From Silvia KOWOLLIK
®. . . . . . Subject: Re: Mars Image and a new one...
I was very surprised, when André asked me to forward this picture, because I am not really a
Planetary Observer like him. Normally I work with public guiding on our Teleskopes on Swabian Observatory
I have several Problems:
- I must mount my Webcam each night new, so the orientation is not exactly the same on my pictures...
- If there are thin clouds or fog (not to see with naked eye), the colorjustage is not ok, and then the pictures are too yellow...
- It is very hard to put a "sharp" picture, because the original single pictures are very dark and I have to take about 600 pictures/min with my webcam and add them with Giotto to see a good quality result (adding takes about 10 min). And I only have a time window of about 60 min to take pictures, then if the sky is deep blue and I cannot take any more pictures... So I can try maximum 5x the right sharp point...
> Here in
> the rainy season has begun from around 9 June and continues up
> until the end of July.
We don’t have a rainy season, but during the last days we had some hard thunderstorms and 3!!! tornados and I went "blind" to the observatory in hope, that the sky will become clear. And I was lucky. Here is the next picture, taken on 16th June, 2:33 UT
®. . . . . .Dear Masatsugu,
> Thank you for your second image which I received this morning. You
> are very welcome to our CMO, and the second image is also nice. I
> shall soon send it to Murakami who is in charge of the CMO Mars
> Gallery to be uploaded within this morning.
I am very surprised/proud, that my pictures are welcome - this is the first time that I observe with a group... I will send as much pictures, as I can take...
> Sorry we are using our jargons, but lambda implies the Martian
> season counted by the areocentric longitude of the Sun (Ls), and
> omega does the longitude of the central meridian, while fai is the
> latitude of the central point (S implying that the tilt of the
> south pole tilts toward us). The delta denotes the apparent
> diameter, and iota does the phase angle which suggests how far the
> line is deviated from the central meridian.
> I think you can find a necessary ephemeris in
I think, I need some assistance for the next 1 or 2 pictures, and then I can do it alone... The picture was taken at on Monday, 17th June. So:
omega=299,27 deg ?
fai=20,98 deg S ?
delta=14,49 arcsec ?
> I already made an access to the Web-Site of the Schwaebische
> Sternwarte, and it appeared to me as a good place to observe, and I
> am sure you will make rapid progress if you will continue.
I try to do it continuously, but it is hard to stand up 5 hours earlier than normal...
I take bitmaps with the programme "Giotto",
there I can take 600 Pictures each Minute with an exposure time of 1/25 sec. With good Seeing I take 1200 Pictures and stack them with "Giotto", then correct the blue and red channel (atmospheric refraction), then change contrast, sharpening, then correct color balance (depending on chip temperature/dust/thin clouds/moonlight...).
Stacking takes the longest Part - about 12 minutes with 1200 pictures, the rest is about 3 or 4 minutes "try and error", because not every function has a "wysiwyg"... but I got more and more experience, and so now I have some good "Housenumbers" for the filter functions...
"Registack", "Astrocap" and also "Astrostack" are not as good as I want: "Giotto" has more functions, works faster, and I knew the Guy, who programmed it... So I can tell him my wishes for the next version or tell him bugs...
PS: May I ask you, are you male or female? I am female, the only active Webcam observer in Stuttgart...
®. . . . . .Subject: Re: Mars Image and a new one...
> I don't know about the so-called Mars Previewer, but though some use
> it, it looks no good. Ours depends on the Astronomical Almanac
ok, I will look for the Almanac...
> Next I should advise you that no details of decimals are necessary,
> because 0.5 of the season does not mean anything...
ok I understand...
> Another point: If the observable time becomes longer, you may
> produce a series of images one night. In that case, take images
> every 40 minutes,
ok, I understood. I think, in 10 days I can start taking 2 pictures in a 40 minute span, then Mars will be higher over horizon, the observing time is longer and I can start earlier...
> ...In this way we can collect different day surfaces showing the
> same LCM (omega) to compare. Do you understand?
Giotto is a free programme, but there is neither a German nor English helptext available. So I made a "small" helptext in German on my homepage,
but my (written) English is not good enough for a translation. Sorry.
®. . . . . .Subject: Re: Mars Image and a new one...
> (If you become accustomed, you may take every 20 minutes on a fixed
> time schedule as some others do. In that way, you can obtain two
> sets of series since zwei times 20 minutes =40 minutes.)
I think, that will be possible...
I suppose you will be able start around at
> when Mars is nearly at opposition. The time implies
> here in the morning here, and so it will be the time
> we shall end the observation.
That’s my situation now. is here in the Morning and sky becomes blue...
Are there more observers from
> We shall put in our Favourite Links a linkage to your Web. Is it
to my private site? thats ok. You may also put a link to the site of the Swabian observatory, where I take the pictures:
> I saw three cats + alfa in your web. My family consists also of
> three cats + three including me.
I love cats. They have their own head. They just do, what they want...
Tonight we had clouds, so I could not take a picture...
®. . . . . .Subject: new Mars Image 21.6. 2:10 GMT
between Clouds I could take this picture - not very sharp, Seeing was very bad... Are you also interested in such bad pictures?
®. . . . . .Subject: Re: new Mars Image 21.6.
> Thank you for your contribution. It's OK, maybe just be
> made slightly less dark.
I was lucky, to get the picture - it was in a very small "free" part of the sky - we had a lot of clouds. And I think, there were some very thin clouds, not seen by naked eye...
I will continue and hope on better weather conditions...
®. . . . . .Subject: new Mars Image 22.6. 2:20 GMT
> I thought the first one was too dark and the second too bright, and
so I have just made another to show a light area of
> explicit. Attached find please the one made by me and I hope you
> don't mind if I send this to CMO-Murakami to upload (who is in charge
> of the CMO Mars Gallery).
Yesterday I could take a new picture of mars (at ). Tonight however it was not possible...
lambda = 208 Ls
omega = 257 deg
fai = 21 deg S
delta = 15,2"
iota = 40
is this correct? I think, I understand it now...