Venus 2017

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Venus 2017

Postby Aratus » Mon Dec 26, 2016 9:43 pm

Venus is certainly looking bright in the South Western sky aften sunset. It has, up until now, been a rather boring, small disk. It is now a little larger and a little more than half phase. I had wanted to observe it mid-afternoon, but the sun is so low it was impossible for me to align on it. I managed to image it later in the afternoon, but it was pretty low down, which makes getting sharp, well formed images difficult. This is one I took on 26th Dec @ 1618 UT. 15% of 1000 images stacked.
Image

If anyone else has observed this or imaged it, feel free to add posts here if you wish. It will get bigger, brighter and more crescent-like in the next few months.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
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Re: Venus 2017

Postby andrewscomputers » Tue Dec 27, 2016 11:45 am

Hi Aratus this is an image I did about 5.45pm yesterday with a 2x barlow but the conditions were not favourable with the atmosphere as it was quite unstable and the image is a bit distorted around the edges as it is not in an ideal position as it drops quite quickly in the sky.
Thanks
Andy :)
Attachments
v1.jpeg
Venus 2xBarlow
v1.jpeg (4.05 KiB) Viewed 1235 times
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Re: Venus 2017

Postby Aratus » Tue Dec 27, 2016 4:33 pm

That's pretty good. Venus is really hard to get any meaningful image with. It is so bright and so featureless that it is hard to know when you have the correct exposure. Getting a sharp edge isn't always a sign of good focus. It can just mean too much contrast. A soft edge doesn't always mean a bad focus. There is often a 'halo' effect. I always look for a bright sharp limb and a softer terminator - if I can.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
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Location: East Lincolnshire

Re: Venus 2017

Postby Aratus » Thu Dec 29, 2016 6:44 pm

The air was remarkably still today (29th December) and I was able to get a much better image of Venus while it was still fairly high in the sky. 40% of 500 images stacked. No other processing. Venus is now 58% illuminated and a respectable 21 arcseconds across.

Image

Venus should reach half phase on 13th January 2017
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
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Location: East Lincolnshire

Re: Venus 2017

Postby andrewscomputers » Thu Dec 29, 2016 11:47 pm

Hi aratus I like the image it captures it really good.
Thks
Andy
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Re: Venus 2017

Postby Aratus » Wed Jan 11, 2017 7:40 pm

On 11th January, Venus is predicted to have a phase of 51% - or slightly over half.
However, the image I took shows it to be slightly less than half. This is called Schröter's effect, and is well documented, but the reason for it is not known for certain.

Image

If it could be imaged on 13th - the day it should exactly half, that would be interesting.
Last edited by Aratus on Wed Jul 26, 2017 6:20 pm, edited 1 time in total.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
Posts: 567
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: Venus 2017

Postby Aratus » Thu Feb 02, 2017 1:04 am

A couple of weeks of cloud has prevented me from observing Venus, but this evening - for half an hour - the sky cleared. Venus is nice and high now, and the seeing was pretty good. Venus continues to increase in size, which makes it a little more interesting. The phase is certainly more of a large crescent now.

Image
Last edited by Aratus on Wed Jul 26, 2017 6:22 pm, edited 1 time in total.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
Posts: 567
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: Venus 2017

Postby The Man with the Corrugated Iron Roof » Fri Feb 03, 2017 4:25 pm

I tried using a webcam recently and it was dancing like John Travolta.
How can I be one with the universe when we don't know what 96% of it is.

My website: http://www.philippughastronomer.com/

My blog: http://sungazer127mak.blogspot.co.uk/
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Re: Venus 2017

Postby Aratus » Fri Feb 03, 2017 6:03 pm

You can't blame the 'summer nights'! :D

In those conditions we just have to wait for another day. :(
You might try observing earlier in the day. Currently Venus is at its highest about 3pm, but there is no guarentee it will be better.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
Posts: 567
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: Venus 2017

Postby Aratus » Sat Feb 18, 2017 7:45 pm

Another fleeting glimpse of Venus around the clouds on the 18th February. Venus is a now a healthy 40 arcsecs across, with a 26% crescent and just about at its brightest. Just for a bit of fun I imaged Mars to the same scale and put it on the same photo. Mars is now about 5 times more distant than Venus.

Image
Last edited by Aratus on Wed Jul 26, 2017 10:34 pm, edited 1 time in total.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
Aratus
 
Posts: 567
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

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