APOD: Shadows Across Jupiter (2013 Feb 15)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4402
Joined: Fri Dec 04, 2009 3:27 am

APOD: Shadows Across Jupiter (2013 Feb 15)

Post by APOD Robot » Fri Feb 15, 2013 5:06 am

Image Shadows Across Jupiter

Explanation: Two dark shadows loom across the banded and mottled cloud tops of Jupiter in this sharp telescopic view. In fact, captured on January 3rd, about a month after the ruling gas giant appeared at opposition in planet Earth's sky, the scene includes the shadow casters. Visible in remarkable detail at the left are the large Galilean moons Ganymede (top) and Io. With the two moon shadows still in transit, Jupiter's rapid rotation has almost carried its famous Great Red Spot (GRS) around the planet's limb from the right. The pale GRS was preceded by the smaller but similar hued Oval BA, dubbed Red Spot Jr., near top center. North is down in the inverted image.

<< Previous APOD This Day in APOD Next APOD >>
[/b]

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Beyond » Fri Feb 15, 2013 5:17 am

Huh, i never realized that Io was red. Musta missed something somewhere.
To find the Truth, you must go Beyond.

User avatar
Ann
4725 Å
Posts: 11513
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Ann » Fri Feb 15, 2013 5:53 am

Beyond wrote:Huh, i never realized that Io was red. Musta missed something somewhere.
Io is actually yellow, though with red markings on it.

Today's APOD is very nice. It's fascinating that Jupiter's two hemispheres are so different. Just look at all the ovals that floating around in the southern half (at top in today's image). There are virtually none in the other hemisphere. Fascinating!

Ganymede and Io sure look great here! :D

I love the large blue-grey "festoon", which is seen right at Jupiter's "navel". This festoon, apart from having a nice color, looks eerily like a steam ship, sailing a "sea of brown". (Now who sang "a sea of green" - was it the Beatles?)

Ann
Color Commentator

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Boomer12k » Fri Feb 15, 2013 7:47 am

Beyond wrote:Huh, i never realized that Io was red. Musta missed something somewhere.
Go to your google search, click IMAGES tab and type in IO, I think you will see what you missed.

Also search Why is Io yellow, or Red.

It is probably a little overexposed in this picture.

:---[===] *

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Boomer12k » Fri Feb 15, 2013 7:48 am

Who do I have to kill to get a photo like that?????

Not that I would...mind you...

:---[===] *

saturno2
Commander
Posts: 703
Joined: Wed Jun 29, 2011 10:05 pm

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by saturno2 » Fri Feb 15, 2013 8:44 am

Ganymede and Io in a image very interesting of Jupiter.
Jupiter has rapid rotation aprox. 10 hours for cycle.
Much speed for we.

User avatar
MargaritaMc
Look to the Evenstar
Posts: 1836
Joined: Wed Jan 09, 2013 10:14 pm
Location: 28°16'7"N 16°36'20"W

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by MargaritaMc » Fri Feb 15, 2013 8:54 am

Ann asked This festoon, apart from having a nice color, looks eerily like a steam ship, sailing a "sea of brown". (Now who sang "a sea of green" - was it the Beatles?)
Yes! In the song 'Yellow Submarine'.
Click to play embedded YouTube video.
I can fancifully imagine having a jovian submarine to go beneath those clouds...

M.
"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
&mdash; Dr Debra M. Elmegreen, Fellow of the AAAS

User avatar
MargaritaMc
Look to the Evenstar
Posts: 1836
Joined: Wed Jan 09, 2013 10:14 pm
Location: 28°16'7"N 16°36'20"W

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by MargaritaMc » Fri Feb 15, 2013 11:14 am

"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
&mdash; Dr Debra M. Elmegreen, Fellow of the AAAS

OrionEridanus

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by OrionEridanus » Fri Feb 15, 2013 5:12 pm

It is amazing to me that this is a ground based "backyard" astronomer image. Wow. Wow. Wow.

http://www.damianpeach.com/observatory.htm

jm3

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by jm3 » Fri Feb 15, 2013 5:44 pm

I'm thinking a circular shadow projected onto a sphere should look more oval shaped. Any ideas why it's a circle?

User avatar
geckzilla
Ocular Digitator
Posts: 9158
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by geckzilla » Fri Feb 15, 2013 6:00 pm

jm3 wrote:I'm thinking a circular shadow projected onto a sphere should look more oval shaped. Any ideas why it's a circle?
Try taking a couple of spheres yourself and using them to cast shadows on one another. Depending on where you are looking at them from and how the shadow is projected it could look perfectly circular or very elongated. Since we can't reach into the picture and rotate it around it's difficult for our brains to place the objects three dimensionally.
Just call me "geck" because "zilla" is like a last name.

User avatar
Chris Peterson
Abominable Snowman
Posts: 16128
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Chris Peterson » Fri Feb 15, 2013 6:03 pm

jm3 wrote:I'm thinking a circular shadow projected onto a sphere should look more oval shaped. Any ideas why it's a circle?
Because we are almost directly in line with the Sun and the bodies casting the shadows. From such a perspective, the shadows will always have the same shape as the bodies that cast them. In fact, the shadows are quite oval- but because we are viewing them obliquely, they appear round.
Chris

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

Craig Willford

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by Craig Willford » Fri Feb 15, 2013 6:48 pm

I know this is off-topic for the Jupiter picture shown as today's APOD but my question cannot wait until tomorrow or later when the asteroid fly-by is past tense and images start coming in.

What I would like is a website that would allow me to put in my Latitude and Longitude and give me a star chart showing the asteroid fly-by path with time ticks in either Universal Time or local time.

I have a moderate telescope that should be able to easily see the thing at 7.4 magnitude, but I need to know where to look.

Sincerely,

Craig Willford

User avatar
bystander
Apathetic Retiree
Posts: 20753
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by bystander » Fri Feb 15, 2013 7:25 pm

Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

andresgris

Re: APOD: Shadows Across Jupiter (2013 Feb 15)

Post by andresgris » Fri Feb 15, 2013 8:25 pm

At first I was wondering why Jupiter's bands appear mostly straight, given that we're both on the ecliptic. It appears the answer is that Jupiter's axial tilt is only 3 degrees! No wonder it has such strong latitudinal zonation...