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Linkage : APOD: 2022 July 18 - Stephans Quintet from Webb, Hubble, and Subaru[^].
That's the APOD from Monday, the 18th. What I found most interesting about it is the text where it describes how the Hubble and Webb telescopes are sensitive to different bandwidths of light. The effect is really cool when images from them are combined.
PS - today's image is pretty cool too. Be sure to check it out.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Looks like the Hubble imaged Stephan's Quintet around "July/August, 2009". And Subaru took it's image around the same time on "2009-05-25". So there is around 12 years between those and the Webb image.
I wonder how that affects the composite image.
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Given the distances involved - I doubt that you could notice any difference.
Given a star moving transverse to the line of sight at the speed of light, its angular movement would be 12/290,000,000 radians, or 0.009 seconds of arc. As stars typically move at a dmall fraction of the speed of light, the difference would be immeasurable.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Yeah, but I'm wondering about brightness difference[^], not motion across the sky. There's alot of dust in there, I wonder how it affects the composite image.
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Given that the "window" for each telescope partly overlaps that of another, I would assume that they adjusted the brightnesses of the overlapping parts so that they matched.
While individual stars' brightness can vary, I doubt that entire galaxies (or significant parts thereof) would vary much in such a short time. You would have to either explain a massive violation of Special Relativity, or propose a mechanism whereby large numbers of stars would independently change their brightness over such a short time.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Stephan's Quintet contains five galaxies. I'm referring to galaxy brightness[^] fluctuations over the last 12 years. I couldn't find any information about how that would be calculated so I gave up. I did find a reference stating that another telescope could only measure galaxy brightness over "one light week" resolution but it was old and seemed to be about another older telescope.
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Wordle 395 4/6
🟩⬜⬜⬜⬜
🟩🟨🟩⬜🟨
🟩🟩🟩⬜🟨
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Wordle 395 4/6
🟩⬜⬜⬜⬜
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Straightforward today.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Wordle 395 2/6
⬛🟨🟨🟨⬛
🟩🟩🟩🟩🟩
A rare 2!
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Wordle 395 3/6
⬜⬜🟨⬜🟨
🟩🟨⬜⬜🟨
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"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Wordle 395 4/6
⬜⬜⬜⬜🟨
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🟩🟩🟩🟩🟩
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
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Wordle 395 4/6*
⬜⬜🟨⬜⬜
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Happiness will never come to those who fail to appreciate what they already have. -Anon
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Wordle 395 3/6
🟨⬜⬜🟨⬜
🟨🟩🟨🟩⬜
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Wordle 395 4/6
⬛🟨🟨⬛🟩
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🟩🟩🟩🟩🟩
GCS/GE d--(d) s-/+ a C+++ U+++ P-- L+@ E-- W+++ N+ o+ K- w+++ O? M-- V? PS+ PE Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Wordle 395 4/6*
⬜⬜⬜🟨⬜
🟨🟨🟨⬜🟨
🟨🟨🟨🟨🟩
🟩🟩🟩🟩🟩
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Wordle 395 4/6
⬛⬛🟨🟩⬛
⬛⬛⬛🟩🟨
⬛🟨⬛🟩🟩
🟩🟩🟩🟩🟩
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Wordle 395 4/6
⬛🟨🟨⬛⬛
⬛⬛🟨⬛🟩
⬛⬛🟨🟨🟩
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Get me coffee and no one gets hurt!
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is it so hot ? no ac?
Caveat Emptor.
"Progress doesn't come from early risers – progress is made by lazy men looking for easier ways to do things." Lazarus Long
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Quite warm today thank you.
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Warm. Pleasant. Not actually raining. Or snowing, sleeting, hailing, blattering, or even graupeling.
Somewhat of a surprise for a Welsh summer.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: Warm. Pleasant.
Here in Yorkshire, it's currently 35°C / 95°F, and set to go to 40°C / 104°F tomorrow. Not what I would call "pleasant" at all.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I have two secret weapons here:
1) This is Wales - we don't complain about warm weather because it's normally p*ssing down.
2) I have a fresh batch of Lemon Sorbet in the freezer to help with cooling and hydration. It's also excellent with tonic water as a cold "drink", and IIRC very palatable if used as the replacement for ice-and-a-slice in a G&T ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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