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

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3747
Joined: Fri Dec 04, 2009 3:27 am

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.

<< Previous APOD This Day in APOD Next APOD >>

User avatar
neufer
Vacationer at Tralfamadore
Posts: 16539
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

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

User avatar
orin stepanek
Plutopian
Posts: 5154
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

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
Interesting picture; even though it is a composite!
You do not have the required permissions to view the files attached to this post.
Orin

Smile today; tomorrow's another day!

User avatar
Ann
4725 Å
Posts: 9963
Joined: Sat May 29, 2010 5:33 am

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

Ann
Color Commentator

User avatar
Chris Peterson
Abominable Snowman
Posts: 14671
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

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.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

TheOtherBruce
Ensign
Posts: 70
Joined: Wed Jul 17, 2019 6:07 pm

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...)
This universe shipped by weight, not by volume.
Some expansion of the contents may have occurred during shipment.

User avatar
orin stepanek
Plutopian
Posts: 5154
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

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

Smile today; tomorrow's another day!