Jump to content

740427863_Terminatorchallenge.jpg.2f4cb93182b2ce715fac5aa75b0503c8.jpg

Jupiter: The Oval BA and others


John
 Share

Recommended Posts

Excellent seeing conditions tonight enabling my 130mm refractor to tease out some pale oval features in the planets South Temperate Belt. One has been called the Oval BA by regular observers. I can see 3/4 others around it at 240x. Quite hard to spot but they pop into view when the seeing is at it's steadiest.

A couple of nice barges along the north edge of the North Equatorial Belt as well.

These image from Sky & Telescope back in August shows these pale oval features (and barges) along with moon transits happening at that time:

Jupiter moon events

Edited by John
  • Like 12
Link to comment
Share on other sites

Just an additional note on this. The Oval BA used to be a red coloured storm system, maybe the one sometimes called "Red Spot Jr" ?. It has changed it's colour over the past few years becoming pale / whitish recently. This has attracted the attention of researchers who are trying to work out the reasons for a "Temporal Evolution" of this systems colour.

 

Edited by John
  • Like 3
Link to comment
Share on other sites

Good stuff John. I’ve never had much luck spotting those, must try harder! I’ve had a heavy couple of months but things are settling down a bit now so hopefully from the weekend onwards I can start doing a bit more observing, particularly on Jupiter.

  • Thanks 1
Link to comment
Share on other sites

Just managed to get Neptune's moon Triton with the 130. Rather pleased with that - it's mag 13.4 dimmed to  13.7 by atmospheric extinction according to Stellarium but the limit for 130mm aperture seems to be 13.4 according to the calculators :icon_scratch:

I've no doubts that I've picked up Triton visually and it's position corresponds with Stellarium and Cartes du Ciel. Needed lots of magnification - 400x and even 600x used (crazy !!!).

Perhaps Stellarium's estimate of dimming is too pessimistic ?

Anyway, nice to spot Triton with the 5.1 inch scope :smiley:

stellarium-000.thumb.png.d3206f49b0b48d27eefacc82e108027e.png

 

Edited by John
  • Like 4
Link to comment
Share on other sites

  • 4 weeks later...

Just a quick bump: anyone else had any luck seeing these white ovals in the southern hemisphere of Jupiter ?

I've noticed them showing quite frequently in images of the planet, mostly when the GRS is on the other side.

I've not had a session with good enough seeing since this thread to pick them out again.

This image from @neil phillips shows them nicely:

 

Edited by John
Link to comment
Share on other sites

9 minutes ago, Stu said:

GRS on show tonight so perhaps the ovals won’t be visible? Tak is out for GRS anyway.

8.03:50 pm next one according to Luminos. 

 

Edited by Deadlake
Link to comment
Share on other sites

In Luminos just select Jupiter, then transits and zoom. While the oval BA aren’t specifically mentioned you can observe the rotation and see when they transit.

65CEF5C6-B437-4F1E-A22F-0A7F5F209EA2.png

 

206CEB4C-93FD-4091-BEBE-CEC3E88E556A.png

Edited by johninderby
  • Thanks 1
Link to comment
Share on other sites

58 minutes ago, Stu said:

Where do you see that? Is that a transit time?

it was, missed it as dad duties, but not the best time for seeing, there will be another time...
Next useful GRS Transit is 19 Oct @ 21:42:40. Cloud's permitting.

Link to comment
Share on other sites

18 minutes ago, johninderby said:

In Luminos just select Jupiter, then transits and zoom. While the oval BA aren’t specifically mentioned you can observe the rotation and see when they transit.

65CEF5C6-B437-4F1E-A22F-0A7F5F209EA2.png

 

206CEB4C-93FD-4091-BEBE-CEC3E88E556A.png

Thanks. Didn’t see Oval BA mentioned. The graphics on these things normally aren’t realistic other than GRS position, is that the case on this too or do they update it so the ovals are correctly represented?

Link to comment
Share on other sites

1 hour ago, Deadlake said:

8.03:50 pm next one according to Luminos. 

 

I assumed you were talking about Oval BA transits! I know full well when GRS transits…..

Link to comment
Share on other sites

7 minutes ago, Deadlake said:

it was, missed it as dad duties, but not the best time for seeing, there will be another time...
Next useful GRS Transit is 19 Oct @ 21:42:40. Cloud's permitting.

GRS actually looking pretty good tonight, still visible now of course.

Link to comment
Share on other sites

  • 3 weeks later...

I've never seen the Oval BA (I have never heard of it )  but last night with very good seeing I was able to clearly make out twelve distinct colour bands including the polar regions. This was while I was observing the lunar transit of Europa and the GRS across the face. The shadow was lagging slightly behind the GRS as they emerged on the left but gradually caught up with it as they crossed to be together as they exited. Two large dark brown barges (or ovals) above the north temperate zone added interest but not shown on this SkySafari image. Baader Morpheus 6.5mm in the 12 inch Dob gives the premium views... 

Screenshot_2021-11-05-07-30-21-67.thumb.png.74c2e0a52f82df4d53315a2982f0d3aa.png

 

Edited by Geoff Barnes
  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.