APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

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APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by APOD Robot » Tue Nov 19, 2019 5:10 am

Image Milky Way over Uruguayan Lighthouse

Explanation: Can a lighthouse illuminate a galaxy? No, but in the featured image, gaps in light emanating from the Jose Ignacio Lighthouse in Uruguay appear to match up nicely, although only momentarily and coincidently, with dark dust lanes of our Milky Way Galaxy. The bright dot on the right is the planet Jupiter. The central band of the Milky Way Galaxy is actually the central spiral disk seen from within the disk. The Milky Way band is not easily visible through city lights but can be quite spectacular to see in dark skies. The featured picture is actually the addition of ten consecutive images taken by the same camera from the same location. The images were well planned to exclude direct light from the famous lighthouse.

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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by neufer » Tue Nov 19, 2019 11:03 am

Click to play embedded YouTube video.
Art Neuendorffer

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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by orin stepanek » Tue Nov 19, 2019 12:01 pm

LighthouseMilkyWay_Salazar_960.jpg
LighthouseMilkyWay_Salazar_960.jpg (45.97 KiB) Viewed 2137 times
Interesting picture; even though it is a composite!
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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by Ann » Tue Nov 19, 2019 12:17 pm

orin stepanek wrote: Tue Nov 19, 2019 12:01 pm LighthouseMilkyWay_Salazar_960.jpg
Interesting picture; even though it is a composite!
Thanks for that comment, Orin! :D I wasn't sure what to say myself. You summed it up perfectly! :D

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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by Chris Peterson » Tue Nov 19, 2019 2:07 pm

orin stepanek wrote: Tue Nov 19, 2019 12:01 pm LighthouseMilkyWay_Salazar_960.jpg
Interesting picture; even though it is a composite!
I would not call this picture a "composite". Summing a series of consecutive images is merely a stack- a technique for making a longer exposure than a camera otherwise supports. If the exposure times are changed to increase dynamic range (I don't know if that's the case here) it's a form of HDR processing. Still not composite.

A composite image would have different elements in different frames, and all the frames wouldn't necessarily be captured at the same location or in the same direction.
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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by TheOtherBruce » Wed Nov 20, 2019 1:50 am

neufer wrote: Tue Nov 19, 2019 11:03 am
Click to play embedded YouTube video.
πr not square.

πr round.

(You don't want to know how long I've been waiting for a halfway decent opportunity to use that line...)
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Some expansion of the contents may have occurred during shipment.

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Re: APOD: Milky Way over Uruguayan Lighthouse (2019 Nov 19)

Post by orin stepanek » Wed Nov 20, 2019 2:59 am

Oh; I'm so sorry! I thought that this meant that it was a composite!
The featured picture is actually the addition of ten consecutive images taken by the same camera from the same location.
Maybe I read into it wrong! :oops:
Orin

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