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Venus, spring 2021

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#1 Quinnipiac Monster

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Posted 03 May 2021 - 04:21 PM

First observation of Venus for this elongation! As usual, I waited for the Sun to "set" behind my house to keep the telescope in the shade (and my eyes safe). This did not leave much time to observe since the angular separation was just 9.4 degrees, but seeing was horrible anyway. Very easy to find it in the viewfinder, in spite of the vicinity to the Sun and the small diameter (9.8").

 

The phase was 98.7%, yet the disk did not seem completely "full" and the defect was right where it should have been (right lower corner in the sketch). Some banding noticeable at 220x, particularly in full light and with a #80A. I did a quick sketch, just to give an idea of what it looked like. Still warming up smile.gif

Newton 10" f/7 from New Haven CT.

 

p.s. I hate thread proliferation, so I have decided to place all of my observations of Venus in this thread if the mods are fine with that.

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Edited by Quinnipiac Monster, 03 May 2021 - 04:25 PM.

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#2 flt158

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Posted 03 May 2021 - 05:14 PM

What a delightful sketch you have given us of Venus even before sunset, Quinnipiac Monster! applause.gif

 

I greatly admire those 2 subtle grey areas. 

 

By the way, I am not in the least bit surprised you had horrible seeing. rolleyes.gif  

 

But it is very nice to know the brightest and the closest planet is back in our evening skies! 

 

Clear skies from Aubrey. 


Edited by flt158, 03 May 2021 - 05:15 PM.


#3 guilaume

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Posted 03 May 2021 - 11:33 PM

Hi, it's very nice observation in bad conditions with very good sketch. 

Thank you.

Clear skies.



#4 chrisrnuttall

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Posted 04 May 2021 - 01:53 AM

You've made a good early start on Venus with the disc almost full. Nice to see it showing some detail in the bright blue sky in your drawing.

I have similar intentions but the weather in the daytime has taken a turn for the worse, the sky outside is grey and full of rain clouds as I write, but your drawing reminds me of this time a year ago getting sunburnt whilst making daily drawings in shorts and t-shirt, a price worth paying.....
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#5 Quinnipiac Monster

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Posted 04 May 2021 - 08:26 AM

It's either 1) clear but windy (as in, windy) or 2) rainy, or 3) both. Mostly 2 and 3. It's been like that for weeks, only reason why I had to give up on Mars. I caught that glimpse of Venus on a rare clear day, using the house as both a sun and wind shield.

 

I do not remember ever getting sunburnt observing Venus, but perhaps my (Italian) definition of a sunburn is different from Yorkshire's smile.gif

 

What a delightful sketch you have given us of Venus even before sunset, Quinnipiac Monster! applause.gif

 

I actually never observe Venus after sunset, but perhaps it's not a bad idea. Seeing may be better with Venus lower but the Sun down. I remember observing the 2004 transit of Venus on the Sun, soon after sunrise the seeing was perfect, at midday a total mess. That would be more complicated though, because I do not have a good western horizon so I will only be able to do it around the W elongation, or I will have to load the telescope on my car.


Edited by Quinnipiac Monster, 04 May 2021 - 08:28 AM.

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#6 niteskystargazer

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Posted 04 May 2021 - 08:37 AM

Ivano,

 

Nice sketch of Venus, (Spring 2021) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#7 chrisrnuttall

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Posted 04 May 2021 - 12:10 PM

I actually never observe Venus after sunset, but perhaps it's not a bad idea. Seeing may be better with Venus lower but the Sun down. I remember observing the 2004 transit of Venus on the Sun, soon after sunrise the seeing was perfect, at midday a total mess. That would be more complicated though, because I do not have a good western horizon so I will only be able to do it around the W elongation, or I will have to load the telescope on my car.

Midday / early afternoon seeing was horrible for me on Venus last year. Definitely better with the sun lower down.


 

I do not remember ever getting sunburnt observing Venus, but perhaps my (Italian) definition of a sunburn is different from Yorkshire's smile.gif

Probably! But also your Italian skin may well be more difficult to burn than mine!


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#8 chrisrnuttall

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Posted 08 May 2021 - 02:05 PM

Hi Ivano, hope you don't mind me adding my Venus sketch to your thread, I thought it made sense.

 

I managed a couple of observations of Venus on Friday during gaps between bands of raincloud.

The first was at about 14:00 when Venus was due south and 55° high, despite the altitude the seeing was pretty bad, I suppose because of all the thermal mixing happening with strong sun breaking through big rain clouds. All I managed to see was a blank disc with a softly shaded terminator to the following side.

Then it clouded over for the afternoon, but as the sun was sinking behind the house there was a 40 minute clearance in which I was able to get a decent view.

I observed in Integrated light for a few minutes before switching to my favourite filter for Venus in a bright blue sky, the 1000 Oak LP2, which is a bottle green and seems to really bring out detail.

Again I saw a soft terminator, but this time bright poles with darker collars, and a bright chevron feature over the middle of the disc.

 

After Venus I tried sweeping for Mercury but no luck, and then the clouds returned. Raining all day today so I'm catching up with my sketches.

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#9 Quinnipiac Monster

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Posted 09 May 2021 - 04:41 PM

Well that's a whole different level :) Thank you for sharing. Relentless bad weather here... or very windy.



#10 Quinnipiac Monster

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Posted 27 May 2021 - 08:37 PM

I managed to stash another observation of Venus today. This time I set up my telescope on the driveway (looking SW) rather than in the backyard (SE), at around 5-5:30 local time seeing was still not good but definitely better than 2 or 3 hours earlier. Looks like a keeper laugh.gif

 

One always has the impression that the aspect of Venus depends on... how you look at it! tongue2.gif Anyway, in white light one could already see a band around the S pole (a collar?), a sort of bright band crossing diagonally the center of the disk, and that the N hemisphere was darker. Some more details with the #80A I used for the sketch, but I am always very suspicious of fine details on Venus. The terminator was nicely shaded.

 

The sky was crystal clear, so I tried to find Mercury that should have been one mere degree N and a couple degrees E, but no luck. I am having a really hard time with that little one, last year right in these days it was way easier to get it into a low-power eyepiece (SP 26mm, 67x, c. 40'). I cursed the setting circles, the bubble level, the maker of the telescope (namely myself), then I figured out a better reason. Mercury's magnitude is +2, last year on May 20th it was -0.7. I guess this made the difference, but I'd love to hear from anyone who has more experience in the observation of Mercury. 

 

newton 10" f/7, 260x, 21:20UT. Sketch made with a #80A.

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Edited by Quinnipiac Monster, 27 May 2021 - 08:45 PM.

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#11 Quinnipiac Monster

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Posted 09 June 2021 - 07:19 PM

Seeing was nothing to write home about this afternoon, and clouds kept coming and going but it was at least a usable day. Shaded areas in the northern and southern hemisphere, with the N polar region way brighter than the other one. As for the rest... well it's Venus, hard to decide what you are seeing.

 

At least I am getting better at finding it, even today I could put it directly in a low-power eyepiece (67x) using the alt/az circles (plus an assortment of other circles and bubble levels to set up the equatorial platform right). 

 

Newton 10"/7, 260-330x, no filters.

 

 

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#12 mdowns

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Posted 09 June 2021 - 08:34 PM

Your continuing thread is fast  becoming one of my 'go to topics' Ivano. Wonderful drawings and idea!        Michael


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#13 Quinnipiac Monster

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Posted 17 June 2021 - 06:28 PM

Good transparency yesterday evening, seeing so-so but still usable. This has been the first time I have done a sketch with a #38A, quite popular among experienced observers of Venus but that I have always found too dark. As I suspected, you need to give it a chance, namely give your eye the time to adapt to a much darker image than with, say, a #80A or integral light. Phase in integral light seemed to be between 90% and 95%, but closer to the latter (Winjupos says 92.7%).

 

The sort of band S of the equator and the dark area in the N hemisphere close to the terminator were the easiest dark patches to spot. Terminator shading also best visible in the same area. 

 

Newton 10"/7, 330x, both sketch and intensity/visibility estimates with a #38A

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Edited by Quinnipiac Monster, 17 June 2021 - 06:33 PM.

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#14 chrisrnuttall

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Posted 19 June 2021 - 11:41 AM

They're some pretty nice sketches Ivano! And the sweeping bands in the clouds look very realistic too.

I find with w38a and w47 that I need to block out all the daylight so the glare doesn't interfere.
Last week I was using the two end caps from my 12" either side of my head....like a cross between princess leia and Mickley mouse, much my to my wife's amusement.
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