Jump to content


Photo

Bay of Rainbows, and a torent of lava flows!

  • Please log in to reply
20 replies to this topic

#1 maroubra_boy

maroubra_boy

    Vendor - Gondwana Telescopes

  • -----
  • Vendors
  • Posts: 531
  • Joined: 08 Sep 2009
  • Loc: Sydney, Australia

Posted 20 May 2013 - 09:42 AM

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.

Attached Files



#2 frank5817

frank5817

    Cosmos

  • *****
  • Posts: 8368
  • Joined: 13 Jun 2006
  • Loc: Illinois

Posted 20 May 2013 - 09:53 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 :)

#3 maroubra_boy

maroubra_boy

    Vendor - Gondwana Telescopes

  • -----
  • Vendors
  • Posts: 531
  • Joined: 08 Sep 2009
  • Loc: Sydney, Australia

Posted 20 May 2013 - 09:59 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, :lol:

#4 frank5817

frank5817

    Cosmos

  • *****
  • Posts: 8368
  • Joined: 13 Jun 2006
  • Loc: Illinois

Posted 20 May 2013 - 11:21 AM

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 :)

#5 niteskystargazer

niteskystargazer

    Gemini

  • *****
  • Posts: 3045
  • Joined: 05 Oct 2009
  • Loc: 41-43'-28" N 87-42'-39" W

Posted 20 May 2013 - 11:53 AM

Alex,

Very nice sketch of the Moon :).

CS,KLU,

:thanx:,

Tom

#6 Aquarellia

Aquarellia

    Viking 1

  • -----
  • Posts: 752
  • Joined: 27 Oct 2012
  • Loc: Provence, France

Posted 20 May 2013 - 12:06 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

#7 Rutilus

Rutilus

    Surveyor 1

  • -----
  • Posts: 1859
  • Joined: 17 Dec 2010

Posted 20 May 2013 - 03:22 PM

Very nice.

#8 kenrenard

kenrenard

    Surveyor 1

  • -----
  • Posts: 1562
  • Joined: 13 Dec 2012
  • Loc: Dunmore, PA

Posted 20 May 2013 - 08:01 PM

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

Ken

#9 Uwe Pilz

Uwe Pilz

    Viking 1

  • *****
  • Posts: 998
  • Joined: 16 May 2008
  • Loc: Leipzig, Germany

Posted 20 May 2013 - 11:03 PM

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

#10 Jef De Wit

Jef De Wit

    Mercury-Atlas

  • *****
  • Posts: 2728
  • Joined: 06 Mar 2009
  • Loc: Hove, Belgium

Posted 21 May 2013 - 03:51 AM

Impressive!!

#11 Aperturefever

Aperturefever

    Vostok 1

  • -----
  • Posts: 154
  • Joined: 12 Dec 2010
  • Loc: Lake Macquarie, Australia

Posted 21 May 2013 - 05:13 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!

#12 Andrev

Andrev

    Skylab

  • *****
  • Posts: 4113
  • Joined: 08 Feb 2011
  • Loc: Montreal, Quebec, Canada

Posted 21 May 2013 - 06:22 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.

#13 ericj

ericj

    Viking 1

  • -----
  • Posts: 663
  • Joined: 17 Feb 2005

Posted 23 May 2013 - 12:00 PM

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

Best,

Eric Jamison

#14 maroubra_boy

maroubra_boy

    Vendor - Gondwana Telescopes

  • -----
  • Vendors
  • Posts: 531
  • Joined: 08 Sep 2009
  • Loc: Sydney, Australia

Posted 23 May 2013 - 08:01 PM

Thank you for the comments, everyone.

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


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.

#15 Andrev

Andrev

    Skylab

  • *****
  • Posts: 4113
  • Joined: 08 Feb 2011
  • Loc: Montreal, Quebec, Canada

Posted 23 May 2013 - 08:52 PM

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

Andre.

#16 markseibold

markseibold

    Surveyor 1

  • -----
  • Posts: 1572
  • Joined: 19 Jan 2008
  • Loc: Portland Oregon

Posted 23 May 2013 - 11:13 PM

Alex

Beautiful details that you captured in your sketch. :bow: 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

#17 Andrev

Andrev

    Skylab

  • *****
  • Posts: 4113
  • Joined: 08 Feb 2011
  • Loc: Montreal, Quebec, Canada

Posted 24 May 2013 - 01:19 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.

#18 JeanB

JeanB

    Apollo

  • -----
  • Posts: 1330
  • Joined: 11 Jul 2011
  • Loc: Montreal, Canada

Posted 24 May 2013 - 09:30 AM

Quite an impressive sketch, Alex!

Jean

#19 Aperturefever

Aperturefever

    Vostok 1

  • -----
  • Posts: 154
  • Joined: 12 Dec 2010
  • Loc: Lake Macquarie, Australia

Posted 24 May 2013 - 09:15 PM

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

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 .... :shocked:

#20 JimPie

JimPie

    Viking 1

  • -----
  • Posts: 522
  • Joined: 10 Nov 2007
  • Loc: S.E.Michigan

Posted 25 May 2013 - 12:47 AM

Fabulous sketch Alex!

#21 JayinUT

JayinUT

    I'm not Sleepy

  • *****
  • Posts: 3933
  • Joined: 19 Sep 2008
  • Loc: Utah

Posted 25 May 2013 - 10:34 PM

Alex,

Like a very fine wine, your sketching only continues to improve. Love this one. I hope to post some sketches up this weekend.

Jay






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics