APOD: Comet Leonard from Space (2021 Dec 15)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4647
Joined: Fri Dec 04, 2009 3:27 am

APOD: Comet Leonard from Space (2021 Dec 15)

Post by APOD Robot » Wed Dec 15, 2021 5:05 am

Image Comet Leonard from Space

Explanation: What does Comet Leonard look like from space? Today's featured image from Origin.Space's Yangwang-1 space telescope shows not only the currently bright comet -- but several other space delights as well. Taken in optical and ultraviolet light, C/2021 A1 (Leonard) is visible with an extended tail near the image center as it appeared five days ago. The Earth is visible on the lower right, while layers of the Earth's atmosphere glow diagonally from the lower left to the upper right. The trails of two satellites can be seen in front of a myriad of distant stars that dot the background on the upper left. The faint bands of light running diagonally from the lower right to the upper left are auroras. Finally, the image also caught a meteor streaking just below the airglow. To see Comet Leonard yourself from the Earth's surface during the next few days, look toward the western horizon just after sunset or just before sunrise.

<< Previous APOD This Day in APOD Next APOD >>

Locutus76
Asternaut
Posts: 6
Joined: Tue Aug 14, 2018 1:10 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Locutus76 » Wed Dec 15, 2021 11:40 am

There seems to be another sattelite visible on the upper right

User avatar
orin stepanek
Plutopian
Posts: 7435
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by orin stepanek » Wed Dec 15, 2021 1:10 pm

LeonardSpace_Yangwang1_1960.jpg
Almost a Christmas Comet! Westward leading!
My eyes can't spot things that small; so thanks for APOD!
smiling-cat-for-web.jpg
Pretty Kitty!
You do not have the required permissions to view the files attached to this post.
Last edited by orin stepanek on Wed Dec 15, 2021 4:48 pm, edited 1 time in total.
Orin

Smile today; tomorrow's another day!

Sa Ji Tario

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Sa Ji Tario » Wed Dec 15, 2021 3:11 pm

So anyone! If I climb the tree on the highest hill, I would see the same thing! (a Lepero)

osgilbert

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by osgilbert » Wed Dec 15, 2021 3:17 pm

I would love it if the rollover displaying the annotations was activated when my cursor was ON the image, so that the annotations could be included in a saved JPG, rather than activated only when OFF the image.

Sa Ji Tario

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Sa Ji Tario » Wed Dec 15, 2021 3:30 pm

If you wish, you can make a "screenshot", save it and have it when you like

User avatar
Chris Peterson
Abominable Snowman
Posts: 16596
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Chris Peterson » Wed Dec 15, 2021 3:33 pm

osgilbert wrote: Wed Dec 15, 2021 3:17 pm I would love it if the rollover displaying the annotations was activated when my cursor was ON the image, so that the annotations could be included in a saved JPG, rather than activated only when OFF the image.
If you look at the page source you can see the underlying names for both files. The annotated version is at https://apod.nasa.gov/apod/image/2112/L ... otated.jpg
_
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
Astronymus
Science Officer
Posts: 126
Joined: Wed Nov 10, 2010 10:26 pm
AKA: Astro
Location: Alps

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Astronymus » Wed Dec 15, 2021 8:52 pm

Locutus76 wrote: Wed Dec 15, 2021 11:40 am There seems to be another sattelite visible on the upper right
Also a weak streak on the left. And something in the right lower corner.
»Only a dead Earth is a good Earth.«

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Thu Dec 16, 2021 12:51 am

Astronymus wrote: Wed Dec 15, 2021 8:52 pm
Locutus76 wrote: Wed Dec 15, 2021 11:40 am There seems to be another sattelite visible on the upper right
Also a weak streak on the left. And something in the right lower corner.
I see them all but your additional “weak streak on the left”. Mind pointing it out with a pic?
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

Sa Ji Tario

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Sa Ji Tario » Thu Dec 16, 2021 2:40 am

Enlarge the image and you will see it

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Thu Dec 16, 2021 3:31 pm

Sa Ji Tario wrote: Thu Dec 16, 2021 2:40 am Enlarge the image and you will see it
I did that of course, but I still didn't see it. Is you divide the image into a 3 by 3 grid of squares, which one is it in? With the squares numbered like so:

Code: Select all

123
456
789
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 1031
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by alter-ego » Fri Dec 17, 2021 5:13 am

johnnydeep wrote: Thu Dec 16, 2021 3:31 pm
Sa Ji Tario wrote: Thu Dec 16, 2021 2:40 am Enlarge the image and you will see it
I did that of course, but I still didn't see it. Is you divide the image into a 3 by 3 grid of squares, which one is it in? With the squares numbered like so:

Code: Select all

123
456
789
Square 1
Two meteors are in that square. The faint one is to the left and up (~30° wrt the brighter one)
A pessimist is nothing more than an experienced optimist

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Fri Dec 17, 2021 3:37 pm

alter-ego wrote: Fri Dec 17, 2021 5:13 am
johnnydeep wrote: Thu Dec 16, 2021 3:31 pm
Sa Ji Tario wrote: Thu Dec 16, 2021 2:40 am Enlarge the image and you will see it
I did that of course, but I still didn't see it. Is you divide the image into a 3 by 3 grid of squares, which one is it in? With the squares numbered like so:

Code: Select all

123
456
789
Square 1
Two meteors are in that square. The faint one is to the left and up (~30° wrt the brighter one)
With that hint I was able to find one likely meteor in square 1, and a possible second one, but I'm not sure if they're the same ones you're referring to. Also, inverting the colors always seems to help me find things better. So, in the blowup of a part of square 1 below, the red circle shows the satellite and the two green circles show my candidate meteors:

satelllite and meteors.png

...oh, and I also spelled satellite correctly, unlike the annotated image :)
You do not have the required permissions to view the files attached to this post.
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
Chris Peterson
Abominable Snowman
Posts: 16596
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Chris Peterson » Fri Dec 17, 2021 4:29 pm

johnnydeep wrote: Fri Dec 17, 2021 3:37 pm
alter-ego wrote: Fri Dec 17, 2021 5:13 am
johnnydeep wrote: Thu Dec 16, 2021 3:31 pm

I did that of course, but I still didn't see it. Is you divide the image into a 3 by 3 grid of squares, which one is it in? With the squares numbered like so:

Code: Select all

123
456
789
Square 1
Two meteors are in that square. The faint one is to the left and up (~30° wrt the brighter one)
With that hint I was able to find one likely meteor in square 1, and a possible second one, but I'm not sure if they're the same ones you're referring to. Also, inverting the colors always seems to help me find things better. So, in the blowup of a part of square 1 below, the red circle shows the satellite and the two green circles show my candidate meteors:


satelllite and meteors.png


...oh, and I also spelled satellite correctly, unlike the annotated image :)
It's pretty unlikely that there would be more than one meteor in an image like this (indeed, having even one is unlikely). All the other streaks are probably either satellites or cosmic ray hits.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Fri Dec 17, 2021 4:36 pm

Chris Peterson wrote: Fri Dec 17, 2021 4:29 pm
johnnydeep wrote: Fri Dec 17, 2021 3:37 pm
alter-ego wrote: Fri Dec 17, 2021 5:13 am
Square 1
Two meteors are in that square. The faint one is to the left and up (~30° wrt the brighter one)
With that hint I was able to find one likely meteor in square 1, and a possible second one, but I'm not sure if they're the same ones you're referring to. Also, inverting the colors always seems to help me find things better. So, in the blowup of a part of square 1 below, the red circle shows the satellite and the two green circles show my candidate meteors:

satellite and meteors.png

...oh, and I also spelled satellite correctly, unlike the annotated image :)
It's pretty unlikely that there would be more than one meteor in an image like this (indeed, having even one is unlikely). All the other streaks are probably either satellites or cosmic ray hits.
Chris, always the voice of reason. Would there be any particular reason why the upper satellite streak (that would be the one in the red circle in my blow-up) appears dotted and not continuous like all the other streaks?
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
Chris Peterson
Abominable Snowman
Posts: 16596
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Chris Peterson » Fri Dec 17, 2021 5:12 pm

johnnydeep wrote: Fri Dec 17, 2021 4:36 pm
Chris Peterson wrote: Fri Dec 17, 2021 4:29 pm
johnnydeep wrote: Fri Dec 17, 2021 3:37 pm

With that hint I was able to find one likely meteor in square 1, and a possible second one, but I'm not sure if they're the same ones you're referring to. Also, inverting the colors always seems to help me find things better. So, in the blowup of a part of square 1 below, the red circle shows the satellite and the two green circles show my candidate meteors:

satellite and meteors.png

...oh, and I also spelled satellite correctly, unlike the annotated image :)
It's pretty unlikely that there would be more than one meteor in an image like this (indeed, having even one is unlikely). All the other streaks are probably either satellites or cosmic ray hits.
Chris, always the voice of reason. Would there be any particular reason why the upper satellite streak (that would be the one in the red circle in my blow-up) appears dotted and not continuous like all the other streaks?
Some satellites spin, either by design or by failure. Many of those appear to pulsate.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Fri Dec 17, 2021 7:23 pm

Chris Peterson wrote: Fri Dec 17, 2021 5:12 pm
johnnydeep wrote: Fri Dec 17, 2021 4:36 pm
Chris Peterson wrote: Fri Dec 17, 2021 4:29 pm

It's pretty unlikely that there would be more than one meteor in an image like this (indeed, having even one is unlikely). All the other streaks are probably either satellites or cosmic ray hits.
Chris, always the voice of reason. Would there be any particular reason why the upper satellite streak (that would be the one in the red circle in my blow-up) appears dotted and not continuous like all the other streaks?
Some satellites spin, either by design or by failure. Many of those appear to pulsate.
Thanks - makes sense, and very reasonable.
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
Astronymus
Science Officer
Posts: 126
Joined: Wed Nov 10, 2010 10:26 pm
AKA: Astro
Location: Alps

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Astronymus » Sat Dec 18, 2021 9:49 pm

johnnydeep wrote: Thu Dec 16, 2021 12:51 am
Astronymus wrote: Wed Dec 15, 2021 8:52 pm
Locutus76 wrote: Wed Dec 15, 2021 11:40 am There seems to be another sattelite visible on the upper right
Also a weak streak on the left. And something in the right lower corner.
I see them all but your additional “weak streak on the left”. Mind pointing it out with a pic?
Sure.

Image
»Only a dead Earth is a good Earth.«

User avatar
johnnydeep
Captain
Posts: 1214
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by johnnydeep » Sun Dec 19, 2021 3:24 pm

Astronymus wrote: Sat Dec 18, 2021 9:49 pm
johnnydeep wrote: Thu Dec 16, 2021 12:51 am
Astronymus wrote: Wed Dec 15, 2021 8:52 pm
Also a weak streak on the left. And something in the right lower corner.
I see them all but your additional “weak streak on the left”. Mind pointing it out with a pic?
Sure.

Image
I did eventually find that streak (see my earlier post) and yet another even fainter one to the above left right of that one. But they're probably not meteors as Chris pointed out.
Last edited by johnnydeep on Sun Dec 19, 2021 3:52 pm, edited 1 time in total.
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
Chris Peterson
Abominable Snowman
Posts: 16596
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Comet Leonard from Space (2021 Dec 15)

Post by Chris Peterson » Sun Dec 19, 2021 3:33 pm

johnnydeep wrote: Sun Dec 19, 2021 3:24 pm I did eventually find that streak (see my earlier post) and yet another even fainter one to the above left of that one. But they're probably not meteors as Chris pointed out.
Also worth keeping in mind, the airglow layer is somewhat higher than 100 km, and meteors are unlikely to be visible higher than that.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com