LtE in CMO #279

FromChristophe PELLIER

 


. . . . . . . .Date: Sat, 13 Sept 2003 16:12:17 +0200

Subject: Saturn on september 13 2003

 

Hi all

The night has been cloudy for Mars but the sky cleared at 04 H 30 and Saturn was well placed to be observed. There is again a white spot, near the CM, what do you think ? I see one possible spot, rotating with the planet on the three images (barely visible on the red image).

Best wishes

 

. . . . . . . Date: Mon, 15 Sept 2003 00:16:12 +0200

Subject: Mars, september 13 2003

 

Hi everyone

Finally the good seeing returned to my location last night. However some images have been misfocused, sorry !

 

http://astrosurf.com/pellier/2003-09-13-CPI

 

Regards

 

. . . . . . . Date: Mon, 15 Sept 2003 00:18:03 +0200

Subject: Saturn on september 14 2003

 

Hello observers. The observing conditions were excellent for these. No spot suspected here...

Regards

 

. . . . . . . Date: Tue, 16 Sept 2003 22:20:43 +0200

Subject: Mars, september 15 2003

 

Hi all. The conditions were good last night, and this time the images have been correctly focused :-)) I have managed to get some blue images through a W47 filter (deep blue) with IR-blocking. Although the filter is very difficult to use, it gave more contrast to the white clouds of the planet, with a better green-cutoff than the B Astronomik it seems. There are clouds now up to the martian noon on these. The link is

http://astrosurf.com/pellier/2003-09-15-CPI

Regards

 

. . . . . . . Date: Wed, 17 Sept 2003 02:06:47 +0200

Subject: Re: [marsobservers] Mars, september 15 2003

 

Well said Clay. And, as the planet will go away, it will also rapidly increase its altitude for the observers in the northern hemisphere, so the observing period is really not over at all. In 2001-2002 some imagers have taken very good images even 6-8 months after opposition !

 

----- Original Message -----

From: "P. Clay Sherrod" <drclay@arksky.org>

Sent: Wednesday, September 17, 2003 12:05 AM

Subject: Re: [marsobservers] Mars, september 15 2003

 

 

> Nice images Christophe...

> Our seeing conditions here have deteriorate horribly and the planetary image

> is such that focus is nearly impossible. Hopefully others will continue to

> monitor, but I am seeing a dramatic drop in the number of contributed

> observations and images just since last week. There are still at least

> three excellent weeks available for imaging and detailed observations and we

> need to get the word out worldwide that our observers should continue as

> long as possible.

> 

> Clay

 

 

. . . . . . . Date: Wed, 17 Sept 2003 20:55:17 +0200

Subject: Mars, september 16 2003

 

Hi all : good seeing with a light haze last night, which led me to make an AVI of 4 minutes for the W47 image... There is a strange white protrusion at the edge of the north polar hood. Am I wrong or the white clouds are more numerous than last month ?

 

http://astrosurf.com/pellier/2003-09-16-CPI

 

Best wishes

 

. . . . . . . Date: Wed, 17 Sept 2003 22:14:28 +0200

Subject: Saturn on september 17 2003

 

Hi everyone,

I have observed Saturn this morning under beautiful conditions. These images show the critical CM III = 200, and on the first four images, again maybe a very weak white patch is observed near the central meridian, but this is getting hard to detect, so it would be good to see some images taken with a bigger instrument. I can't conclude with these images.

Best regards

 

. . . . . . . Date: Thu, 18 Sept 2003 13:11:29 +0200

Subject: Re: 20030917 Saturn

 

Hi Eric : very impressive image, and the belt structure is indeed nicely shot. Hopefully you will catch the spot...

Best wishes

 

----- Original Message -----

From: "Eric Ng" <ericng@cuhk.edu.hk>

Sent: Thursday, September 18, 2003 7:30 AM

Subject: 20030917 Saturn

 

 

> Dear friends,

> 

> Attached was the saturn images taken in this morning. Saturn was around 50

> degree from horizon but the atmospheric dispersion is enough to blur some

> details on the ring (especially for Encke minima and Encke division).

> However, the belt structure on the globe is very beautifully shown. Wish you

> all like it.

> 

> http://www.ort.cuhk.edu.hk/ericng/saturn_200309172050_eric.jpg

> 

> Regards,

> 

> Eric

 

. . . . . . . Date: Thu, 18 Sept 2003 13:04:58 +0200

Subject: Re: Saturn on september 17 2003 - spot still present.

 

Hi Damian, very good idea that you had to composite some of the final images... It looks much more convincing now :)

Thank you

 

----- Original Message -----

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

Sent: Wednesday, September 17, 2003 11:23 PM

Subject: Saturn on september 17 2003 - spot still present.

 

Hi Christophe,

 

Thanks for the excellent Saturn images. Please see the attached image. I composited two of your images that are sufficiently close in time to avoid smearing caused by rotation. The improved S/N and strong sharpen brings out the low contrast details of the cloud belts. As you can see, the small spot remains, and moves with the rotation of the Planet.

 

As was noted last apparition, these spots are very low contrast features, and require excellent seeing to be captured clearly.

 

Here is the data i took from the images:

 

04:04.6 UT CM3=206.1 -40.4

04:08.8 UT CM3=202.8 -40.0

 

If anything, the spot at this very preliminary stage shows a slightly

retrograding drift, but its to early to provide accurate drifts of the

feature.

 

Keep up the excellent work!.

 

Best Wishes,

 

Damian

 

 

. . . . . . . Date: Fri, 19 Sept 2003 00:35:47 +0200

Subject: Mars, september 17 2003

 

Hi observers : here is my latest set of images taken under very good conditions.

 

http://astrosurf.com/pellier/2003-09-17-CPI

 

Best wishes,

 

. . . . . . . Date: Sun, 21 Sept 2003 19:10:00 +0200

Subject: Mars, september 19 and September 20 2003

 

Hi everyone

Here my too last sets of images before the rain. Good or fairly good conditions. There are very nice clouds in Tharsis !

http://astrosurf.com/pellier/2003-09-19-CPI

http://astrosurf.com/pellier/2003-09-20-CPI

 

Best wishes,

 

. . . . . . . Date: Wed, 24 Sept 2003 19:30:21 +0200

Subject: Mars, september 23 2003

 

Hi all, some Mars images taken under fair seeing but excellent transparency. I have been amazed by how much the turbulence was reduced when using an IRcut with the RG610 red filter instead of using the IR part as usual. I'm convinced that the use of somewhat narrow filters do have a positive influence on the seeing...

 

http://astrosurf.com/pellier/2003-09-23-CPI

 

Regards

 


Christophe PELLIER (Bruz, Ille-et-Vilaine, France)

chrispellier@tiscali.fr


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