From Christophe PELLIER
® . . . . . . . . .Date: Sun, 29 Feb 2004 15:58:02 +0100
Subject: Jupiter, february 28th -29th
2004
Hi all
These images are the "return" of the 7" newtonian - I was tired of the
low-contrast images given by the C14. Seeing was quite good. The
With a shorter focal length, an UV image can be recorded
with this little instrument (4 mn - 180 x 0,5 sec.)
Best wishes
® . . . . . . . . .Date: Mon, 1 Mar 2004 21:19:56 +0100
Subject: Jupiter, march 1st 2004
Here are some
images from last night - fair conditions only. Note that the big bluish region
in SEBn/EZs is coming into view on the following limb
(IR images).
Best wishes
PS I'm still
getting some images on my last e-mail - please be certain that you use my new
email address
® . . . . . . . . .Date: Tue, 2 Mar 2004 23:04:24 +0100
Subject: Jupiter, march 2nd 2004
Hi everyone : last night seeing
was good. I have split the data into three sets because there were many images.
Best wishes
® . . . . . . . . .Date: Sun, 7 Mar 2004 17:27:14 +0100
Subject: Jupiter, march 6th-7th 2004
Hi all
Last night, good seeing
degrading with the time. As a curiosity,
I have made an image at 1 micron wavelength - I have recently purchased an IR
1000 filter to image Venus, but I tried it also on Jupiter. There is a methan band at 1000 nm and the image does seems to behave
more or less as a methan one :
EZ and GRS are a bit bright, while the SEB and
Best wishes
® . . . . . . . . .Date: Tue, 9 Mar 2004 20:46:20 +0100
Subject: Venus march 1st
and 8th
Hello :
Two more set of Venus images - poor seeing on march 1st but good on the 8th. In the UV images
of march 8th, note the famous "psi" feature near the venusian
limb. I have tested the IR 1000 filter on Venus for first time (exposure 1/33th (UV 1/50th)), but the result look disappointing. The
three IR images do seem to show the same details (of incredibly weak contrast),
like for example a dark patch to the left of the center with a white spot over
it, but the IR 1000 apparently brought no improvement in terms of contrast.
Best wishes
® . . . . . . . . .Date: Wed, 10 Mar 2004 18:47:39 +0100
Subject: Re: Venus march 1st
and 8th
Frank, yes it's clear that IR is less interesting for Venus -
however Galileo imaged some details in near IR when it passed Venus - I'm not
talking about its thermal IR images. However the precise wavelength is not
indicated on the images, and I don't know if it's before 1 micron or
after...
For the CH4 filter, it should behave for Venus exactly
as any near IR filter!!
® . . . . . . . . . Date: Wed, 10 Mar 2004 19:07:45 +0100
From: "Christophe Pellier"
To: "JULIUS
BENTON"
Subject: UV imaging for SCTs
Hello Julius and all,
After the very first UV images I have made with the C14
of my club, several osbervers did not believe it was
UV because of the correcting plate. They were thinking about an IR leakage
instead. However I think that near UV images is definitely possible with an
SCT, I have tested this on Venus, Jupiter, Saturn and Mars and it was
relatively easy. Also see Antonio's past UV images of Jupiter with his former
10" and Damian recent UV images with his C9.25. Surely some light is
absorbed, but not enough to make this kind of observation uninteresting with an
instrument with a correcting plate...
Possibly, the UV absorption by glass is strong only
before 350 nm, but anyway due to the very low CCD response before this wavelength
the majority of the recorded UV belongs to the band 350-400 nm and there is no
problem.
Regards
----- Original
Message -----
From: "JULIUS BENTON" <jlbaina@msn.com>
Sent: Wednesday, March 10, 2004 12:40 PM
Subject: RE: Venus, March 8, 2004
> Thanks, Tom,
for your images.
>
> I am doing some
studies now to determine just how much UV transmission
> occurs through
corrector plates of SCTs, etc. Several observers have
asked
> about this, and it would be interesting to know more.
>
> Regards,
>
> Julius L. Benton, Jr., Ph.D.
> Coordinator
> Saturn, Venus,
& Lunar (SAP) Sections
> ASSOCIATION OF
LUNAR AND PLANETARY OBSERVERS
® . . . . . . . . .Date: Wed, 10 Mar 2004 18:38:41 +0100
Subject: Re: Venus march 1st
and 8th
Paolo, here is the "Psi" : Hope you can read it in the message. Together with
Y-shaped feature, this shape is one of the first recognized in UV images of
Venus.
Frank, no image today nor tomorrow nor...
Subject: Jupiter, march 9th 2004
Hi all
Seeing mostly fair,
variable.
Best wishes
® . . . . . . . . .Date: Wed, 17 Mar 2004 21:32:41 +0100
Subject: Jupiter, march 13th,
and 16-17th
2004
Hi everyone
The first image has been taken with the CN212 of a friend
(the same that already allowed me to use this instrument on Mars in 2003 august),
during a regional star party. The seeing was poor but the arrival of a big
cloud improved the seeing at the very last minute (300 frames exactly !).
On the 16th-17th, there have been a
good moment in an otherwise fair night.
Regards
® . . . . . . . . .Date: Fri, 19 Mar 2004 10:50:06 +0100
Subject: Venus march 16th
and an animation
Hi all
I managed to have time to observe Venus in a full aftern
Best wishes
® . . . . . . . . .Date: Sat, 20 Mar 2004 00:01:08 +0100
Subject: Re: Venus march 16th
and an animation
Thanks Frank
It would be nice to do the same job with a different
pattern of details...
That one on march 16th was not the most
spectacular I have seen !
Regards
Christophe PELLIER (Bruz,
Coordinateur
Section Mars et planètes telluriques de la SAF