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My first Jupiter in 2019

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#26 Sasa

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Posted 22 July 2019 - 02:53 AM

Thanks Michael. Indeed, it looks like I got short glimpse of Oval BM. There is new image on ALPO Japan from the same day at about the position.

 

http://alpo-j.asahik...9/j190721a1.jpg

 

Oval was there preceding the darker patch in STB that I draw (I never check Jupiter rotation prior the observation to avoid potential bias). I hope, I will have better conditions next time. I will also need to increase my persistence (or self-confidence...).


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#27 Sasa

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Posted 24 July 2019 - 01:35 AM

I had a chance yesterday to observe Jupiter through something bigger than ma small refractors. My friend visited me yesterday, he brought his excellent Newton 200/1200 with quartz mirror. This was definitely a step in resolution from my 82mm refractor which I set up next to it.

 

Here is a quick rough sketch, just main features. It is hard to concentrate when you talk and walk during observation and sketching. Jupiter was almost in the same rotation as last time, white oval was just rising (according to WinJupos). I did not see it

 

Jupiter_20190723_1940UT.jpg


Edited by Sasa, 24 July 2019 - 03:01 AM.

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#28 Asbytec

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Posted 24 July 2019 - 02:18 AM

Sasa, nice rough sketch, plenty to see. I find it difficult to just get started on a sketch, dunno where to start or how much to include. Besides, still getting to know my 200/1200 Dob and kind of clumsy at the controls. Hard to settle in and focus.

Nice job. Hope to join the fun soon enough.

#29 Sasa

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Posted 24 July 2019 - 03:01 AM

Yes, pushing the Dobson during sketching was not that comfortable. The Newton had special primary quartz mirror with excellent optics. Secondary was from Protostar that I originally bought to improve my former 250/1600 Newton. OTA was put on GSO dobson base and it was clumsy as well. That's why I was sketching at low power and with Paracorr. This was OK. Later, when we tried to split zeta Her near zenith, I was not able to track it at 240x due to short pushing arm.

 

The guy has also regular 150/1200 Skywatcher Newton. He prices the optics quite a lot. I should get it on loan in autumn. Definitely looking forward to new experience.


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#30 Sasa

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Posted 25 July 2019 - 01:26 AM

I was thinking of setting up my larger refractor yesterday. At the end I was glad that I pick up just the small 60mm refractor. Seeing was quite bad

 

Jupiter_20190724_1953UT.jpg


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#31 rerun

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Posted 25 July 2019 - 11:32 AM

Alexander,

 

Great sketch of Jupiter especially for bad seeing. Fine details in the NEB and SEB .Here it was to hot for observing yesterday.Today we had 40 degrees celsius . I hope for lower temperatures at the weekend. 

 

Clear skies Markus 



#32 Sasa

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Posted 25 July 2019 - 03:20 PM

Tonight I set up my larger refractor (82mm) but the seeing was even worse than yesterday. I prepared 12.5mm eyepiece, but at the end I went home for 16mm one. This one is monocentric eyepiece and as my lens is oil doublet and I was observing with straight tube, I was at least enjoying observation through optical apparatus with just 4 air-to-glass surfaces (not that it mattered that much tonight).

 

I had a feeling from the look of STB that GRS must be somewhere at the western edge, or just behind. As I checked now in WinJUPOS, this was indeed the case. Yet, I did not see a slightest hint of GRS

 

Jupiter_20190725_1937UT.jpg


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#33 niteskystargazer

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Posted 26 July 2019 - 01:59 PM

 Alexander,

 

Nice sketch !!!!! smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#34 Sasa

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Posted 26 July 2019 - 03:44 PM

Thanks Tom. Here is a fresh one from tonight, again very bad seeing

 

Jupiter_20190726_1958UT.jpg


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#35 rerun

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Posted 28 July 2019 - 03:55 AM

Alexander,

 

another great sketch of Jupiter. Here we had not seeing. So I like your sketch about bad seeing very much.

 

Clear skies Markus 



#36 frank5817

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Posted 28 July 2019 - 11:54 AM

Alexander,

 

I think you have added 16 more fine Jupiter sketches since I last commented.

I am enjoying all of them.

 

Frank :)



#37 Sasa

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Posted 28 July 2019 - 04:27 PM

Alexander,

 

I think you have added 16 more fine Jupiter sketches since I last commented.

I am enjoying all of them.

 

Frank smile.gif

Thanks Markus and Frank. Yes, for me sketching Jupiter is favorable pass time. I sketch Jupiter every possible evening if I'm at home.

 

BTW, an image from similar rotation as in my last sketch appeared on ALPO Japan

 

http://alpo-j.asahik...9/j190726c1.png

 

Oval BA in STB was again near meridian. I was able to glimpse it very shortly despite the bad seeing and I found a courage to draw it faintly. It seems that I got the position right even I was not 100% convinced at the eyepiece that I saw the oval.


Edited by Sasa, 28 July 2019 - 04:28 PM.

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#38 frank5817

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Posted 28 July 2019 - 06:12 PM

Alexander,

 

"BTW, an image from similar rotation as in my last sketch appeared on ALPO Japan"

 

Indeed, they match very well.

 

Frank :)



#39 pisceskidd

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Posted 29 July 2019 - 03:58 AM

Impressive sketch! 



#40 Sasa

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Posted 01 August 2019 - 03:14 PM

FOA-60 is so small that I could easily pack it for vacation in my parents house. Tonight I run on GRS after almost one month. It was tiny (well almost anything is tiny on Jupiter at power of 104x), yet quite dark. This made GRS to be a quite prominent feature.

 

Jupiter_20190801_1926UT.jpg


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#41 Warmvet

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Posted 04 August 2019 - 12:52 PM

Alexander, its wonderful to watch the progression of changes from your hand. I also like the monochrome effect, seems to pull out more distinct details.

 

Cindy



#42 Sasa

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Posted 04 August 2019 - 04:29 PM

Thanks Cindy. I'm not good with colors, monochromatic version is a must in my case, not an intention.

Also, these are rough sketches made directly at the eyepiece. I can't imagine myself dealing with color pencil at the eyepiece. I cannot manage them during daytime...

 

I was out tonight again. I was observing Jupiter mostly through clouds. That's why I stayed at 111x. Jupiter was most of the time quite dark even at this relatively low power. In any case, it was worth the effort as I was rewarded by Ganymede emerging behind Jupiter. I estimated that the last contact was around 19:29UT. Yet, according to WinJUPOS, the moon was still half hidden behind Jupiter. I don't think my mobile phone time is so off (it agrees with my computer time, and I believe, both are tuned over internet). Do you have an explanation for this?

 

Jupiter_20190804_1925UT.jpg


Edited by Sasa, 04 August 2019 - 04:30 PM.

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#43 Sasa

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Posted 06 August 2019 - 06:42 AM

Thanks to a fellow,  which was imaging Jupiter at the same time as my last sketch, I think I understand the time difference. Indeed, Ganymede was around 19:28UT still half buried in the shade. However, not behind the planet. There was tiny black line (Jupiter shade) separating the moon from the disc. Thanks to low angular resolution of 82mm lens, I was perceiving Ganymede as rounded (probably it was not completely rounded, but I was not paying special attention to it). Comparing my sketch with the image, I was quite pleased that the result of my work is not that far from what was actually happening on Jupiter:

 

cmp_Jupiter_20190804_1925UT.jpg


Edited by Sasa, 06 August 2019 - 06:43 AM.

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#44 Sasa

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Posted 08 August 2019 - 03:17 PM

Tonight, GRS was near meridian and nicely visible, I could even glimpse its strong orange color from time to time

 

Jupiter_20190808_1908UT.jpg


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#45 Sasa

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Posted 09 August 2019 - 03:13 PM

Not every night could be perfect. I had only about one minute of reasonable view in those 20 minutes that took me to make this sketch. The rest of the time, Jupiter was too dim or invisible due to clouds. Still, I was able to glimpse few details

 

Jupiter_20190809_1900UT.jpg


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#46 azure1961p

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Posted 10 August 2019 - 10:53 AM

Thanks to a fellow,  which was imaging Jupiter at the same time as my last sketch, I think I understand the time difference. Indeed, Ganymede was around 19:28UT still half buried in the shade. However, not behind the planet. There was tiny black line (Jupiter shade) separating the moon from the disc. Thanks to low angular resolution of 82mm lens, I was perceiving Ganymede as rounded (probably it was not completely rounded, but I was not paying special attention to it). Comparing my sketch with the image, I was quite pleased that the result of my work is not that far from what was actually happening on Jupiter:

 

cmp_Jupiter_20190804_1925UT.jpg

One if my favs in this line up, especially what you show in the northern regions. Challenging in the photo but clear in your drawing. Terrific.

 

Pete


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#47 Sasa

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Posted 11 August 2019 - 04:12 PM

Thanks Pete, yes, I was too quite surprised by the level of agreement between my sketch and the image. Especially because I was using relatively low power.

 

Here is another sketch. This time from our vacation location (FOA60 is so small that I can take it almost everyhwere). Seeing was again bad, at least the atmosphere transparency was pretty good and Jupiter was showing nice colors. Not only Jupiter, later on, when we were trying to spot with our kids Persied showers, the colors of stars were much vivid than from our backyard. We were lucky, all of us, including the kids, saw one nice long and bright Persied with short afterglow. It was orange!

 

Jupiter_20190811_1852UT.jpg


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#48 Sasa

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Posted 18 August 2019 - 03:53 PM

Tonight, I managed to observe and sketch Jupiter in early twilight, just after I was able to locate it with naked eyes. I was in a hurry, cold front was already approaching. South was still very clean with very good transparency. I was rewarded by nice colors. GRS was just passing the meridian and equatorial region was quite busy tonight:

 

Jupiter_20190818_1818UT.jpg

 

As there was still more time, I decided to sketch Saturn as well. I had no template, so it was mostly an exercise in drawing ellipses in dark. I was not able to observe anything beyond what I already saw in previous apparitions. In particular, well defined Cassini for most of the ring, shade of the ring over the planet, Saturn shade on rings. On the globe, I was able to see clearly only NEB (south edge was better defined, the north edge was very low contrast feature) + darkening at north pole:

 

th_Saturn_20190818_1902UT.jpg


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#49 frank5817

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Posted 19 August 2019 - 10:34 AM

Most recent sketch of Jupiter showing great detail. Saturn sketch is a good one too.

I keep an eraser nearby to draw Saturn. It is always an exercise of drawing re-drawing and much erasing.

It is more difficult than drawing a human face.

 

 

Frank :)


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#50 Sasa

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Posted 19 August 2019 - 04:55 PM

Most recent sketch of Jupiter showing great detail. Saturn sketch is a good one too.

I keep an eraser nearby to draw Saturn. It is always an exercise of drawing re-drawing and much erasing.

It is more difficult than drawing a human face.

 

 

Frank smile.gif

Very true. I wished several times I took an eraser with me. In particular, I screwed up the ring shadow on planet globe. After 30 minutes of sketching, I also run out of patience while trying to make a dark and uniform background around Saturn just with one pencil (B).




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