APOD: A Waterfall and the Milky Way (2021 Nov 01)

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APOD: A Waterfall and the Milky Way (2021 Nov 01)

Post by APOD Robot » Mon Nov 01, 2021 4:06 am

Image A Waterfall and the Milky Way

Explanation: The dream was to capture both the waterfall and the Milky Way together. Difficulties included finding a good camera location, artificially illuminating the waterfall and the surrounding valley effectively, capturing the entire scene with numerous foreground and background shots, worrying that fireflies would be too distracting, keeping the camera dry, and avoiding stepping on a poisonous snake. Behold the result -- captured after midnight in mid-July and digitally stitched into a wide-angle panorama. The waterfall is the picturesque Zhulian waterfall in the Luoxiao Mountains in eastern Hunan Province, China. The central band of our Milky Way Galaxy crosses the sky and shows numerous dark dust filaments and colorful nebulas. Bright stars dot the sky -- all residing in the nearby Milky Way -- including the Summer Triangle with bright Vega visible above the Milky Way's arch. After capturing all 78 component exposures for you to enjoy, the photographer and friends enjoyed the view themselves for the rest of the night.

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orin stepanek
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Re: APOD: A Waterfall and the Milky Way (2021 Nov 01)

Post by orin stepanek » Mon Nov 01, 2021 12:15 pm

I like the photo; and the explanation! 8-)
Best of friends, the three amigos! :lol2:
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Re: APOD: A Waterfall and the Milky Way (2021 Nov 01)

Post by Ann » Mon Nov 01, 2021 5:53 pm

Very good-looking APOD! But for a long time I couldn't make head or tail of some parts of the skyscape, so I had to annotate it for my own sake.Hope you like it!
APOD November 1 2021 annotated.png

1) Alpha Ophiuchi, Rasalhague

2) Beta Ophiuchi

3) A lot of stars and some clusters in Ophiuchus, like IC 4665 next to Beta Oph, and NGC 6633 at left, and IC IC 4756 at far left (in Serpens)

4) There seems to be no number 4! I forgot number 4! 😲

5) The Scutum Star Cloud.

6) The Small Sagittarius Star Cloud.

7) Altair, one of the stars of the Summer Triangle.

8) Bright bluish Vega, brightest-looking star of the Summer Triangle.

9) Neat little constellation Lyra! I may not have drawn it perfectly correct.

10) Star Sadr, Gamma Cygni, and surrounding nebulosity.

11) Mighty A-type supergiant star Deneb of the third apex of the Summer Triangle.

12) The North America Nebula.

13) The IC 1396 Nebula with red supergiant star Mu Cephei.

Compare the upper right part of the skyscape in today's APOD with the left and lower left part of the picture of constellation Ophiuchus by Tony And Daphne Hallas.

Constellation Ophiuchus Tony and Daphne Hallas.png
Constellation Ophiuchus. Photo: Tony and Daphne Hallas.

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Re: APOD: A Waterfall and the Milky Way (2021 Nov 01)

Post by neufer » Mon Nov 01, 2021 8:16 pm

https://en.wikipedia.org/wiki/Bifurcation_diagram wrote:
  • A bifurcation diagram example is that of the
    logistic map: x n+1 = r xn ( 1 − xn)

The bifurcation parameter r is shown on the horizontal axis of the plot and the vertical axis shows the set of values of the logistic function visited asymptotically from almost all initial conditions.

The bifurcation diagram shows the forking of the periods of stable orbits from 1 to 2 to 4 to 8 etc. Each of these bifurcation points is a period-doubling bifurcation. The ratio of the lengths of successive intervals between values of r for which bifurcation occurs converges to the first Feigenbaum constant:
  • δ = 4.669201609102990671853203820466…
Art Neuendorffer