LtE in CMO #247

From António José CIDADÃO


@. . . . . . Finally..., here are a few Mars images (9 June, 16 June, 17 June, 28 June, 4 July, 6 July -Ed).

Right: ACd's images on 9 June 2001
25cm SCT/ST-5C

 

Unfortunately, I'm afraid that my contribution this apparition will not be what I had planned :-(I have been very very busy with work these last few months, and if you add the current positioning of Mars at Lisbon latitude, and the unfavorable summer seeing conditions, you can anticipate what I mean.

 

 Mars is behind one of my "beloved" chimneys at culmination, and before that it is hidden by the roof. Even when it reappears, most of the time I can only use part of the telescope's aperture, also due to the roof.

 

 Unfortunately, it is not only light that is lost... It is nearly impossible to produce the correct flat-field images, because the Mars raw images often contain "partial dust doughnuts". I had noticed this earlier in the first May images. Please keep this in mind when analyzing the images, OK. As Maurizio had already mentioned, the IR filter is very valuable under these unfavorable conditions. On some occasions, the UV filter produces better (contrast) images than the B filter, although 30s integrations are needed.

 

 In short..., it was only yesterday that I could work on the few images obtained during June and the first days of July. They are not yet in my page, and I haven't send them to Marswatch either.

 

 Hellas seems to continue bright in R and IR (not so in B or UV), but Syrtis Major now appears to be darker than earlier during the storm.

 

 By the way, I had some blocking incoming e-mail messages during late June (around last week of June I guess) and I had no option but to delete all the mail at the server. If any of you send me some data during that period can you send it again, please.

 

 Regards, and good observations to all!

(8 July 2001 email)


António José CIDADÃO (Oeiras, Portugal)

a.cidadao@mail.telepac.pt


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