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Astrophotography and Sketching >> Sketching

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maroubra_boy
professor emeritus


Reged: 09/08/09

Loc: Sydney, Australia
Bay of Rainbows, and a torent of lava flows!
      #5873451 - 05/20/13 10:42 AM Attachment (21 downloads)

Hi all,

How they named these features, I've got no idea.

Still, being three days after first 1/4 Moon, the Northern mountains forming Sinus Iridum shone out like a beacon. A really stunning feature this enourmous mountain range, Montes Jura, that rose out of the darkness of the terminator. Very striking indeed, with the arc of disconnected beads of light reaching out of the dark.

Sinus Iridum while seemingly featureless has a wealth of Lunar history to tell. It is the result of a very, very ancient massive impact that resulted in its floor being completely flooded by lava. BUT, it is much older than the neighbouring Mare Inbrium (Sea of showers). The hint to Iridum's antiquity comes from the Wrinkle Ridges that span its width. Wrinkle Ridges are the terminator line of lava flows. These lava flow stop-lines all run somewhat concentric from their origin within Mare Inbrium. As such, the floor of Sinus Iridum lies some 600m below that of the mean height of Mare Inbrium!

Volcanism within Iridum also didn't finish with its flooding. There are at least four "domes" or volcanos within it, one of which I've captured in my sketch, in the top left quadrant of Iridum, a tiny double lobed feature which is Heraclides 4 (the volcano, 3km dia.) and Heraclides E (4km dia.) [Promontorium Heraclides is the southern spur of the Montes Jura chain that surrounds Iridum]. The four main volcanic vents within Iridum all lie to the west of the line of wrinkle ridges that flow into it. Quite a story book of history this area.

While bereft of big impact craters, long examination of the area begins to reveal a patchwork of small ray craters. These are around the 3 to 5km mark in diameter, but their ray systems extends a little further out. These ray craters are all relatively new impacts.

I hope you enjoy this sketch.

Object: Sinus Iridum & Montes Jura (North is down)

Scope: C8, 8" SCT
Gear: 8mm Celestron Ultima LX, 250X
Date: 20th May, 2013
Location: Sydney, Oz
Duration: 1hr 50min
Media: White & grey soft pastel, black charcoal and white ink on A4 size black paper.


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frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5873467 - 05/20/13 10:53 AM

Alex,

Wow, how about that view? Your capture here is stunning. There is so much visible here and it is total quality for a lunar sketch.
What are the dimensions of the paper you used?
Super work.

Frank


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maroubra_boy
professor emeritus


Reged: 09/08/09

Loc: Sydney, Australia
Re: Bay of Rainbows, and a torent of lava flows! new [Re: frank5817]
      #5873479 - 05/20/13 10:59 AM

The page is 21cm wide by 28cm tall. The sketch however is roughly 17cm (7") tall.

While seeing was really, well, *BLEEP*, by the end I just had to obey my eyes and stop. Details just kept on coming and coming in fits and spasms as the seeing cleared momentarily. A pain in the neck, but I'm somewhat grateful - would have damn near killed me,


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frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5873622 - 05/20/13 12:21 PM

Alex,

You have good eyesight and a steady hand. You get those tones perfectly captured.
I was expecting the sketch to be larger which means in the size you rendered it was much more difficult.
My hat is off to you- spectacular.

Frank


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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5873684 - 05/20/13 12:53 PM

Alex,

Very nice sketch of the Moon .

CS,KLU,

,

Tom


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Aquarellia
professor emeritus


Reged: 10/27/12

Loc: Provence, France
Re: Bay of Rainbows, and a torent of lava flows! new [Re: niteskystargazer]
      #5873720 - 05/20/13 01:06 PM

How Alex, thanks to show us this sketch. And the geological story book with it ! We are in Apollo 2013 with you ! Super work indeed !
Michel


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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Bay of Rainbows, and a torent of lava flows! new [Re: Aquarellia]
      #5874149 - 05/20/13 04:22 PM

Very nice.

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kenrenard
Carpal Tunnel


Reged: 12/13/12

Loc: Dunmore, PA
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Rutilus]
      #5874690 - 05/20/13 09:01 PM

Alex,
Great work. Amazing detail. Everything has such depth.

Ken


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Uwe Pilz
scholastic sledgehammer


Reged: 05/16/08

Loc: Leipzig, Germany
Re: Bay of Rainbows, and a torent of lava flows! new [Re: kenrenard]
      #5875011 - 05/21/13 12:03 AM

You captured the ridges very well. I never tried to sketch such a large area.

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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Uwe Pilz]
      #5875138 - 05/21/13 04:51 AM

Impressive!!

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Aperturefever
super member


Reged: 12/12/10

Loc: Lake Macquarie, Australia
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Jef De Wit]
      #5875194 - 05/21/13 06:13 AM

Another pearler mate.
You make me scared to take on the moon! Have loved learning about its creation during recent lectures - nothing like a good collision with another Mars-sized planet to give us soemthing to draw!


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Aperturefever]
      #5875254 - 05/21/13 07:22 AM

Alex.

You are in admiration with my sun sketches, but I'm in admiration with your sketches. This sketch is superb, I love it so much. So much details. Congrats.

Andre.


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ericj
professor emeritus


Reged: 02/17/05

Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5880192 - 05/23/13 01:00 PM

Really nice sketch Alex, Sinus Iridum is one of my favorites when observing the Moon.

Best,

Eric Jamison


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maroubra_boy
professor emeritus


Reged: 09/08/09

Loc: Sydney, Australia
Re: Bay of Rainbows, and a torent of lava flows! new [Re: ericj]
      #5881112 - 05/23/13 09:01 PM

Thank you for the comments, everyone.

Aperture, not like you to resist a challenge, eh!


I've just added a link in my signature down below, to a little gallery of my work that I've started up. You are all most welcome to have a look at some of my stuff.

Alex.


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5881190 - 05/23/13 09:52 PM

Wow Alex, its really exceptionnal what you did. Your moon sketches are incredible. Congratulation my friend, you have a so great talent.

Andre.


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markseibold
Carpal Tunnel


Reged: 01/19/08

Loc: Portland Oregon
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5881413 - 05/24/13 12:13 AM

Alex

Beautiful details that you captured in your sketch. Sinus Iridum is my favorite feature for only a single night or a few hours once a month. Every time I observe it at medium magnification, I think of sketching it. It's more so the lava flows and little rifts along those shadows that get my artistic desires going. You've rendered them quite well here.

Thanks for also sharing the great geological history about that region.

Mark


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: Bay of Rainbows, and a torent of lava flows! new [Re: markseibold]
      #5881557 - 05/24/13 02:19 AM

Alex.

I looked at all you sketches and some using the resolution tool to magnify. Man you are a real master in sketching the beauties of the sky. You globs are simply amazing and fantastic. Your moon's sketches are so beautiful and real, its hard to believe a pencil can do that.

All my sincere congratulation Alex.

Andre.


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JeanB
Pooh-Bah


Reged: 07/11/11

Loc: Montreal, Canada
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Andrev]
      #5881944 - 05/24/13 10:30 AM

Quite an impressive sketch, Alex!

Jean


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Aperturefever
super member


Reged: 12/12/10

Loc: Lake Macquarie, Australia
Re: Bay of Rainbows, and a torent of lava flows! new [Re: maroubra_boy]
      #5883190 - 05/24/13 10:15 PM

Quote:


Aperture, not like you to resist a challenge, eh!

Alex.



Ok. You've twisted my arm. But I'll have to sort my technique out at the study desk before I climb up on the Catsperch. You've set a crackingly high standard ....


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JimPie
professor emeritus


Reged: 11/10/07

Loc: S.E.Michigan
Re: Bay of Rainbows, and a torent of lava flows! new [Re: Aperturefever]
      #5883416 - 05/25/13 01:47 AM

Fabulous sketch Alex!

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