From Christophe PELLIER
@ . . . . . . . . . .
Date:
From: "Christophe Pellier"
<chrispellier@infonie.fr>
To: <vzv03210@nifty.com>, <
Subject: My contributions to CMO / OAA
Hello Masami Murakami and
Masatsugu Minami,
I send you my first contribution
to the CMO work. I have been a regular reader of the OAA/CMO web site for a few
years, and now I would like to participate to this wonderful work. I would like
to apologize for the low quality of this first image, but I live in
I hope to send you better images as the
apparition goes on.
Best regards,
@ . . . . . . . . . .Dear all, here is my first Mars image of the current apparition. It has been taken under very poor
conditions as the planet is still low above the horizon,
nonetheless it counts for an "observational report". A drastic
selection of 170 frames among 1400+ (3 mn avi file) and a red filter have permitted to reveal a dark Syrtis Major, Sinus
Sabaeus, and even Hellespontus. The SPR displays too
white patches, but this is likely to be an artifact. Best regards
(
@ . . . . . . . . . .Date:
Subject:My contributions to CMO
/ OAA
Dear Masatsugu,
thanks for your message. Yes, it's important for Mars that
observers are situated all around the world, and I will try to observe the
planet as much as I can. I remember that some information may have been lost in
2001 because
My current location is situated at
48ﾟ01'N latitude and 001ﾟ44'Ｗ longitude. I would feel honored to receive a paper copy of CMO !
About the blue images, I know it's
very important for Mars and I'll try to make some, but it may be very difficult
for me to do so, for many reasons. The most important being that I work with a
small diameter at a high F/D ratio, and the blue filter I have (W38A) absorbs
much light. This winter I tried to image Jupiter through color filters, and I
could never have an image bright enough with that filter. One average solution
could be to show the blue component of a color avi
file of the webcam, but it doesn't displays the corrects wavelengths, and with the planet low in the
sky, it's completely destroyed by atmospheric dispersion... In fact, for a
while, I'm afraid that the red filter (W25A) will be my only mean to have some
details in the images. Sometimes observing conditions require hard adaptations
from part of the observer...
Best wishes
@ . . . . . . . . . .Date: Thu,
Dear Masatsugu,
many thanks for sending me the next CMO issue. I will try to
obtain blue images. If so, it may be easier to make a color composite while the
results with color avi files are not good enough.
However, conditions must rapidly improve in may
because the planet will get higher and its diameter will increase rapidly. If
you have any information from Dr Okano, please let me know !
Best wishes
@ . . . . . . . . . .Sent:
Subject: Mars april 16 -
bright areas ?
Hello everyone, Here are a few
images taken this morning, again under very poor seeing, nonetheless they
reveal unexpected features as these bright areas visible on every image, with a
dark patch at the center. This looks like dust (bright in red) but this is quite puzzling in
this martian season, and I'm
not sure of what I see. The bright areas are yet visible on the raw frames so they mustn't be
processing artifacts. I was thinking about Syrtis Major encircled by simple
white clouds but it's a bit early to see it so "far" from the limb
and how can white clouds be visible in red ? I tried
also to get a blue image following Masatsugu's
advice, but as expected, it has been impossible to use the W38A filter (too dark) ; so I tried a light blue one with two W80A filters stacked
together. It's better than nothing but not good from a wavelengh
point of view. Any comments would be most welcomed about this set...
@ . . . . . . . . . .Subject: Mars
image, april 17
Seeing was even poorer this
morning, with very low transparency... The bright areas are still visible but
maybe they are merely brighter parts of the deserts. Some evening clouds are
visible. The RGB image can show you how bad are the current observing
conditions on Mars !
Best regards
(
Christophe PELLIER
(Bruz,
