LtE in CMO #277


. . . . . . . .Date: Tue, 19 Aug 2003 19:54:15 +0200

Subject: More and more with a 4" refractor


Dear friends,


Please look at a glance these interesting observations for a so small telescope.


August 6th : great seeing, slow waves, sharp images.

"M_030806_013828_DCr_WWs-.jpg" and "M_030806_015608_DCr_WWs-.jpg" (probably my best shot).

Details in Cyclopia (Gomer S.), North of Cimmerium M. White patch (orographic cloud) on Elysium. Yellowish northern hemisphere.


August 12th : fair seeing, clear sky.

"M_030812_014923_DCr_WWs-.jpg" and "M_030812_024549_DCr_WWs-.jpg".

Nix Olympica obvious and probably white patches (orographic clouds) on Arsia Mons and Pavonis Mons.


August 19th (this morning) : poor seeing, cloudy sky.

"M_030819_015112_DCr_WWs-.jpg". SPC complex (3+ fragments).

Juventae F. hardly displayed. White patch on Protei R. (?). NPH seems to retrieve (?).


Now compare "M_030801_021118_DCr_WWs-.jpg" taken with the 4" fluorite and Philips VestaPro webcam from my home by rather good conditions on August 1st, with "M_030802_022405_DCr_VWs-.jpg" (same CM), a very disappointing image taken with the 1 meter telescope (the 40" F/D=22 reflecting telescope, not the 33" "Grande Lunette" refracting telescope) at Meudon Observatory and tri-CCD 2/3" Digital Camera Recorder Sony DCR-VX2000E by fair conditions on August 2nd.


Baffling ! May be due to optical and/or thermal problems (since well collimated).


Best regards,


Daniel CRUSSAIRE (Champigny-sur-Marne, France)

Departement LESIA

Observatoire de Paris-Meudon

5, place Jules Janssen

92195 MEUDON Cedex

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