Eratosthenes and the ghosts

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astroavani Brazil
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Eratosthenes and the ghosts

#1

Post by astroavani »


Image
Phantom craters are craters that have lost their characteristic shape, meaning a deep hole with high walls and often prominent central peaks. They are much more subtle, often difficult to recognize like the ghost I described in 2012.
In this photo we have two easily visible ghosts, they are, Wallace, in which the southeast walls are missing, and Stadius, already in a much more advanced stage of degradation, both indicated in the photo.
The right time to observe this class of craters is when they are close to the terminator, as at this moment, even small elevations and depressions in the ground are easily evident.
A ghost crater is a crater buried in lava, with only the crater rim visible or sometimes not even that.
How are they formed? Let's say a regular crater forms from an asteroid/meteor impact at some point. Thereafter, during the period of active volcanism on the Moon, lava eruptions in the area may fill the crater to the rim, leaving only the rim behind.
Many of these phantom craters were located on the moon, including the one I posted a new topic on Astrobin recently: https://www.astrobin.com/0fkqmh/, as well as was described in the book "Astrofotografia Amadora no Brasil, chap. 19, page 282".
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Re: Eratosthenes and the ghosts

#2

Post by messier 111 »


nice infos and photo , thx .
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Re: Eratosthenes and the ghosts

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Post by John Donne »


Wonderful image.
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Re: Eratosthenes and the ghosts

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Post by Makuser »


Hello Avani. Another superb lunar image from you with the C14 Edge telescope. An excellent capture of Crater Eratosthenes and the nearby ghosts with nice contrast and surface details. Thanks for sharing this with us on here Avani and I am always looking forward to viewing more of your great work.
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Re: Eratosthenes and the ghosts

#5

Post by Gordon »


Congratulations Avani on having your image selected as todays TSS APOD!

app.php/article/12-22-2021-tss-astropho ... of-the-day
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Re: Eratosthenes and the ghosts

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Post by helicon »


Nice image Avani and congrats on the APOD award!
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Re: Eratosthenes and the ghosts

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Post by Bigzmey »


Nice image and narrative Avani and congrats on the APOD award!
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Re: Eratosthenes and the ghosts

#8

Post by Bearcatrp »


Impressive photo as usual. Great explanation.
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Re: Eratosthenes and the ghosts

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Post by OzEclipse »


Excellent image Avani,
I alway enjoy your images. Such incredible detail.
Thank you and congratulations on the POTD
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Re: Eratosthenes and the ghosts

#10

Post by Ylem »


That's stunning Avani!

Looks like you took that from Lunar orbit!

Congratulations on the well deserved APOD!
Clear Skies,
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Re: Eratosthenes and the ghosts

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Post by John Donne »


APOD 👍👍👍
SCOPES :ES127 f7.5, SW100 f9 Evostar, ES80 F6, LXD75 8" f10 SCT, 2120 10" f10 SCT, ES152 f6.5.
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"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
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Re: Eratosthenes and the ghosts

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Post by Unitron48 »


Great capture...and informative read! Congrats on a well deserved APOD award!

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Re: Eratosthenes and the ghosts

#13

Post by jrkirkham »


Amazing capture and instructional comments. Congratulations on the APOD.
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Re: Eratosthenes and the ghosts

#14

Post by BABOafrica »


Congrats on the TSS APOD award.

Never heard of the ghost craters before.

Your image captured them perfectly.

BABO
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Re: Eratosthenes and the ghosts

#15

Post by astroavani »


BABOafrica wrote: Thu Dec 23, 2021 4:39 pm Congrats on the TSS APOD award.

Never heard of the ghost craters before.

Your image captured them perfectly.

BABO
Thank you all for feedback and it's always an honor to have an image selected for TSS APOD.
In fact, my colleague BABO, these ghosts that I mentioned are easily visible, there is the one that, as I said in the text, is totally buried by lava and is much more difficult to visualize. I read the post that I indicated that you will have an idea: https://www.astrobin.com/0fkqmh/
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Re: Eratosthenes and the ghosts

#16

Post by BABOafrica »


astroavani wrote: Thu Dec 23, 2021 11:11 pm
https://www.astrobin.com/0fkqmh/
That's an amazing shot. Thanks for the link. It's much clearer what you mean now.

BABO
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