LtE in CMO #270

From Eric NG

. . . . . . . Date: Sun, 2 Mar 2003 04:08:43 +0800

Subject: 20030301 Europa Transit


Dear friends,


Attached was the Jupiter taken on 20030301 at 15:56 UT which showing the Europa Transit. You cans see Europa and it's shadow crossing the Jovian surface. A few more will be processed and posted here later on.


Kind Regards,


. . . . . . .Date: Sun, 2 Mar 2003 11:36:10 +0800Subject: Re: [ALPO_Jupiter] JUPITER IMAGES - HELP


As I am still a beginner in planets imaging and observation. I will try my best not to mix up between the standard orientation and my personal preference. Usually I processed two versions, one south up and one north up or even rotate the planet in 15 degree counter clockwise. South up is for ALPO group (file name with time in UT) while the north up for my local astro parties(file name UT-1).


My brain usually stucks especially when post the image at 4:00am morning after intensive imaging sections. I will keep it in mind when typing the link to ALPO next time.


Here is the correct link with south up orientation:


Thanks for your reminder. Please forgive my "mistakes" that may hindering the scientific analysis progress as you mentioned


Kind Regards,


. . . . . . .Date: Sun, 2 Mar 2003 17:09:19 +0800

Subject: Re: Jupiter image 23rd Feb 2003 - Join effort


Hi Weileong,


heheh. It is nice that our idea finally works fine. As the time window for

our 10" is within 1 minute, so it is nice that we can stack 1000 frames

instead of 500 frames by overlapping our images taken at different places

(Hong Kong and Singapore) at the same time.


Although last time my raw is inferior than yours. I promise I will give you

the more pleasing one next time or next time is your turn to send yours to



Seems for coming Mars, we can do the same thing.


Kind Regards,


. . . . . . .Date: Sun, 2 Mar 2003 18:19:33 +0800

Subject: another 20030301 Europa Transit


Dear friends,


Attached was another Europa transit taken on 20030301. The one taken at 14:48UT showing Europa near CM.


Kind Regards,


. . . . . . .Date: Mon, 3 Mar 2003 21:59:27 +0800

Subject: Re: Jupiter image 2nd March 2003


Dear Weileong,


Absolutely impressive especially for such low transparency. It is always

good to see the colour tone still can be kept consistent as low transparency

usually decrease the colour saturation!!! Great job!


The coming whole week in Hong Kong will has rainy days.


With my best luck to you as well as other regions. Clear skies to you all


. . . . . . .Date: Tue, 4 Mar 2003 09:54:32 +0800

Subject: Reprocessed 20030222 Jupiter


Dear friends,


Last night just share some processing experience with Weileong and I learnt

a lot from his kind expertise. Attached Jupiter was the reprocessed one

taken on 22 Feb, 2003. The details on EZ looks more pleasing as well as the

overall contrast has been improved.


Shairng and friendship are real treasure I got from astronomy.


Kind Regards,



. . . . . . .Date: Thu, 13 Mar 2003 02:38:55 +0800

Subject: 20030312 Jupiter


Dear Friends,


After 10 days cloudy night, finally the sky clear but the strong monsoon wind blew from North-East affecting Hong Kong leading to poor seeing. Attached was the Jupiter taken on March 12 at 17:06UT.


Very interesting feature inside the SEB disturbance. For the visibility of NTrB, seems the portion start at around 90 degree become obvious than the other side. I noted it by comparing my image (usually BA side) and the Weileong's image (GRS side).


Kind Rgards,


. . . . . . .Date: Thu, 13 Mar 2003 08:24:00 +0800

Subject: Re: 20030312 Jupiter (amendment)


Dear friends,

oops, Sorry. The time for the image should be 15:06, not 17:06. Wrong UT calculation. The CMI should be 358 and CMII should be 77





. . . . . . .Date: Thu, 13 Mar 2003 19:54:03 +0800

Subject: Another 20030312 Jupiter


Dear friends,


Another 220030312 Jupiter. GRS at the following side and note the prominent ovals at the south pole region.


Kind Regards,


. . . . . . .Date: Sat, 15 Mar 2003 00:35:34 +0800

Subject: 20030314 Jupiter & Ganymede shadow transit


Dear friends,

I thought I can sleep earlier tonight but finally went up for roof for waiting Ganymede transit. God blessed that Jupiter sometimes appeared on the sky through thin cloud. Seeing was not good and very windy. I captured several clips. Attached was the best processed version taken on 20030314 at 13:44UT. I am surprised that Ganymede detail can be seen though it was a noisy shot. Ganymede was slightly unsharp masked one more time than Jupiter.


Kind Regards,



. . . . . . .Date: Mon, 17 Mar 2003 17:45:39 +0800

Subject: 20030316 Jupiter


Dear friends,


Attached Jupiter were taken on 20030316. The transparency is low so the colour and contrast were not that pleasing. The NTrB is definitely more obvious than a month before, under the similar seeing condition, it was not captured in previous shots. Seeing was 4/10. Also I have taken the close up portrati of the Schroteri Valley (we call it Kitty on the moon). :-)


Kind Regards,


. . . . . . .Date: Tue, 18 Mar 2003 02:24:14 +0800

Subject: 20030317 Jupiter (cooled webcam shot)


Dea friends,


Attached was the Jupiter taken tonight. This shot was taken 21 mins earler than Weileong's. This is my highest resolution shot of GRS side.


This shot was taken with cooled webcam and I would say it does not help much in digitisation noise reduction, but it does help in reducing the dark noise for the blue channel. Without the cooled one, usually the image bais to blue tone that leading to hard processing.


Please feel free to comment on it.


Kind Regards,



. . . . . . .Date: Tue, 18 Mar 2003 03:20:59 +0800

Subject: Other two 20030317 Jupiter


Dear friends,


Here were other two 20030317 Jupiter. The resolution were similar to the previous one. Note the blue features and festoons on EZ are very active.


Kind Regards,



. . . . . . .Date: Tue, 25 Mar 2003 11:21:12 +0800

Subject: Re: Jupiter - March 24, 2003


Dear David,


Thanks for sharing. Splendid images!!! Your 10" Newtonian has very good optics which can be fully utilised by your imaging skill.


Eric NG (Hong Kong)

 Back to the LtE Home Page

 Jump to the LtE Archives


 Back to the CMO Home Page