HST Ghost (2009 May 25)

Ollie · Post by **Ollie** » Mon May 25, 2009 1:40 pm

Are the ghost images of the HST in todays Apod 25-05-09 caused by reflections off of Atlantis window?

orin stepanek · Post by **orin stepanek** » Mon May 25, 2009 2:09 pm

http://apod.nasa.gov/apod/ap090525.html

I never noticed the ghost until you mentioned it. I'm not sure where the reflection comes from.

Orin

aristarchusinexile · Post by **aristarchusinexile** » Mon May 25, 2009 2:50 pm

Ollie wrote:Are the ghost images of the HST in todays Apod 25-05-09 caused by reflections off of Atlantis window?

Very observant, Ollie.

persia48 · Post by **persia48** » Mon May 25, 2009 7:28 pm

In the APOD photo dated May 25, the photo is of the HST; my questions is what is the disturbance seen just below the lower panels at the earth's horizon?

Ollie · Post by **Ollie** » Mon May 25, 2009 8:08 pm

Hi Persia

I think the disturbance is a ghost image of the HST caused by taking the photo through a window of the Atlantis orbiter. Some times when a photo is taken through a window you get this effect. I guess it is some thing to do with refraction? Mabey someone, a phographer perhaps could confirm this for us

neufer · Post by **neufer** » Mon May 25, 2009 10:19 pm

Ollie wrote:Hi Persia

I think the disturbance is a ghost image of the HST caused by taking the photo through a window of the Atlantis orbiter. Some times when a photo is taken through a window you get this effect. I guess it is some thing to do with refraction? Maybe someone, a photographer perhaps could confirm this for us

There will be a double internal reflection that will be displaced from the original
by an amount dependent on the angle and thickness of the glass (periscope like):

http://www.cmog.org/dynamic.aspx?id=5654 wrote:
<<The space shuttle has triple paned, optical-quality windows. Thirty-seven window panes in eleven different sizes and shapes are produced for each Orbiter. The fused silica outer panes of the forward windshields are designed to withstand high atmosphere reentry temperatures. The inner, tempered alumino-silicate glass pane is called the pressure pane. It is designed for maximum strength to withstand the shuttle's cabin pressure in the vacuum of space. The thick fused silica middle pane is capable of withstanding both the reentry temperature and the cabin pressure.>>

BMAONE23 · Post by **BMAONE23** » Tue May 26, 2009 1:42 am

I believe it would be a negative image of the Mirror image that is reflected on the outside of the window glass

jlhonora · Post by **jlhonora** » Sun Aug 30, 2009 4:19 pm

If you open the image in full mode you can even get to see the hand that takes the picture.

Definetely window reflection.

Starship Asterisk*

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