Starship Asterisk*

Ann wrote: ↑Sat Jun 17, 2023 8:26 am

alter-ego wrote: ↑Sat Jun 17, 2023 5:26 am

Ann wrote: ↑Fri Jun 16, 2023 4:33 am

Sunset to Sunrise over the Baltic Sea. Image Credit & Copyright: Bernd Pröschold (TWAN)

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Beautiful picture! But I very much recommend the vimeo!



That can't possibly be correct. In the vimeo, which was shot in Sweden, it seems to get dark around 8 p.m., and the Sun seems to rise around 6 a.m. It's not that dark anywhere in Sweden in June. I live in southernmost Sweden, where the summer nights are the darkest, and the Sun doesn't set here until just before 10 p.m., and it's broad daylight at 4 a.m.

I'd say that the vimeo was probably shot in April in Sweden.

Ann

Chris Peterson wrote: ↑Fri Jun 16, 2023 6:15 pm ...
The intensity of the light can be manipulated. The position of the Sun at sunrise, no. It is seen rising at 6am. That's consistent with April 5 (assuming a full Moon date) in southern Sweden.

These responses indicated to me there was some confusion somewhere. Ann thought that Summer daylight in Sweden was too long for the Vimeo exposures, Chris suggests a reasonable solution to this by proposing April as the month of the image, and lastly, the reference to "June full moon" removed from the main page. I love confusion (lol) so I joined this fray.

I've concluded that the APOD description is pretty messed up for whatever reason, and the image is really something way different.
I identified a narrow range of Vimeo frames that I think spells out the scoop here:

1. Manually scanning through Vimeo, I reconstructed the FoV in Stellarium and ultimately simulated the Vimeo constellations passage over time:
   → The sky field (excluding foreground) is ~135° x 44°
   → Discovered the big dipper swings a wide range through lower culmination during darkness which is not possible until roughtly Aug - Dec
2. Around 2:56 Vimeo time, I became aware of a bright object in Gemini (lower right):
   → I searched backward in 1-year increments until an object showed up.
   → Surprisingly, on Nov 25, 2010 (~19:20 for the frame I chose), an 81%-illuminated moon showed up in exactly the position of the unkown object! (Jupiter and Mars were never close)
   Note: I found no date/time for when the image sequence was taken. Only that Vimeo was uploaded on June 8, 2023.

Bottom line:

• I'm confident the combined constellation IDs and the spot-on circumstances of the moon position clinches the Fall timing of the Vimeo frames.
• Total exposure time is not ~11½ hours (as in the description), but instead around 17 hours (a lengthy Fall night). For my chosen location of
  Akersberga, Sweden, the sun sets on Nov 24 14:01UT and rises on Nov 25 7:09 UT or about 17 hours when the sun is below the horizon.
• Where exactly in the location in southern Sweden is not important. Location will affect sunrise/sunset times a little, but not so much the visible
  nighttime constellations or the nugget moon location in Gemini.

I think this will hold true but I'm bothered by such disagreement in the APOD description.

Thanks, alter-ego! I love your detective work!

Ann

alter-ego wrote: ↑Sat Jun 17, 2023 5:26 am

Ann wrote: ↑Fri Jun 16, 2023 4:33 am

Sunset to Sunrise over the Baltic Sea. Image Credit & Copyright: Bernd Pröschold (TWAN)

---

Beautiful picture! But I very much recommend the vimeo!

APOD Robot wrote:

To construct the timelapse image, 3296 video frames were recorded on the night of June's Full Moon between 7:04pm and 6:35am local time.

That can't possibly be correct. In the vimeo, which was shot in Sweden, it seems to get dark around 8 p.m., and the Sun seems to rise around 6 a.m. It's not that dark anywhere in Sweden in June. I live in southernmost Sweden, where the summer nights are the darkest, and the Sun doesn't set here until just before 10 p.m., and it's broad daylight at 4 a.m.

I'd say that the vimeo was probably shot in April in Sweden.

Ann

Chris Peterson wrote: ↑Fri Jun 16, 2023 6:15 pm ...
The intensity of the light can be manipulated. The position of the Sun at sunrise, no. It is seen rising at 6am. That's consistent with April 5 (assuming a full Moon date) in southern Sweden.

These responses indicated to me there was some confusion somewhere. Ann thought that Summer daylight in Sweden was too long for the Vimeo exposures, Chris suggests a reasonable solution to this by proposing April as the month of the image, and lastly, the reference to "June full moon" removed from the main page. I love confusion (lol) so I joined this fray.

I've concluded that the APOD description is pretty messed up for whatever reason, and the image is really something way different.
I identified a narrow range of Vimeo frames that I think spells out the scoop here:

1. Manually scanning through Vimeo, I reconstructed the FoV in Stellarium and ultimately simulated the Vimeo constellations passage over time:
   → The sky field (excluding foreground) is ~135° x 44°
   → Discovered the big dipper swings a wide range through lower culmination during darkness which is not possible until roughtly Aug - Dec
2. Around 2:56 Vimeo time, I became aware of a bright object in Gemini (lower right):
   → I searched backward in 1-year increments until an object showed up.
   → Surprisingly, on Nov 25, 2010 (~19:20 for the frame I chose), an 81%-illuminated moon showed up in exactly the position of the unkown object! (Jupiter and Mars were never close)
   Note: I found no date/time for when the image sequence was taken. Only that Vimeo was uploaded on June 8, 2023.

Bottom line:

• I'm confident the combined constellation IDs and the spot-on circumstances of the moon position clinches the Fall timing of the Vimeo frames.
• Total exposure time is not ~11½ hours (as in the description), but instead around 17 hours (a lengthy Fall night). For my chosen location of
  Akersberga, Sweden, the sun sets on Nov 24 14:01UT and rises on Nov 25 7:09 UT or about 17 hours when the sun is below the horizon.
• Where exactly in the location in southern Sweden is not important. Location will affect sunrise/sunset times a little, but not so much the visible
  nighttime constellations or the nugget moon location in Gemini.

I think this will hold true but I'm bothered by such disagreement in the APOD description.

Ann wrote: ↑Fri Jun 16, 2023 4:33 am

Sunset to Sunrise over the Baltic Sea. Image Credit & Copyright: Bernd Pröschold (TWAN)

---

Beautiful picture! But I very much recommend the vimeo!

APOD Robot wrote:

To construct the timelapse image, 3296 video frames were recorded on the night of June's Full Moon between 7:04pm and 6:35am local time.

That can't possibly be correct. In the vimeo, which was shot in Sweden, it seems to get dark around 8 p.m., and the Sun seems to rise around 6 a.m. It's not that dark anywhere in Sweden in June. I live in southernmost Sweden, where the summer nights are the darkest, and the Sun doesn't set here until just before 10 p.m., and it's broad daylight at 4 a.m.

I'd say that the vimeo was probably shot in April in Sweden.

Ann

Chris Peterson wrote: ↑Fri Jun 16, 2023 6:15 pm ...
The intensity of the light can be manipulated. The position of the Sun at sunrise, no. It is seen rising at 6am. That's consistent with April 5 (assuming a full Moon date) in southern Sweden.

1. Manually scanning through Vimeo, I reconstructed the FoV in Stellarium and ultimately simulated the Vimeo constellations passage over time:
   → The sky field (excluding foreground) is ~135° x 44°
   → Discovered the big dipper swings a wide range through lower culmination during darkness which is not possible until roughtly Aug - Dec
2. Around 2:56 Vimeo time, I became aware of a bright object in Gemini (lower right):
   → I searched backward in 1-year increments until an object showed up.
   → Surprisingly, on Nov 25, 2010 (~19:20 for the frame I chose), an 81%-illuminated moon showed up in exactly the position of the unkown object! (Jupiter and Mars were never close)
   Note: I found no date/time for when the image sequence was taken. Only that Vimeo was uploaded on June 8, 2023.

• I'm confident the combined constellation IDs and the spot-on circumstances of the moon position clinches the Fall timing of the Vimeo frames.
• Total exposure time is not ~11½ hours (as in the description), but instead around 17 hours (a lengthy Fall night). For my chosen location of
  Akersberga, Sweden, the sun sets on Nov 24 14:01UT and rises on Nov 25 7:09 UT or about 17 hours when the sun is below the horizon.
• Where exactly in the location in southern Sweden is not important. Location will affect sunrise/sunset times a little, but not so much the visible
  nighttime constellations or the nugget moon location in Gemini.

lefthip wrote: ↑Fri Jun 16, 2023 3:08 pm Yes, the Vimeo gives you the beautiful arc of the Northern lights, a very impressive sight.

Ann, don't forget that the colours and light intensity we see on the screen are adjusted by the operating system to give us the picture that it thinks? we should see. By making manual adjustments you might get what you are expecting.

Krukarius wrote: ↑Fri Jun 16, 2023 4:37 pm It looks like the aurora appeared by the nautical twilight. It's clearly seen by faint twilight glow and quite a lot of stars. It had to be somewhere at the very south of the country.
By the way, an effect perfectly resemble the situation in which an observer could watch the aurora during the 2026 total solar eclipse.
https://www.mkrgeo-blog.com/several-imp ... r-eclipse/

APOD Robot wrote:

To construct the timelapse image, 3296 video frames were recorded on the night of June's Full Moon between 7:04pm and 6:35am local time.