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Great (for where I live), seeing and the jet stream

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#1 Sully606

Sully606

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Posted 21 February 2020 - 12:13 AM

  Here in north Chicagoland there are not to many decent nights. This winter broke records for overcast days. 
  The last few days it has been clear and I’ve been out every night. As a beginner I’ve alway wondered whether it was me or the atmosphere that was the culprit in the limitations of my viewing. I think I have the collimation down thanks to Catseye, Vic, Jason and Starman Don. I’ve made sure my scope is properly acclimated and I have got my night vision in order. 
 Tonight was absolutely outstanding given the limits of the light pollution from a big city. The last two nights were relatively good and the only variable that I could determine was different was the jet stream. The last two nights the jet was 140 knots plus. Tonight thanks to the 14 degree weather the jet shifted south. 
 I thought my scope, up until this point wasn’t able to sit still. Everything I looked at always had a vibration that I blamed on the scope. Tonight all was calm and still. It really was amazing for me despite the cold. 
 My point here is that until the seeing is good don’t jump to conclusions. The variables in this hobby can all make a big difference. Thanks to all of you who support us beginners!

 

Sully

ps. Please don’t tell me the jet was not the difference, now I’ll have something else I have to think about!


Edited by Sully606, 21 February 2020 - 12:31 AM.

  • desertstars, happylimpet, outofsight and 5 others like this

#2 pyrasanth

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Posted 21 February 2020 - 07:45 AM

I've had the rare very good night where I get a FWHM of under 1.5 but it is mostly 2.2 or so. I agree the variables are so many that the best local weather forecast can't do better than you looking out of the window at a given moment. 



#3 desertstars

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Posted 21 February 2020 - 07:53 AM

 

The variables in this hobby can all make a big difference.

Has anyone pointed you to this site, yet? Many of us find it very helpful for anticipating the most important of those meteorological variables. I used a location that is apparently used by the Chicago Astronomical Society (http://www.gadboisproductions.com/cas/) Check the map for one closer to you if necessary.

 

https://www.cleardar...ngsILkey.html?1



#4 Sully606

Sully606

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Posted 21 February 2020 - 09:39 AM

I've had the rare very good night where I get a FWHM of under 1.5 but it is mostly 2.2 or so. I agree the variables are so many that the best local weather forecast can't do better than you looking out of the window at a given moment. 

Sorry for the ignorance but what does FWHM mean?

 

Has anyone pointed you to this site, yet? Many of us find it very helpful for anticipating the most important of those meteorological variables. I used a location that is apparently used by the Chicago Astronomical Society (http://www.gadboisproductions.com/cas/) Check the map for one closer to you if necessary.

 

https://www.cleardar...ngsILkey.html?1

Thanks for that. I’ve never seen the either of theses sites. They will come in handy. 
 

Sully




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