Meteor Photographed by Accident: Spectacular Green Bolide

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Discussion Overview

The discussion revolves around the causes of the green color observed in a bolide that was photographed. Participants explore various chemical compounds and phenomena that could contribute to this coloration, considering both atmospheric and meteoric sources. The scope includes theoretical explanations and speculative reasoning related to chemistry and atmospheric physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that the green color could be due to copper, nickel, or barium present in the meteor.
  • Others suggest that atomic oxygen, particularly its emission line at 557.7 nm, might be responsible for the green hue.
  • A participant mentions the possibility of an optical quirk affecting the perceived color.
  • One contributor recalls a childhood chemistry experiment where nickel produced a bright green color in a flame, suggesting a similar effect could occur with the meteor.
  • Another participant notes that while copper is unlikely to be present in significant amounts in meteorites, nickel is commonly found in several meteorite groups.
  • There is a mention of magnesium (Mg) as a potential contributor to the green color, referencing a specific meteor spectrum captured in the past.
  • Concerns are raised about the influence of camera settings and display conditions on the perceived color of the photograph.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the source of the green color, with no consensus reached on which explanation is correct. The discussion remains unresolved as various hypotheses are presented and debated.

Contextual Notes

Participants acknowledge the complexity of the topic, including the dependence on specific conditions such as camera settings and atmospheric effects, which may influence the observed color. There is also uncertainty regarding the presence of certain elements in meteorites.

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Air.
 
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Vanadium 50 said:
Air.

What compound in the air exhibits transitions that would produce the green colour? Don't know anything about mineralogy but I presumed this one might be caused by something like copper, nickel or barium in the meteor, or something else that's usually green

That is, unless the colour is only due to an optical quirk, or some other effect that I don't know about
 
I think it's atomic oxygen, which has a line at 557.7 nm.
 
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1610119124706.png
 
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etotheipi said:
What compound in the air exhibits transitions that would produce the green colour? Don't know anything about mineralogy but I presumed this one might be caused by something like copper, nickel or barium in the meteor, or something else that's usually green

That is, unless the colour is only due to an optical quirk, or some other effect that I don't know about
Could be nickel as well.
 
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This and the meteor are almost surely from oxygen
I have seen red auroras this prominent in Maine 40 yrs ago. Amazingly the magnetic pole has wandered far enough north and west during my lifetime to make them far less common in Maine (also I am now in the Midwest mostly!). One of the best of nature's displays.
 
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chemisttree said:
Could be nickel as well.
One of the earliest chemistry experiments I learned as a child from my father (chemist/EE) was to hold metal coins (before laminates became common) in a natural gas flame using long pliers. Each coin displayed a characteristic color in the flame. Nickles showed bright green.

Perhaps both meteor material and atmospheric oxygen contribute to the colors in this excellent photo.
 
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Klystron said:
One of the earliest chemistry experiments I learned as a child from my father (chemist/EE) was to hold metal coins (before laminates became common) in a natural gas flame using long pliers. Each coin displayed a characteristic color in the flame. Nickles showed bright green.

Perhaps both meteor material and atmospheric oxygen contribute to the colors in this excellent photo.
Yes, both oxygen (even though that’s strictly “forbidden”!) or nickel could have caused it.
 
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swampwiz said:
What would make a bolide be green? Copper?

etotheipi said:
this one might be caused by something like copper, nickel or barium in the meteor,

Highly unlikely copper, as there is close to zero copper in meteorites that have been classified

Nickel tho, is present in good quantities in the 3 main meteorite groups

Vanadium 50 said:
I think it's atomic oxygen, which has a line at 557.7 nm.

Agreed, along with the nickel in the meteor as klystron said, would be my thoughts as well ...

Klystron said:
Perhaps both meteor material and atmospheric oxygen contribute to the colors in this excellent photo.

Green glowing meteors are not that uncommon

One reference

Another site that shows the image linked to in the OP, states that it is the nickel in the meteor

Green Meteors Look Amazing From Anywhere, Be It South India Or Australia (indiatimes.com) seems to be difficult to find specific info from trustworthy sources :frown:
 
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  • #12
You also need to know the camera settings. My Nikon, a P900, has quite a lot of substantial color variations I could produce just from a single color setting. The photographer could easily have chosen something for the purposes of his project that did not faithfully capture the original frequency-dependent flux of the moment. In fact, how you perceive that photo is even dependent on our monitor and surroundings.
 

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