Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Io Shadow Transit Tonight

  • Please log in to reply
7 replies to this topic

#1 fcathell

fcathell

    Apollo

  • *****
  • topic starter
  • Posts: 1070
  • Joined: 30 Jul 2017
  • Loc: Tucson, AZ

Posted 19 August 2019 - 06:33 PM

There will be a shadow transit of Io tonight starting about 0300 UTC (8 PM PDT). The moon's shadow will appear on the eastern limb of Jupiter just a little after the hour for most locations.

 

Frank

Tucson


  • Francopoli likes this

#2 aa6ww

aa6ww

    Vanguard

  • *****
  • Posts: 2019
  • Joined: 23 Oct 2011
  • Loc: Sacramento, Calif.

Posted 19 August 2019 - 07:17 PM

I was just going to post this also. Awesome news. I'm using this site, which some say isn't accurate but so far it seems to be:

https://www.projectp.../jevent.htm#aug

Times in UTC:

I : Tra start: 20 Aug 2019 1:48
I : Sha start: 20 Aug 2019 3:02
I : Tra end : 20 Aug 2019 4:00
I : Sha end : 20 Aug 2019 5:14
I : Occ start: 20 Aug 2019 22:56

...Ralph

#3 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 81678
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 19 August 2019 - 10:54 PM

RASC Observer's Handbook 2019

 

1:49 I TrI
3:02 I ShI

4:00 I TrE
5:14 I ShE

 

Sky & Telescope August 2019 page 51

 

1:49 I.Tr.I
3:02 I.Sh.I
4:00 I.Tr.E
5:14 I.Sh.E

 

https://www.skyandte...cript-utility/#

 

01:50 UT, Io begins transit of Jupiter.
03:04 UT, Io's shadow begins to cross Jupiter.
04:02 UT, Io ends transit of Jupiter.
05:18 UT, Io's shadow leaves Jupiter's disk.

 

https://s22380.pcdn....phenTab2019.pdf

 

1:49 I.Tr.I 
3:02 I.Sh.I 
4:00 I.Tr.E 
5:14 I.Sh.E

 

http://shallowsky.com/galilean/

 

2019-08-19 21:57:04 -4: Io begins transit
1 transit, 1 shadow:
2019-08-19 23:02:04 -4: Io's shadow appears
2019-08-19 23:57:04 -4: Io ends transit
2019-08-20 01:20:04 -4: Io's shadow disappears


  • Redbetter likes this

#4 CeeKay

CeeKay

    Vostok 1

  • -----
  • Posts: 126
  • Joined: 03 Sep 2017
  • Loc: Vancouver, WA

Posted 19 August 2019 - 11:23 PM

Just came in from my balcony and witnessed it through my AR-102 - couldn't see Io, but saw the shadow. 



#5 fcathell

fcathell

    Apollo

  • *****
  • topic starter
  • Posts: 1070
  • Joined: 30 Jul 2017
  • Loc: Tucson, AZ

Posted 19 August 2019 - 11:43 PM

Great Io shadow transit tonight - still going on as I write this.  I caught Io just before clearing Jupiter when it was in the western limb darkening region. Seeing was excellent and the shadow was very black. Used my SW 102 Mak with 8 and 6mm eyepieces.

 

Frank

Tucson 



#6 Skyshooter

Skyshooter

    Viking 1

  • -----
  • Posts: 576
  • Joined: 06 Apr 2008
  • Loc: S. Utah, U.S.A.

Posted 19 August 2019 - 11:53 PM

Used my C8 with 9mm ortho and 13mm baader. Also used a 2x barlow with the Baader. Yes indeed, it was a beautiful sight. When Io finally cleared the limb it hung motionless for just a short while like a jewel. 

Also had a peek at Saturn, seeing was a little worse but not terrible. Don't forget the occultation of Zeta Tauri on the 25th. It will be in the wee hours of the morning for me but Lunar occultations, especially when 

the moon is a crescent,  have always been a treat for me. Check out August Sky and Tel for timings....

 

Cheers and Beers!

ED

 



#7 Redbetter

Redbetter

    Cosmos

  • *****
  • Posts: 7885
  • Joined: 16 Feb 2016
  • Loc: Central Valley, CA

Posted 20 August 2019 - 12:50 AM

Caught the latter portion of the transit tonight...timing just hasn't worked out with other things going on.  That was fine as the seeing was poor and I was using the 110, mostly at 154x due to the seeing, but sometimes up to 193x.  I could tell Io was there on the northern portion of the NEB some time before it reached the limb, but I couldn't quite "see" it in the seeing I had.  It is like that when the seeing is poor, I can readily sense something is odd, but when I try to examine it there is not enough contrast to make it stand out.  Once Io began reaching the darker portions of the limb the disc was obvious because it was noticeably brighter.  Of course, the shadow with its high contrast featured prominently throughout.   



#8 aa6ww

aa6ww

    Vanguard

  • *****
  • Posts: 2019
  • Joined: 23 Oct 2011
  • Loc: Sacramento, Calif.

Posted 20 August 2019 - 01:18 AM

Jupiter finally appeared in the sky at about 8:10pm tonight, the Io shadow was already happening for me. I was using my C6 with average seeing, i was able to clearly see the shadow at about 136x using my Explorer Scientific 11mm 82 deg eyepiece.

Seeing has a short spurt of clairity and better conditions by 8:45 or so and i was able to bump the magnification up to 170x which made all the difference in seeing both Io and its shadow. Lots of surface details for this short burst of clarity. By 9pm, the seeing fell off again and I went back to 135x.

I had my tracking going on my CG-4 with made the entire session very comfortable.

 

Pretty fun for a quick grab and go session tonight.

 

...Ralph




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics