Astronomy and Space

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jaap
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Re: Astronomy and Space

Post by jaap » Tue Jul 12, 2022 9:40 am

plodder wrote:
Tue Jul 12, 2022 8:53 am
The slidey thing here: https://www.theguardian.com/science/202 ... axy-images

It's not lined up right, right? These are two different bits of space?
The same bit of space but they are not lined up. The JW one is rotated about 1/6 of a turn anticlockwise and zoomed in a bit.

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Gfamily
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Re: Astronomy and Space

Post by Gfamily » Tue Jul 12, 2022 9:59 am

jaap wrote:
Tue Jul 12, 2022 9:40 am
plodder wrote:
Tue Jul 12, 2022 8:53 am
The slidey thing here: https://www.theguardian.com/science/202 ... axy-images

It's not lined up right, right? These are two different bits of space?
The same bit of space but they are not lined up. The JW one is rotated about 1/6 of a turn anticlockwise and zoomed in a bit.
The HST image itself is a composite from at least two imaging sessions as well - you can tell because there are 8 spikes on the brightest star's image - 4 very clear, and 4 offset by about 20 degrees.
HST offset.png
HST offset.png (87.92 KiB) Viewed 260 times
I suggest that one of the sessions was in optical range, and one in the near IR where Hubble has some capability.
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ETA 5/8/20: I've been advised that the result was correct, it was the initial interpretation that needed to be withdrawn
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dyqik
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Re: Astronomy and Space

Post by dyqik » Tue Jul 12, 2022 11:09 am

Gfamily wrote:
Tue Jul 12, 2022 9:06 am
For an idea of the scale, imagine the photo on your phone's screen.
Now imagine you're a goalkeeper and the other goalkeeper is showing you this image from their goalline (I don't know why they have your phone, but bear with me). That's the area of the image* on the sky.


*Appx 7cm at 100 metres.
Or the goalie holding a tennis ball, if you want a purely sports* analogy.

Which is really big compared to one bit of what I do, which is more like a tennis ball on the moon. Or 7cm at 380,000,000 meters. This is the size of the ring in the EHT images.

And really small compared to the other bit if what I do, which is like 7cm at 10cm for the field of view (45° on the sky, sine rather than tangent because we're working on a sphere). This is roughly the size of the full map that makes up Gfamily's avatar.

Although the main thing I do has about the same image sizes as JWST.

*A sport with goals 100m apart that uses tennis balls. Or we could go to cricket, I guess.

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Stranger Mouse
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Re: Astronomy and Space

Post by Stranger Mouse » Tue Jul 12, 2022 3:48 pm

Someone here has done a nice Webb / Hubble overlay https://twitter.com/luckytran/status/15 ... e2L1NRD_bQ
I’ve decided I should be on the pardon list if that’s still in the works

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shpalman
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Re: Astronomy and Space

Post by shpalman » Fri Aug 05, 2022 12:06 pm

molto tricky

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Sciolus
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Re: Astronomy and Space

Post by Sciolus » Fri Aug 05, 2022 6:14 pm

Anyone got one of these self-assembly brass orreries? They look rather nice, but at 60 cm across I'm not sure where I'd put it.

(If anyone's tempted, there's a widely advertised code for £100 off.)

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Aitch
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Re: Astronomy and Space

Post by Aitch » Sat Aug 13, 2022 2:33 pm

Missed the Perseids last night (OK, I forgot) and only remembered the Big Moon this morning. Still looked pretty big, though it's hard to tell from a photograph. :(
10803-cess.jpg
10803-cess.jpg (94.93 KiB) Viewed 13 times
I take it this counts as 'Astronomy and Space'?
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