed Sep 21, 2022 4:54 pm
Orin Stepanek wrote, "I thought this photo showed up before."
Yup, searching APOD for Horsehead In Infrared Hubble, I found 3 entries before, on Apr 12 2020, June 8 2016, and April 22 2013. I stopped scrolling at that point. But today's version seems to be processed more longer. The reds are more brighter, and the blues are also more brighter.
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MarkBour
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by MarkBour » Wed Sep 21, 2022 4:59 pm
Chris Peterson wrote: ↑Wed Sep 21, 2022 2:30 pm
Joe45 wrote: ↑Wed Sep 21, 2022 8:03 am
When did Hubble start operating in the infrared ?
Near-IR extends out to around 2 micrometers, where we're still seeing what we might think of as ordinary light. Uncooled silicon sensors such as those on the HST can be used to that wavelength (and the HST has filters out that far). Longer than that and we're either seeing thermal emissions or highly redshifted light. For that you need cooled sensors made of more exotic materials. That's what we're now seeing from the JWST.
At the near-IR wavelengths Hubble can detect, we're mostly seeing IR used to cut through dust that is opaque at shorter wavelengths.
Interesting! Before you said this, I assumed that the JWST had very cold sensors thanks to its sunshield and space environment. But I now see on Wikipedia that for the MIRI cam, they had to make the sensors even cooler and developed a super-cool (pun intended) cryocooler for it. So, at about 30-40 Kelvin, they have a refrigerator that takes it down to 7 Kelvin. Radical.
Mark Goldfain
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Sa Ji Tario
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by Sa Ji Tario » Wed Sep 21, 2022 7:33 pm
In no similar image did so many galaxies appear as in this one, is it that they are inserted to decorate? but that's how they confuse. This is the second time I see it and it draws no attention
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Sa Ji Tario
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by Sa Ji Tario » Wed Sep 21, 2022 7:46 pm
In the images of the dates mentioned by De58te you can see 5 or 6 galaxies (because it is repeated), but this one is saturated, where in the others there are stars, in this one there are galaxies
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johnnydeep
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by johnnydeep » Wed Sep 21, 2022 9:07 pm
FLPhotoCatcher wrote: ↑Wed Sep 21, 2022 4:23 am
Did someone photoshop out a couple of UFOs on the left?
Nicely spotted. "Artifacts" no doubt.
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"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."{ʲₒʰₙNYᵈₑᵉₚ}
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johnnydeep
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by johnnydeep » Wed Sep 21, 2022 9:12 pm
Sa Ji Tario wrote: ↑Wed Sep 21, 2022 7:46 pm
In the images of the dates mentioned by De58te you can see 5 or 6 galaxies (because it is repeated), but this one is saturated, where in the others there are stars, in this one there are galaxies
The link to the flickr page for the image links in turn to two Hubble .fits files which I found here:
https://archive.stsci.edu/prepds/heritage/horsehead/
I don't know how to view .fits format file (though NASA has a downloadable viewer here -
https://heasarc.gsfc.nasa.gov/docs/soft ... nload.html - haven't tried it yet), and there are interactive versions at the link that also don't show anything in my browser. But the preview shows all the galaxies. The pictures were stacked over multiple days of viewing.
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"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."{ʲₒʰₙNYᵈₑᵉₚ}
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What horsehead?
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by What horsehead? » Wed Sep 21, 2022 9:38 pm
Infrared is pitiless. Gone, the beloved horsehead. Now it's more like...
... the Jar Jar Binks nebula!
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Uncle Jeff
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by Uncle Jeff » Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
If Hubble can tease us with a best-ever IR pic of this nebula, then surely James Webb can follow up shortly with its own best.
BTW, Why did it take so many years for Hubble to cough this up? Could it be a race against the Webb?
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Chris Peterson
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by Chris Peterson » Thu Sep 22, 2022 12:04 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
Not really. The two instruments have about the same resolution, and are designed for very different things. You're comparing apples and oranges.
BTW, Why did it take so many years for Hubble to cough this up? Could it be a race against the Webb?
This target was imaged ten years ago. This image was processed from that old data.
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bystander
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by bystander » Thu Sep 22, 2022 12:25 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
If Hubble can tease us with a best-ever IR pic of this nebula, then surely James Webb can follow up shortly with its own best.
BTW, Why did it take so many years for Hubble to cough this up? Could it be a race against the Webb?
Image Credit: NASA, ESA, and The Hubble Heritage Team (STSci/AURA)
The infrared image of Barnard 33 (Horsehead Nebula) is actually from April of 2013. It was featured on both
HubbleSite and
ESA Hubble on 2013 Apr 19 and on
APOD on 2013 Apr 22. Today's APOD is Alexandra Nachman's processing of that data.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor
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FLPhotoCatcher
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by FLPhotoCatcher » Thu Sep 22, 2022 1:07 am
bystander wrote: ↑Thu Sep 22, 2022 12:25 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
If Hubble can tease us with a best-ever IR pic of this nebula, then surely James Webb can follow up shortly with its own best.
BTW, Why did it take so many years for Hubble to cough this up? Could it be a race against the Webb?
Image Credit: NASA, ESA, and The Hubble Heritage Team (STSci/AURA)
The infrared image of Barnard 33 (Horsehead Nebula) is actually from April of 2013. It was featured on both
HubbleSite and
ESA Hubble on 2013 Apr 19 and on
APOD on 2013 Apr 22. Today's APOD is Alexandra Nachman's processing of that data.
The original image from hubblesite.org is missing a star or some bright-ish object. It's partly visible behind the lower of the two artifacts at far left on today's image. The evidence of the object was apparently just wiped away in the original image.
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FLPhotoCatcher
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by FLPhotoCatcher » Thu Sep 22, 2022 1:26 am
Chris Peterson wrote: ↑Thu Sep 22, 2022 12:04 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
Not really. The two instruments have about the same resolution, and are designed for very different things. You're comparing apples and oranges.
Doesn't the Webb have significantly better resolution at shorter wavelengths, and lower resolution at longer wavelengths?
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Chris Peterson
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by Chris Peterson » Thu Sep 22, 2022 2:12 am
FLPhotoCatcher wrote: ↑Thu Sep 22, 2022 1:26 am
Chris Peterson wrote: ↑Thu Sep 22, 2022 12:04 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
Not really. The two instruments have about the same resolution, and are designed for very different things. You're comparing apples and oranges.
Doesn't the Webb have significantly better resolution at shorter wavelengths, and lower resolution at longer wavelengths?
All telescopes have resolution that scales with both aperture and wavelength.
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johnnydeep
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by johnnydeep » Thu Sep 22, 2022 12:51 pm
FLPhotoCatcher wrote: ↑Thu Sep 22, 2022 1:07 am
bystander wrote: ↑Thu Sep 22, 2022 12:25 am
Uncle Jeff wrote: ↑Wed Sep 21, 2022 10:42 pm
Anything Hubble can do, Webb can do better...
If Hubble can tease us with a best-ever IR pic of this nebula, then surely James Webb can follow up shortly with its own best.
BTW, Why did it take so many years for Hubble to cough this up? Could it be a race against the Webb?
Image Credit: NASA, ESA, and The Hubble Heritage Team (STSci/AURA)
The infrared image of Barnard 33 (Horsehead Nebula) is actually from April of 2013. It was featured on both
HubbleSite and
ESA Hubble on 2013 Apr 19 and on
APOD on 2013 Apr 22. Today's APOD is Alexandra Nachman's processing of that data.
The original image from hubblesite.org is missing a star or some bright-ish object. It's partly visible behind the lower of the two artifacts at far left on today's image. The evidence of the object was apparently just wiped away in the original image.
This one?
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."{ʲₒʰₙNYᵈₑᵉₚ}