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Some Venus Observations

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#1 chrisrnuttall

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Posted 24 January 2020 - 02:48 PM

Hi all

 

Venus is well placed for observation from my observatory for the next couple of months, until it starts to disappear behind the neighbour's house at around the time of quadrature. This means I can use my 12" scope to observe fairly regularly and I don't have to resort to the littl'un from other locations.

The seeing has been pretty good for me lately and I have had some unusually steady views just before sunset.

The ADC really helps with the image sharpness, and when used with the apodizer and W47 violet filter, the planet stands still and well resolved in the eyepiece.

I can push the magnification up a little, and if I shade my eyes against the day lit sky, subtle shading and streaks then start to become apparent over the planet's disc.....

 

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  • Veuns 2020 01 12.jpg

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#2 chrisrnuttall

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Posted 24 January 2020 - 02:49 PM

The 18th was not as good as the 12th, but still a very decent view.

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#3 niteskystargazer

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Posted 24 January 2020 - 03:02 PM

Chris,

 

Nice sketches of Some Venus Observations smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#4 frank5817

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Posted 24 January 2020 - 03:04 PM

Chris, 

 

Thank you for posting these here. Excellent detail in the cloud brightness variation.

Very nice.

 

Frank :)



#5 alvarete

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Posted 24 January 2020 - 03:37 PM

Hi Chris,
it is a real luck that you had post this sketches!
After 30 years of observing this planet with a lot if telescopes I was decided to do not give it mote opportunities to show me its clouds.
I was saying myself that it was not possible tu see clouds in visual. Last years I use 5" and 6" apos and 8" MN.
I will try it some more times!
Any concern besides violet filter??
Fantastic sketches

#6 chrisrnuttall

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Posted 24 January 2020 - 04:21 PM

Alvarete

 

OK here are all the factors I find helpful in observing details on Venus....

 

I find the W47 violet filter to be very useful on Venus, I do sometimes use the W29 deep red filter but to me there is never as much detail with this one. Other observers report different results and I suspect that I am more sensitive to the violet end of the spectrum than to the red end.

David Gray uses a stack of green filters to good effect in his Venus observations.

You could try different colours and see what works for you.

The filters not only restrict the light to one part of the visible spectrum, but importantly they reduce the brightness of the image so that it is possible to see the very subtle variations in brightness of the cloud tops. Using a dark filter (appropriate to your telescope aperture) really helps.

 

I use an apoziser which I find always improves the image steadiness no matter what the conditions are like, but has the side effect of reducing colour saturation. Apodisers work better on larger telescopes. I also have one for my 5" mak but it doesn't improve the view in that telescope at all. I would think that using one on your 8" would be of some benefit.

 

For a year now I have been using an Atmospheric Dispersion corrector, and have found that it improves image sharpness on every planet I use it on, even Uranus and Neptune showed a clear benefit and they were quite high in my sky. For lower altitude observing the ADC is excellent in all telescopes, it can transform an unobservable ball with bad colour dispersion into a pretty decent disc.

 

I have also used a range of telescopes on Venus. 5" Maksutovs, 8" Newtonians, 12" Newtonian. The larger aperture telescope always wins on planets. I only own a smaller scope for occasions when I can't point my large scope at the planet I want to observe so I must travel to different location with a better horizon.

 

Lastly I always try to observe when Venus is high in the sky. I start before sunset (making sure the sun is behind a building) using go-to, or setting circles, or even just a digital angle finder to point the telescope in the right direction. You need the best seeing you can get.

 

Good Luck!


Edited by chrisrnuttall, 24 January 2020 - 04:24 PM.

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#7 Sol Robbins

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Posted 05 February 2020 - 11:51 PM

Great sketched observations. They pretty much match my own using variable dielectric neutral density filter,

(V-DND) in my 8" reflector. Thanks for sharing them.



#8 sunnyday

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Posted 05 February 2020 - 11:56 PM

nice work 



#9 Aquarellia

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Posted 06 February 2020 - 01:38 AM

Oh, whaw I like it!

Your sketch quality and the "travel sketch book" style you use are fantastic!

Indeed I have eye concern with the W47 on Venus, as well with the Calcium filter on the sun, however no issue to look through a Halpha filter or to avoid purkinje effect on the Betelgeuse visual estimation.

Anyway Bravo for your sketches and all your CN gallery here.

Michel



#10 DDEV

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Posted 09 February 2020 - 08:14 AM

Hi Chris,

Two fine sketches if Venus, equally great descriptions. Well done!

#11 Special Ed

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Posted 09 February 2020 - 04:06 PM

Chris,

 

Beautifully rendered observations of our sister planet.  smile.gif 

 

What media are you using?  It looks like color paper and pastels.



#12 chrisrnuttall

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Posted 14 February 2020 - 02:51 PM

Hi Michel

 

the sketches are done with pastel pencil on velour paper.

I print out the blank disc first before filling in the details,



#13 ricksmith

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Posted 24 February 2020 - 09:26 PM

Nice to see something similar to what I'm seeing

#14 ricksmith

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Posted 24 February 2020 - 09:36 PM

Nice to see something similar to what I'm seeing

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#15 ricksmith

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Posted 24 February 2020 - 09:39 PM

Now I know I'm not crazy LOL

#16 ricksmith

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Posted 24 February 2020 - 09:49 PM

I'm using 2" baader planet filter set of all 6 in the diagonal ie separately. At times yellow is ok, green and orange a little less detail, blue, dark blue and red have been the best, but all are useful because they allow certain EMR through which with a color wheel can allow one to blend and approximate true visual colors. The last brown sketch was mostly at 361x ie 530 cst baton rouge where venus was at over 40 degrees alt. With 11 quick sketches, I may have seen up to 20 or more features. I feel that because the anet is so dynamic ie surface pressure 90x earth and 400mph upper winds and 800F temps, a one hour observing session may very well show changing features

#17 chrisrnuttall

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Posted 14 March 2020 - 09:41 AM

Finally managed to get another sketch of Venus, several storms in a row kept me from observing for around a month, and even after they passed there was the usual need for a clear early evening sky with good seeing to happen when I was actually at home (not work) to make use of it.

 

Venus nearing 50% now, and will be lost over my neighbour's rooftop soon afterwards unless I start observing well before sunset.

 

 

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  • Venus 2020 03 08 low.jpg

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#18 niteskystargazer

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Posted 15 March 2020 - 08:50 AM

Chris,

 

Nice sketch of Venus smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#19 chrisrnuttall

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Posted 21 March 2020 - 02:37 PM

Yesterday I was able to observe Venus at 18:00 just as the sun was setting. The seeing was good, but variable.

I initially observed in W47 violet light.

Then White light.

Then I tried a couple of different greens, including W56 followed by my 1000 LP2 filter, which actually gave a really nice view, the best view of the differences between the shapes of the North and South cusps in fact.

By this time the seeing was not so good so I gave up, but I'm going to try it again when I can; the brightness was about perfect and I have high hopes for a nice view...

 

Visually I estimated the phase at 50%, which is 6 days early as the theoretical phase was actually 53%.

 

Both cusps were bright. The South cusp looking blunted and having the larger bright area of the two.

The North cusp, by contrast was sharply hooked and showed a smaller amount of bright material, whic was bounded by a defined dark collar.

 

Some subtle banding was noted over the disc, darker towards the south.

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  • Venus 2020 03 20 low.jpg

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#20 niteskystargazer

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Posted 21 March 2020 - 02:57 PM

Chris,

 

Nice sketch of Venus smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#21 chrisrnuttall

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Posted 27 March 2020 - 04:14 PM

Venus on the 25th. I observed at 16:30, almost 2 hours before sunset, the seeing was good, and using the 1000 Oaks LP2 filter I had a great view with good contrast at just the right brightness level.

 

The phase appeared to be less than 50%

The cusps were both bright, with the North cusp having a better defined dark collar.

I noted some darker clouds on the limb in the far south, and some Y shaped cloud stretching to the limb at the equator.

 

Another try at the same time today but there was a cold breeze, and the seeing was swinging wildly from Ant 2 or 3 to Ant V and back again, so left it til sunset, when things were a little calmer, but still not good enough to make a decent sketch.

Forecast cloudy for a week now.....

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  • Venus 2020 03 25 low.jpg

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#22 frank5817

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Posted 27 March 2020 - 09:58 PM

Superb capture of Venus. This one is very impressive.

 

Frank :)



#23 niteskystargazer

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Posted 28 March 2020 - 12:04 PM

Chris,

 

Nice sketch of Venus (On 3 25 2020) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom




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