LtE in CMO #281

From Eric NG



. . . . . . .Date: Sun, 19 Oct 2003 12:02:47 +0800

Subject: 20031018 Saturn

 

Dear friends,

 

Last night arrived the observing site lately, so missed the god of war. No choice, wait for Saturn and Jupiter. Seeing was below average (4-5/10) and transparency was low (some haze). No encke division visible. The globe bands were washed out due to low signal to noise ratio. Two reasons: low transparency & too high focal ratio (5X powermate). I shall use the 4X powermate to achieve F27 and try in coming morning.

 

The south equatorial belt is vividly shown with reddish tone.

 

http://www.ort.cuhk.edu.hk/ericng/saturn-200310182046UT-eric.jpg

 

Feel free to comment.

 

P.S. I shall post the Jupiter shot later on. But very very bad quality as it was captured when it is below 30 degree.

 

. . . . . . .Date: Mon, 20 Oct 2003 00:27:01 +0800

Subject: 20031018 Jupiter - bad quality! :-)

 

Dear friends,

 

Here was my first Jupiter image of 2003-2004 apparition captured in this morning. Bad quality, right?

 

Jupiter was around 25 degree from horizon. Seeing and transparency were bad. However, on the image, you still can see NEB and SEB. You can also see SEB disturbance is at the preceding side. Some festoon and projection are visible on EZ. BTW, a faint belt is visible to the north of NEB, would it be the NTB coming back?

 

Kind Regards,

 

 

. . . . . . .Date: Mon, 20 Oct 2003 00:36:02 +0800

Subject: Re: 20031018 Jupiter - bad quality! :-)

 

oops, sorry, here is the link:

 

http://www.ort.cuhk.edu.hk/ericng/Jup-2003010182130UT-eric.jpg

 

. . . . . . .Date: Sun, 19 Oct 2003 23:51:17 +0100

From: "Damian Peach" <dpeach_78@yahoo.co.uk>

Subject: Re: 20031018 Jupiter - bad quality! :-)

 

Hi Eric,

 

An excellent first image!.

 

>>Jupiter was around 25 degree from horizon. Seeing and transparency were bad. However, on the image, you still can see NEB and SEB. You can also see SEB disturbance is at the preceding side.

 

 

Its now looking very likely that a mid-SEB outbreak of white spots occured during Solar conjunction (look at the Jupiter guide at my website to see more info on this type of activity.)

 

The last such mid-SEB outbreak occurred in 1998, and was a spectacular sight visually.

 

 

>>Some festoon and projection are visible on EZ. BTW, a faint belt is visible to the north of NEB, would it be the NTB coming back?

 

 

This is not the NTB, but the North Tropical Band. Compare with images from last apparition to confirm the NTB latitude, and youll see its latitude is notably further North.

 

Also you captured Oval BA on the CM on your image (L2=213) and white spot Z/barge 1 on the NEBn. Also note the vague white spot in the SSTB directly south of BA.

 

A very interesting first image ;-).

 

Best Wishes,

 

Damian

 

. . . . . . .Date: Tue, 21 Oct 2003 12:38:38 +0800

Subject: 20031020 Jupiter

 

Dear friends,

 

Attached was the Jupiter captured in this morning. Very hazy sky! However I was quite satisfied with the detail shown on this image as it was taken when Jupiter at 30 degree from horizon.

 

http://www.ort.cuhk.edu.hk/ericng/jup-200310202158-eric.jpg

 

You can see very active equatorial zone with projections, festoons connection. There is a dark patch feature can be found on south tropical zone.

 

Wish you like it.

 

. . . . . . Date: Tue, 21 Oct 2003 11:36:20 +0100 (BST)

From: "J.H. Rogers" <jhr11@hermes.cam.ac.uk>

Subject: Re: 20031020 Jupiter

 

Dear Eric,

 

Thank you for that beautiful image; it is certainly the best image yet of the mid-SEB outbreak. The 'South tropical' dark spot actually appears to be in South Temperate latitudes, similar to STB Dark Spot 1 in 1998 (which lasted until 2000). NEBn white spot Z is also well shown, on the f.side.

 

All best wishes,

 

John

 

 

. . . . . . .Date: Wed, 22 Oct 2003 09:19:37 +0800

Subject: Re: 20031020 Jupiter

 

Dear John,

 

Thank you very much for your kind description and pointed out my misinterpretation of the dark spot location. I should be more careful next time. I have taken the Jupiter shot again in this morning, I shall post it later on.

 

Cheers,

 

 

. . . . . . .Date: Wed, 22 Oct 2003 12:43:08 +0800

Subject: 20032021 Saturn

 

Dear friends,

 

Attached was the saturn image captured in this morning, seeing was around 5/10 and transparency was very low ... Encke division was still not visible but you can see the very distinct dark "spot" like south polar region.

 

http://www.ort.cuhk.edu.hk/ericng/sat-20031021-2045UT-eric.jpg

 

Kind Regards,

 

. . . . . . .Date: Wed, 22 Oct 2003 12:46:37 +0800

Subject: 20031021 Jupiter

 

Dear friends,

 

Here was the Jupiter image captured in this morning, seeing and transparency were bad as it was still low on the sky.

 

http://www.ort.cuhk.edu.hk/ericng/jup-200310212204UT-eric.jpg

 

You can see the Io on the image as well. Colour fringe surrounding Io was caused by atmospheric dispersion.

 

Cheers,

 

. . . . . . . Date: Thu, 23 Oct 2003 12:37:21 +0800

Subject: 20031021 Jupiter - I am really confused ...

 

Dear friends,

 

I have just processed the Jupiter image captured in this morning after read the message by Frank concerning about the dark spot feature. Sorry that the exact UT time is not available now as I forgot to get back my observing log book. The should be around 22:10UT.

 

I checked the SKY software and there was double transit occurred at that time. According to the software, the bright spot at the preceding side was Io and the Ganymede should be near central meridian above NEB ... However, I could not differentiate whether the "dark spot" near the CM on my image was Ganymede itself or the dark feature in NEB mentioned by Frank. I am really confused ... The dark condensation on STemp region at following side could be seen on this image too.

 

http://www.ort.cuhk.edu.hk/ericng/jup-2003102222xxUT-eric.jpg

 

May the experienced observers and experts kindly commented on it?

 

Seeing was really bad as transparency was low as usual and the cloud formed on eastern sky near sunrise this morning, I could only capture it through the cloud gap ...

 

Thanks for your help

 

P.S. I shall post the exact time to here once I check my log book.

 

. . . . . . .Date: Thu, 23 Oct 2003 01:39:23 EDT

From: FrankJ12@aol.com

Subject: Re: [ALPO_Jupiter] 20031021 Jupiter - I am really confused ...

 

Eric-

 

My local astronomy club (Astronomical Society of Long Island) brought me this attention. The images of Jupiter Oct. 19th at 4:59 UT and 5:32 UT were taken by Olivier Meeckers of Belgium. It looked real and quite blurry. I didn't think it was shadow of a satellite. It could be the base of a large festoon or a hole in the clouds. So I brought this attention to follow it up. Your image shows a shadow of a satellite too far north where this huge spot was seen. Some imagers might want to back-track your photos for the past week.

 

Like you said, I would leave up to the experts.

 

Thanks Eric for a spectacular image!

 

Frank J M

 

. . . . . . . Date: Thu, 23 Oct 2003 02:22:34 EDT

From: FrankJ12@aol.com

Subject: Updated: Re: [ALPO_Jupiter] 20031021 Jupiter - I am really confused ...

 

Eric and all -

 

That black spot you have imaged of Oct. 22nd at 22:10 UT near CM is not a satellite's shadow. It is Ganymede itself!!! There is a big difference in albedo variations between the two satellites on the disk!!! Wow!!!

 

If you look carefully by Io, you can see the dark blue festoon. Perhaps, it is nearly the same location where this huge dark feature that was spotted at Sys I longitude 284 degrees on Oct. 19th at 4:58 UT which was imaged by Olivier Meeckers of Belgium.

 

Frank J M

 

 

. . . . . . .Date: Thu, 23 Oct 2003 18:35:45 +0800

Subject: Re: Updated: Re: [ALPO_Jupiter] 20031021 Jupiter - I am really confused ...

 

Thank you very much for the prompt comment by Frank and Antonio Cidadao. wow. I really could not imagine that Ganymede could be so dark on compare with Jupiter atmosphere. A good lesson!!!

 

Cheers,

 

. . . . . . . Date: Thu, 23 Oct 2003 18:37:16 +0800

Subject: 20031022 Saturn

 

Dear friends,

 

Last night the seeing was steadier but the transparency was terribly low ... Attached was the image captured on 20031022 at 21:29UT, hope the transparency will improve tonight ... Encke division was bearly visible on this shot

 

http://www.ort.cuhk.edu.hk/ericng/saturn-200310222129UT-eric.jpg

 

Kind Regards,

 


Eric NG (Hong Kong)

ericng@cuhk.edu.hk


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