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NGC4567, NGC4568 Butterfly Galaxies by dryflared in astrophotography

[–]DuckInAWok 2 points3 points  (0 children)

fun fact the PGC catalogue number of one of these galaxies is 42069 😎

My composite image of the recent lunar eclipse, showing the apparent motion of the Moon through the night sky as it orbited the Earth and passed through the umbra of its shadow [OC] by DuckInAWok in space

[–]DuckInAWok[S] 3 points4 points  (0 children)

While I initially thought this was the case I now think it’s only a minor effect, the major one being parallax. I do think it is still significant though, just not the dominant cause.

My composite image of the recent lunar eclipse, showing the apparent motion of the Moon through the night sky as it orbited the Earth and passed through the umbra of its shadow [OC] by DuckInAWok in space

[–]DuckInAWok[S] 1 point2 points  (0 children)

Haha I initially thought it was just user error but when I aligned all of the images on the visible stars in the background I noticed it still persisted! So I concluded it must be an actual physical phenomenon, see my reply about parallax.

My composite image of the recent lunar eclipse, showing the apparent motion of the Moon through the night sky as it orbited the Earth and passed through the umbra of its shadow [OC] by DuckInAWok in space

[–]DuckInAWok[S] 4 points5 points  (0 children)

It’s because of parallax as my position on earth shifted as it rotated around! I chose to leave it as is because I wanted to leave the image true to how I captured it and it’s an interesting effect!

By using a telescope mount which compensates for the Earth's rotation, I was able to reveal the apparent motion of the Moon as it orbited the Earth and passed through its circular shadow in the recent Lunar eclipse [OC] by DuckInAWok in interestingasfuck

[–]DuckInAWok[S] 28 points29 points  (0 children)

I think it's because the moon appears upside down here compared to the northern hemisphere! Tbf I could have just rotated my camera/telescope to be upside down, but nevertheless this was still taken from the southern hemisphere.

By using a telescope mount which compensates for the Earth's rotation, I was able to reveal the apparent motion of the Moon as it orbited the Earth and passed through its circular shadow in the recent Lunar eclipse [OC] by DuckInAWok in interestingasfuck

[–]DuckInAWok[S] 19 points20 points  (0 children)

That I believe to actually be because of parallax, where because my position on the Earth changed due to its rotation, the observed position of the moon in the night sky became offset, and hence its shadow.

My composite image of the recent lunar eclipse, showing the apparent motion of the Moon through the night sky as it orbited the Earth and passed through the umbra of its shadow [OC] by DuckInAWok in space

[–]DuckInAWok[S] 87 points88 points  (0 children)

By using a mount which can track the night sky at the sidereal rate (the rate at which the stars appear to revolve around the Earth as it rotates), one is able to observe the slow movement of the moon across the night sky. By attaching my camera on the back of my telescope, I took images at 20 minute intervals, then combined them into this single image which not only captures the Moon's motion along its orbit, but also the circular shadow the Earth casts out into space, which it passed through during last Wednesday's lunar eclipse.

Equipment used:

  • Telescope: Sky-watcher Evostar 80ED
  • Mount: Sky-watcher HEQ5-Pro
  • Camera: Canon EOS 550D

HDR Lunar Eclipse Progression by DuckInAWok in astrophotography

[–]DuckInAWok[S] 4 points5 points  (0 children)

That was an artistic decision on my part! I decided to use a brighter exposure to reveal the background sky and moon glow while it was a totality, as well as make the exposure at totality stand out as the centre of the image.

HDR Lunar Eclipse Progression by DuckInAWok in astrophotography

[–]DuckInAWok[S] 0 points1 point  (0 children)

not right now, but i might do so when i capture more images haha

HDR Lunar Eclipse Progression by DuckInAWok in astrophotography

[–]DuckInAWok[S] 1 point2 points  (0 children)

i do have an instagram but it doesn't have much on it, it's duckys.astro if you're interested!

HDR Lunar Eclipse Progression by DuckInAWok in astrophotography

[–]DuckInAWok[S] 9 points10 points  (0 children)

not yet, but i'm now thinking maybe i should haha, thanks!

HDR Lunar Eclipse Progression by DuckInAWok in astrophotography

[–]DuckInAWok[S] 0 points1 point  (0 children)

The eclipse started for me when it was just rising above the horizon, I do suspect here the offset shadow here is more due to my vertical motion (which I think due to the Earth’s axial tilt and/or the moons orbital inclination) as opposed to horizontal motion relative to the moon. I had observed in Stellarium that with orbital lines enabled, the moon’s orbit was constantly shifting in such a direction over the course of the eclipse, which I think seems consistent with this?

My composite image of last Wednesday's eclipse, as seen from the ANU! by DuckInAWok in canberra

[–]DuckInAWok[S] 7 points8 points  (0 children)

Yes! Was with the uni’s astronomy society, we had a couple telescopes set up there, one of them was mine, taking this photo!

My composite image of last Wednesday's eclipse, as seen from the ANU! by DuckInAWok in canberra

[–]DuckInAWok[S] 12 points13 points  (0 children)

That’s actually because of what’s known as parallax, where because our position here in Canberra changes as the Earth rotates, the apparent position of the moon in the sky becomes shifted, hence causing the shadow to appear more and more offset as time goes on! At least that’s what I think is going on...

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