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Hazy clear observing on 6/8/20.

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#1 Rich5567

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Posted 07 August 2020 - 03:42 PM

Hi all,

 

A hazy 'clear' night last night, thought I would have a quick session of doubles and variables before bed.

 

First starting point was STF 2499 VULPECULA, an 8.8 and 9.1 pair with a seperation of 2.6". I think the haze may have helped steady the image as the secondary was quite crisp at 270x.

 

A nice wide system next, J 2959 SAGITTA, 7.8, 11.8, 93.2", so nice and wide. B was quite faint what with the high thin cirrus cloud, but was visible at 270x. C was not visible at all, and after much squinting into the eyepiece I gave up, I was tired in my defence.

 

Back into the fox with STF 2457 VULPECULA. 10.1 and 10.2, with a sep of 10.2". Lower powers did not show anything, but adding the barlow gave a nice view of B at 270x.

 

My last if the session was STF 2455 VULPECULA AB: 7.4, 9.4, 9.6". AC: 7.4, 12.3, 20, 99.6" a nice triple with C only seen due to its distance from the primary.

 

I failed to split 16 Vul yet again, thats going to be a thorn in the side that one, and HDS 2708 SAGITTA, which has a seperation of 6.0", but would not split at any magnification, one of them nights I suppose.

 

The rest of the evening was variable observing which is easier with no drive as you need a wider fov.

 

Fingers crossed for clear skies over the weekend,

 

Cheers,

 

Rich.


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#2 c2m2t

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Posted 09 August 2020 - 02:01 PM

Hi Rich!

A fine report as always! Some interesting finds! I have 4 images to add, 3 previously processed...STF's 2455 & 2457 and HDS 2708 and J 2959 that I processed today...not many stars in the field which allowed a quick processing.

 

I am not surprised that you could not see the "C" component in Jonckheere 2959 at magnitude 13.66...I was surprised I was able to catch a whiff of it in a 30 second exposure at ISO 800 but with some push, it was there. I am not sure how it will resolve here on CN...all we can do is try.

 

Your report for STF 2455 surprised me a bit. When I look at my image, "C" appears fairly strong. A check of the data provides a Vmag for "C" of 12.30. Right away I am suspicious because a mag 12.30 for most of my 30 second exposures at ISO 800, 12.30 is usually just a hint without a lot of manipulation of the image data. A quick check of the UCAC4 catalogue does not provide a Vmag for "C" but using the formula that generates a Vmag from the J & K data provides a Vmag of 11.56 which relates well to my image. A subsequent check of the NOMAD catalogue provides a Vmag. of 12.30  but the J & K values are exactly the same as the UCAC4 data. I think I am out on a pretty solid limb here when I say that I think the data is suspicious...another system to add to my growing list.

 

Your report of STF 2457 was also a surprise. My image does not resemble your notes...were you having difficulty at lower powers to pull "B" out of the glare of the primary? Your 10.1 and 10.2 at 10.2 arc-seconds should have been fairly straight forward I would have thought. The data I am getting from the WDS shows magnitudes of 7.46 and 9.52, which might explain the difficulty of splitting at low magnifications. I am thinking that the hazy skies may have played a bigger role in your observations as well. My image does support the 7.46 & 9.52 magnitudes. When you had the wider field in your eyepiece, did you happen to notice the mini Bootes asterism that appears in the image?...it may not be so obvious in a flipped field.

 

I am looking forward to getting back to some observing. I am in the midst of a construction project at my son's home. The summer heat has left the tank rather empty. There is some incentive though...it is a deck around a new above ground pool that has a reserved sign saying "Grampa"s Spot" right at pools edge!!grin.gif

 

Cheers, Chris.

Attached Thumbnails

  • J 2959-397-pt-ns.jpg
  • HDS 2708-7988-ns-ID.jpg
  • Struve 2455-8539-ns-ID.jpg
  • Struve 2457-8207-ns-ID.jpg

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#3 rugby

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Posted 09 August 2020 - 02:59 PM

Here are my notes: STF2454: jULY 9 2019 8 INCH SCT easy at 250, July 12 2020 120mm refractor easy. I have another obs fromJuly 9 2019 that states difficult so seeing must be a factor.
STF 2457: July 12 2020 easy in a 120mm. Sorry, no other details
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#4 Rich5567

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Posted 10 August 2020 - 01:59 PM

Seeing was poor that night, I could barely make out Cassiopeia or Cygnus, the zenith was a little better but I always steer clear of that neck and back breaking area of the skies.

 

I was out last night and it was the same again, hazy skies and dew settling onto the scope after only half an hour or so.


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#5 Rich5567

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Posted 11 August 2020 - 01:35 AM

Chris,

 

With regard to STF 2457 VUL, the mags of 10.1 and 10.2 is a typo, they should be 7.4 and 9.5 as you pointed out.




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