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The Astronomy thread

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Re: The Astronomy thread

Postby SANEAlex » Mon Dec 11, 2017 08:13 pm

Nonny Mouse wrote:Just saw a supercool shooting star, may count as a fireball :D


Could have been an early Geminid did it have a yellowish ting? Over the years i have had more luck spotting Perseids and Leonids but if they are good this year maybe i should risk freezing a bit 8) :wink:

https://en.wikipedia.org/wiki/Geminids
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Re: The Astronomy thread

Postby Nonny Mouse » Thu Dec 14, 2017 12:32 am

Yes it did! I heard about the Geminids in the news today and I think that makes perfect sense.

Edit: What causes the yellow?
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Re: The Astronomy thread

Postby steeljam » Thu Dec 14, 2017 01:22 am

Nonny Mouse wrote:Yes it did! I heard about the Geminids in the news today and I think that makes perfect sense.
Edit: What causes the yellow?
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Re: The Astronomy thread

Postby Whos Wee Dug » Thu Dec 14, 2017 06:48 pm

steeljam wrote:
Nonny Mouse wrote:Yes it did! I heard about the Geminids in the news today and I think that makes perfect sense.
Edit: What causes the yellow?
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Re: The Astronomy thread

Postby SANEAlex » Thu Dec 14, 2017 09:35 pm

Nonny Mouse wrote:Yes it did! I heard about the Geminids in the news today and I think that makes perfect sense.

Edit: What causes the yellow?


The Geminids are thought to come from an asteroid source rather than the usual comet source for most of our meteor showers I can only assume the Geminid source material has a high carbon content as that is what gives candles their yellow look IIRC but there could be other materials that also give yellow light.
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Re: The Astronomy thread

Postby Sandra » Fri Dec 15, 2017 10:54 am

I asked Adrian:

Without the exact wavelength (as though you'd have a spectrometer to hand :roll: ) he's saying almost any transition metal could produce a 'yellow' light in the meteor alternatively Argon also produces yellow and that's in the atmosphere at about 1%

Without wavelengths or composition it's a lot of 'could'

And that's assuming that it's all excess energy being dumped as fluorescence - if phosphorescence occurred it's complex molecules being ripped apart rather than atoms getting excited.

(NB Adrian used to test for metals qualitatively and quantitatively by throwing samples into plasma - do not ask about water bands unless you have plenty of time - astronomy shows get an extra voice over when they get the spectrometry wrong!)
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Re: The Astronomy thread

Postby SANEAlex » Fri Dec 15, 2017 04:43 pm

Sandra wrote:I asked Adrian:

Without the exact wavelength (as though you'd have a spectrometer to hand :roll: ) he's saying almost any transition metal could produce a 'yellow' light in the meteor alternatively Argon also produces yellow and that's in the atmosphere at about 1%

Without wavelengths or composition it's a lot of 'could'

And that's assuming that it's all excess energy being dumped as fluorescence - if phosphorescence occurred it's complex molecules being ripped apart rather than atoms getting excited.

(NB Adrian used to test for metals qualitatively and quantitatively by throwing samples into plasma - do not ask about water bands unless you have plenty of time - astronomy shows get an extra voice over when they get the spectrometry wrong!)


I bow to my esteemed Smoking GNU colleagues expertise as interpreted by Sandra he has got interesting letters after his name me I'm just an enthusiastic amateur :wink: . I did manage to see a couple of Geminids last night through glass one long and thin the other short ending in bright flash the 1st was more yellowish the 2nd seemed a bit more multicoloured.
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Re: The Astronomy thread

Postby Sandra » Fri Dec 15, 2017 06:07 pm

I don't get time outside to see them myself, hope those of you who do get a great view
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Re: The Astronomy thread

Postby Nonny Mouse » Sun Dec 17, 2017 01:35 am

Okay, I saw something on Facebook that said the color is determined by what it's made of - which I guessed but I meant specificially - and yellow is apprently caused by: iron.
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Re: The Astronomy thread

Postby Darren » Mon Dec 18, 2017 02:07 pm

Nonny Mouse wrote:Okay, I saw something on Facebook that said the color is determined by what it's made of - which I guessed but I meant specificially - and yellow is apprently caused by: iron.


Indeed - see here.

Or talk to your local firework manufacturer...
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Re: The Astronomy thread

Postby chrisboote » Tue Dec 19, 2017 08:03 am

Another reason I could never do chemistry - most of those look grey to me :(
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Re: The Astronomy thread

Postby Grace Speaker » Tue Dec 19, 2017 09:52 am

chrisboote wrote:Another reason I could never do chemistry - most of those look grey to me :(
What about a festive Chemistry Advent calendar? :wink:
http://www.compoundchem.com/2017/12/12/chemadvent2017-halfway/
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Re: The Astronomy thread

Postby Nonny Mouse » Wed Dec 20, 2017 03:38 am

Darren wrote:
Nonny Mouse wrote:Okay, I saw something on Facebook that said the color is determined by what it's made of - which I guessed but I meant specificially - and yellow is apprently caused by: iron.


Indeed - see here.

Or talk to your local firework manufacturer...


COOL! thanks!
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Re: The Astronomy thread

Postby chrisboote » Thu Jan 04, 2018 09:00 am

NASA are going to Mars - and beyond!

https://www.nasa.gov/content/journey-to-mars-overview
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Re: The Astronomy thread

Postby steeljam » Thu Jan 04, 2018 12:19 pm

chrisboote wrote:NASA are going to Mars - and beyond!
https://www.nasa.gov/content/journey-to-mars-overview

No mention of a golf course, as of yet.
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