Test 16.5.2025

nur ein Test

Baily Beads Analysis for the solar eclipse 2024 Apr 08 in Stephenville TX

Comparison of Baily Beads Analysis in Occult 4 by David Herald and the predictions by the Besselian Elements team/John Irwin in JOA2024_4.pdf

following up SEML msg #33125 Oct. 09 2024
https://groups.io/g/SEML/message/33125
An article we wrote on experimentally assessing eclipse maps accuracy has recently been published in the Journal for Occultation Astronomy:
https://iota-es.de/JOA/JOA2024_4.pdf
Few months ago we started a discussion on SEML about the subject: the article presents further experimental data and it provides a more thorough analysis of the matter. We hope it will contribute to the appreciation of the subtle art of eclipse predictions and mapping.
Kind Regards, Luca Quaglia on behalf of the Besselian Elements Team 

Figure5 on pg 6 JOA2024_4.pdf

Occult limbplot for C2

Occult limbplot for C3

Screenshot Occult for C2

Screenshot Occult for C3

An insightful discussion of the TSE2024 in the northern graze zone - that paper is also most valuable in the comparison of various eclipse prediction/simulation tools.
How does Occult 4 fit in here?
I cross-checked the predictions by John Irvin of the Besselian Elements team using the paramaters given for the Stephenville, TX site and the published "eclipse solar radius" r=959.95".
I get 14 sec for the duration of totality within the accuracy of reading the graph to the nearest half-second which is essentially identical to 13.7 s in JOA2024_4.pdf.
The contact times  C2 and C3 are approx. 1 sec earlier in Occult: C2=18:39:05.5, C3=18:39:19.5. than reported (18:39:06.6 and 18:39:20.3).

First of all this is quite comforting for users of Occult.
What might be the reason for the offset of 1 sec in time?
Occult uses the ephemeris DE435 while Besselian Elements/John Irwin use DE440, there might  be other causes. 

BTW it is essential to use the latest EOP (Earth orientation) parameters in Occult.

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Harvest Full Moon rising

The full Moon rising on Sept 13, 2019 behind Fernsehturm Stuttgart

Stack of exposures between 20:25 and 20:44 CEST cropped

uncropped

Time-Lapse animated gif

Composite full Moon 2019 Apr 19 and Sep 13

Composite full Moon 2019 Apr 19 and Sep 13 from the same location
Lunar distances
Apr 19 368474 km near perihelion
Sep 13 405759 km near aphelion

Total Lunar Eclipse 2018 July 27

The Total Lunar Eclipse of July 27, 2018 seen from Stuttgart with Fernsehturm in background

Stack of 2 exposures at 21:49 and 22:05 CEST

Stack of 6 exposures 22:18 CEST with plane track

Stack of 6 exposures 22:18 CEST with plane track

Stack of 7 exposures 22:11 - 22:34 CEST

21:20 CEST, 10 min before totality, 400mm lens
The still partially eclipsed moon 10 minutes before totality was discovered later on the photographs and video.
I did not notice it visually through binos, the group next to me did not see it either.

Animation 3 exp 21:18 - 21:20 CEST, 400mm lens

Easter Full Moon rising

Easter Full Moon rising behind Fernsehturm Stuttgart 2018 Mar 31

19:20 CEST

Composite of exposures between 20:12 - 20:37 CEST

Stack 20:12 - 20:37 CEST

Timelapse 2018 Mar 31, 20:12 - 20:37 CEST

Partially eclipsed Moonrise

Partially eclipsed Moon rising on Aug. 07 2017 from Karlshöhe in Stuttgart with Fernsehturm in background

Composite of 5 images 21:09 - 22:02 CEST crop2000

Composite image, stack of individual exposures at 21:09 CEST (foreground) and 21:23, 21:32, 21:43, 22:02. The penumbral shadow is visible on the first three lunar images. The end of the umbral phase was 21:18 CEST. Lumix G3 at f=45 mm.

crop 2000*3000

uncropped

Animation f=400mm

Animation Moonrise

Closeup 3D views of Philae at it's landing site Abydos on comet 67P C-G

The Rosetta Osiris NAC images of May 25 2016, 19:58 and 20:02 as published on Sep 28, 2016 in The story behind finding Philae were first contrast adjusted to enhance detail in the shadow

Original image credits:
ESA/Rosetta/NAVCAM/OSIRIS – CC BY-SA IGO 3.0 Copyright
ESA/Rosetta//OSIRIS

• Original image provided as .IMG file in the archive delivery from : ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
• Original image processed by ESA/Rosetta/SGS/PSA&ESDC to create image for Archive Image Browser

then combined in stereo anaglyphs (rotated 90 deg)

One of Philae's legs is seen leaning on to "Perihelion cliff"

The ESA blog shows only the immediate surroundings of Philae, the whole Osiris image of May 25, 20:02 was presented at the Planetarium Stuttgart by K. Seidensticker on Dec 16, 2016
The resolution is 9.8 cm/pixel.

Here are the anaglyphs embedded in this context

In the formal discovery announcement of Sep. 05, 2016 a better resolved image from Sep. 02 is shown, however no stereo pair was captured.

Sep 02 w/ Philae left and a NAVCAM view on Aug. 06, 2016

On a Navcam image also from May 25, 2016 ROS_CAM1_20160525T200005F._P there is a bright spot at the location of Philae (arrow)

ROS_CAM1_20160525T200005F._P

Stereo anaglyph from Navcam images May 25, 2016