LtE in CMO #280

From Johan WARELL


 

. . . . . . . . Date: Thu, 02 Oct 2003 19:44:10 -0400

Subject: Mars Sep. 26, 27, 28, 30, Oct. 2

 

 

Dear Dan, Masami and Richard,

 

I'm sending you here a new set of Mars observations, mainly with the ToUCam.

 

I believe I have now figured out the cause of the strange regular features seen in some of the previous Mars images. Probably they are due to an insufficient number of color levels that are possible to shuffle from the camera to disk at 15 frames per second, which is the rate I have been using. Acquiring data at a minimal 5 fps has so far removed this effect, I will stick to this in the future. It means the AVI files have to be longer in time to get the same number of sharp images, but the result is better as far as color depth is concerned.

 

The images and drawings will be sent in separate mails.

 

Best wishes,

 

. . . . . . . .Date: Sun, 05 Oct 2003 13:36:39 -0400

Subject: Mars Sep 30 (RESEND), Oct 3, 4, 5

 

Dear friends,

 

A new batch of Mars images from the past three nights, seeing has improved a little as the daytime temperature is gradually decreasing.

 

In the morning hemisphere, Calydon-Phoenicis Lacus with small Noctis Lacus in between is interesting as it has been less blue than the surrounding dark albedo features, making it appear redder. The arc is prominent in blue images as a dark L-shaped feature. The effect seems to be reduced near the CM.

 

I am also resending the Sep 30 image as the title date was incorrect.

 

Best wishes,

 

. . . . . . . .Date: Sun, 05 Oct 2003 13:51:08 -0400

Subject: Mars Sep 26, 27, 28, Oct 2 RESEND

 

Dear Masami,

 

I do not see some of my Mars images and drawings on the CMO web page that I sent you previously, so I am resending them here.

 

All the best,

 

. . . . . . . .Date: Tue, 07 Oct 2003 03:24:11 -0400

Subject: Mars Oct 6

 

Hi,

 

Sending you an image from last night Oct 6. An extended morning cloud over Solis Lacus and surrounding light deserts to the north of Chryse is apparent, unlike the night before. The extent is much like the case on Aug 31, Sep 2, 3, as the cloud was similarly absent on Aug 30 (as indicated by my image data only). The image also indicates that Calydon-Phoenicis Lacus is still very dark in blue at the extreme limb under the morning cloud.

 

The image follows in the next mail.

 

Best wishes,

 

. . . . . . . .Date: Tue, 07 Oct 2003 03:24:21 -0400

Subject: Mars Oct 6 (image)

 


Johan WARELL (Lunar and Planetary Laboratory, Tucson, Arizona, USA)

jwarell@lpl.arizona.edu

johanstina@netscape.net


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