APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

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APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by APOD Robot » Sat Jul 10, 2021 4:05 am

Image Mercury and the Da Vinci Glow

Explanation: On July 8th early morning risers saw Mercury near an old Moon low on the eastern horizon. On that date bright planet, faint glow of lunar night side, and sunlit crescent were captured in this predawn skyscape from Tenerife's Teide National Park in the Canary Islands. Never far from the Sun in planet Earth's sky, the fleeting inner planet shines near its brightest in the morning twilight scene. Mercury lies just below the zeta star of the constellation Taurus, Zeta Tauri, near the tip of the celestial bull's horn. Of course the Moon's ashen glow is earthshine, earthlight reflected from the Moon's night side. A description of earthshine, in terms of sunlight reflected by Earth's oceans illuminating the Moon's dark surface, was written over 500 years ago by Leonardo da Vinci. Waiting for the coming dawn in the foreground are the Teide Observatory's sentinels of the Sun, also known as (large domes left to right) the THEMIS, VTT, and GREGOR solar telescopes.

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by XgeoX » Sat Jul 10, 2021 11:49 am

This picture has a wonderful Parrish Blue in it…

Image

“Maxfield Parrish's art is characterized by vibrant colors; the color Parrish blue was named after him. He achieved such luminous color through glazing. This process involves applying alternating bright layers of translucent glaze separated by varnish over a base rendering. Parrish usually used a blue and white monochromatic underpainting.”


Eric

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by orin stepanek » Sat Jul 10, 2021 12:05 pm

IMG_2021_07_08_29558_APOD1024.jpg

That has to be the brightest i ever seen on a photo of Mercury taken
from Earth! Nicely done! :D
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Orin

Smile today; tomorrow's another day!

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by Sa Ji Tario » Sun Jul 11, 2021 3:48 am

I once read that with the light of the Earth you could read the newspaper on the Moon

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by alter-ego » Sun Jul 11, 2021 5:10 am

Sa Ji Tario wrote:
Sun Jul 11, 2021 3:48 am
I once read that with the light of the Earth you could read the newspaper on the Moon
The "full" Earth can be ~15x brighter than a full moon. People have claimed to read as small as ~ 12 pts font size during full moon. Assuming a 10pt font size for newspapers, I think what you read is plausible, especially with reading glasses :)
A pessimist is nothing more than an experienced optimist

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by Ann » Sun Jul 11, 2021 8:29 am

XgeoX wrote:
Sat Jul 10, 2021 11:49 am
This picture has a wonderful Parrish Blue in it…

Image

“Maxfield Parrish's art is characterized by vibrant colors; the color Parrish blue was named after him. He achieved such luminous color through glazing. This process involves applying alternating bright layers of translucent glaze separated by varnish over a base rendering. Parrish usually used a blue and white monochromatic underpainting.”


Eric
Wow, that's an absolutely amazing image! The water seems to glow from smoldering blue embers from within! :shock: :D

Ann
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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by XgeoX » Mon Jul 12, 2021 11:55 am

Ann wrote:
Sun Jul 11, 2021 8:29 am
XgeoX wrote:
Sat Jul 10, 2021 11:49 am
This picture has a wonderful Parrish Blue in it…

Image

“Maxfield Parrish's art is characterized by vibrant colors; the color Parrish blue was named after him. He achieved such luminous color through glazing. This process involves applying alternating bright layers of translucent glaze separated by varnish over a base rendering. Parrish usually used a blue and white monochromatic underpainting.”


Eric
Wow, that's an absolutely amazing image! The water seems to glow from smoldering blue embers from within! :shock: :D

Ann
Maxfield Parrish was a genius and my all time favorite artist! Please check out his work it is unbelievable!

Eric

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by XgeoX » Mon Jul 12, 2021 11:57 am

alter-ego wrote:
Sun Jul 11, 2021 5:10 am
Sa Ji Tario wrote:
Sun Jul 11, 2021 3:48 am
I once read that with the light of the Earth you could read the newspaper on the Moon
The "full" Earth can be ~15x brighter than a full moon. People have claimed to read as small as ~ 12 pts font size during full moon. Assuming a 10pt font size for newspapers, I think what you read is plausible, especially with reading glasses :)
Given that a full moon is 400,000 times fainter than the sun the 15x brighter than the full moon isn’t that great. I really doubt it could be read…
One way to settle it, let’s go and see for ourselves!

Eric

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by neufer » Mon Jul 12, 2021 2:13 pm

XgeoX wrote:
Mon Jul 12, 2021 11:57 am
alter-ego wrote:
Sun Jul 11, 2021 5:10 am
Sa Ji Tario wrote:
Sun Jul 11, 2021 3:48 am

I once read that with the light of the Earth you could read the newspaper on the Moon
The "full" Earth can be ~15x brighter than a full moon. People have claimed to read as small as ~ 12 pts font size during full moon. Assuming a 10pt font size for newspapers, I think what you read is plausible, especially with reading glasses :)
Given that a full moon is 400,000 times fainter than the sun the 15x brighter than the full moon isn’t that great. I really doubt it could be read…
The Earth would appear 13.4 times ( ~ 15 x) larger than the Moon (area wise);
however, it has an albedo 2.7 times greater: making it 36 times brighter.
https://en.wikipedia.org/wiki/Lux wrote:

Code: Select all

Illuminance (lux) 	Surfaces illuminated by
-------------------------------------------------
0.002 	Moonless clear night sky with airglow
0.25 	Full moon on a clear night
9.0	Full Earth on the Moon
50 	Family living room lights
80 	Office building hallway/toilet lighting
400 	Office lighting
400 	Sunrise or sunset on a clear day.
1000 	Overcast day; typical TV studio lighting
10,000–25,000 	Full daylight (not direct sun)
32,000–100,000 	Direct sunlight
(However, hardly anyone reads newspapers any more.)
Art Neuendorffer

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by alter-ego » Tue Jul 13, 2021 3:32 am

neufer wrote:
Mon Jul 12, 2021 2:13 pm
XgeoX wrote:
Mon Jul 12, 2021 11:57 am
alter-ego wrote:
Sun Jul 11, 2021 5:10 am


The "full" Earth can be ~15x brighter than a full moon. People have claimed to read as small as ~ 12 pts font size during full moon. Assuming a 10pt font size for newspapers, I think what you read is plausible, especially with reading glasses :)
Given that a full moon is 400,000 times fainter than the sun the 15x brighter than the full moon isn’t that great. I really doubt it could be read…
The Earth would appear 13.4 times ( ~ 15 x) larger than the Moon (area wise);
however, it has an albedo 2.7 times greater: making it 36 times brighter.
https://en.wikipedia.org/wiki/Lux wrote:

Code: Select all

Illuminance (lux) 	Surfaces illuminated by
-------------------------------------------------
0.002 	Moonless clear night sky with airglow
0.25 	Full moon on a clear night
9.0	Full Earth on the Moon
50 	Family living room lights
80 	Office building hallway/toilet lighting
400 	Office lighting
400 	Sunrise or sunset on a clear day.
1000 	Overcast day; typical TV studio lighting
10,000–25,000 	Full daylight (not direct sun)
32,000–100,000 	Direct sunlight
(However, hardly anyone reads newspapers any more.)
Well, too lazy to do the calc, and mistakenly landed on the wrong link. The detail makes reading easier, though. BTW, I'm one who still likes newspapers.
A pessimist is nothing more than an experienced optimist

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Re: APOD: Mercury and the Da Vinci Glow (2021 Jul 10)

Post by neufer » Tue Jul 13, 2021 3:35 pm

alter-ego wrote:
Tue Jul 13, 2021 3:32 am

BTW, I'm one who still likes newspapers.
  • The Seattle Times :?:
Art Neuendorffer