Page 2 of 6 FirstFirst 1234 ... LastLast
Results 11 to 20 of 59
Like Tree94Likes

Thread: strange stars

  1. #11
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now dep asst Grand Moff
    Points: 110,890, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.5%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Most Threads Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    12,548
    Points
    110,890
    Level
    100
    Thanks
    6,167
    Thanked 31,189x 9,600 Posts
    Blog Entries
    26
    Downloads
    0
    Uploads
    0

    Default Re: strange stars



    Quote Originally Posted by vvferi View Post
    Maybe... the thermal stress is a black hole for me.
    It needs some care but can be managed. First thing I'd try is more time (to let the system get into equilibrium) and patience. Less aggressive heating on the objective and cooling on the camera end could make a difference. Experiment, trying one thing different at a time.
    Gabby76 and vvferi like this.

  2. The Following User Says Thank You to not_Fritz_Argelander For This Useful Post:

    vvferi (01-08-2017)

  3. #12
    Johnny J.'s Avatar
    Johnny J. is offline SUPER GIANT
    Points: 14,206, Level: 82
    Level completed: 16%, Points required for next Level: 294
    Overall activity: 3.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    May 2015
    Location
    USA
    Posts
    912
    Points
    14,206
    Level
    82
    Thanks
    235
    Thanked 365x 309 Posts
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    Classic pinched optics on ED crystalline structure. Had one that showed same pattern. You can try and loosen the lens retaining ring. If it is a machined cell, then the cell is actually shrinking (contracting) more than the ED glass, compressing the crystal lens. Dew heaters do not have enough thermal energy to cause this. I had to send my scope back for a replacement. It was an Orion 120mm ED EON. Orion replaced it no problem. You can work with the vendor and get it replaced!

    Pattern in cold weather
    M42 2-21-09 120mm EON cold.jpg

    Same scope but during warmer temps
    M27 7-03-2016 120mm EON warm.jpg

    JJ
    j.gardavsky, DeanD, Pitter and 3 others like this.

  4. The Following 3 Users Say Thank You to Johnny J. For This Useful Post:

    bobharmony (01-12-2017),j.gardavsky (01-09-2017),vvferi (01-08-2017)

  5. #13
    vvferi's Avatar
    vvferi is offline White Dwarf
    Points: 593, Level: 11
    Level completed: 86%, Points required for next Level: 7
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jan 2017
    Location
    Hungary
    Posts
    20
    Points
    593
    Level
    11
    Thanks
    21
    Thanked 1 Time in 1 Post
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    Thank you all for giving me so much help! I think I have learned a lot!
    And I think it is a good way, to give you something experience back, from my misstakes.
    So, I dig out pictures from the past, and found, that 2 years ago I made pictures as much as conditions, like a week ago. And spikes were there too, but I did not payed attention enough. This 2015. January 7 picture shows, that the termel difference between lense temperature (outside temp., lets not deal with dewheating) and CCD temperature was 10°C, and there were spikes. The picture 2014. August 18.shows, that the termal difference between lense temperature (outside temp., and again, lets not deal with dewheating) and CCD temperature was 32°C, and there were NOT spikes. I tend to think, that there much more count the absolute outside temperature (lense, and lense holder cell temperature,) than the DIFFERENCE between CCD and lense, and lense holder cell temperature (outside temperature). I hope that you could read my not too perfect English ngc2244 reszlet techn2.jpgIC-1905 techn.jpg

  6. The Following User Says Thank You to vvferi For This Useful Post:

    j.gardavsky (01-09-2017)

  7. #14
    Lola Bruce's Avatar
    Lola Bruce is offline SUPER GIANT
    Points: 6,929, Level: 57
    Level completed: 90%, Points required for next Level: 21
    Overall activity: 3.0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!
    Join Date
    Jul 2012
    Location
    So cal
    Posts
    962
    Points
    6,929
    Level
    57
    Thanks
    17
    Thanked 216x 182 Posts
    Downloads
    2
    Uploads
    0

    Default Re: strange stars

    Frost on the sensor?
    Bruce
    vvferi likes this.
    CPC 800XLT, Takahashi 102 TSA, Takahashi Mewlon 250s,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

    Losmandy G11, Losmandy GM8, AP Mach1 GTO,
    (Nagler 3-6, 7,13,22, Panoptic 35,41, Delos 6,14, Powermate 2"x2), Pentax 10 Televue 8 Plossl
    DBK41, Atik Infinity

  8. The Following User Says Thank You to Lola Bruce For This Useful Post:

    vvferi (01-10-2017)

  9. #15
    UlteriorModem's Avatar
    UlteriorModem is online now Gold Supporter
    Points: 53,301, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 82.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Reply Award
    Join Date
    Oct 2015
    Location
    Tallahasse Florida
    Posts
    11,993
    Points
    53,301
    Level
    100
    Thanks
    922
    Thanked 2,769x 2,436 Posts
    Blog Entries
    4
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    So if it is pinched optics when it gets cold. What can be done if anything?

    Would a dew heater help?
    Johnny J. and vvferi like this.
    Scopes: Orion 130mm APO Triplet, Orion 8" f3.6 astrograph Mount: Celestron CGX-L Guiding: Orion 60mm f4 scope, Starlight Loadstar, PHD2 software - Cams: Planetary: ASI120mc, DSO:Atik 383L+, SGPsoftware Processing : Regisax, Deep Sky Stacker, Star Tools, Pixinsight Assistant: One very large cat
    ~ Put your money where your mount is ~


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  10. #16
    wboeck's Avatar
    wboeck is offline White Dwarf
    Points: 5,093, Level: 48
    Level completed: 72%, Points required for next Level: 57
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Nov 2010
    Location
    Omaha
    Posts
    15
    Points
    5,093
    Level
    48
    Thanks
    0
    Thanked 5x 5 Posts
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    I have an EON 120 and am getting strange stars in cold weather. It doesn't appear in warm weather. I am going to try and turn my dew heater to high with it on my ota right below the dew shield. I made the mistake of placing the heater strap on the shield directly above lens retainer and still strange stars. I figure warming the ota my help

    Wayne
    vvferi likes this.

  11. #17
    UlteriorModem's Avatar
    UlteriorModem is online now Gold Supporter
    Points: 53,301, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 82.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Reply Award
    Join Date
    Oct 2015
    Location
    Tallahasse Florida
    Posts
    11,993
    Points
    53,301
    Level
    100
    Thanks
    922
    Thanked 2,769x 2,436 Posts
    Blog Entries
    4
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    There is a 120 EON?
    Scopes: Orion 130mm APO Triplet, Orion 8" f3.6 astrograph Mount: Celestron CGX-L Guiding: Orion 60mm f4 scope, Starlight Loadstar, PHD2 software - Cams: Planetary: ASI120mc, DSO:Atik 383L+, SGPsoftware Processing : Regisax, Deep Sky Stacker, Star Tools, Pixinsight Assistant: One very large cat
    ~ Put your money where your mount is ~


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  12. #18
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now dep asst Grand Moff
    Points: 110,890, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.5%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Most Threads Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    12,548
    Points
    110,890
    Level
    100
    Thanks
    6,167
    Thanked 31,189x 9,600 Posts
    Blog Entries
    26
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    Quote Originally Posted by UlteriorModem View Post
    There is a 120 EON?
    There used to be. Why Orion withdrew it is a mystery.

  13. #19
    wboeck's Avatar
    wboeck is offline White Dwarf
    Points: 5,093, Level: 48
    Level completed: 72%, Points required for next Level: 57
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Nov 2010
    Location
    Omaha
    Posts
    15
    Points
    5,093
    Level
    48
    Thanks
    0
    Thanked 5x 5 Posts
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    It is an excellent scope. However it appears to have trouble in cold temps.
    Gabby76 and vvferi like this.

  14. #20
    vvferi's Avatar
    vvferi is offline White Dwarf
    Points: 593, Level: 11
    Level completed: 86%, Points required for next Level: 7
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Jan 2017
    Location
    Hungary
    Posts
    20
    Points
    593
    Level
    11
    Thanks
    21
    Thanked 1 Time in 1 Post
    Downloads
    0
    Uploads
    0

    Default Re: strange stars

    Quote Originally Posted by not_Fritz_Argelander View Post
    Possibly a thermal disequilibrium problem? My Rumak Mak Cass shows a threefold rather than your fivefold symmetric distortion when out of balance thermally.
    I am not sure ... Just wondering...By idea I put on the heating strap (~ 1,5" wide) right over the lenses. So the temperature in front of and behind the lenses should be near the same. Certainly just near, and I do not know, what is the difference which can make my stars funny.

 

 
Page 2 of 6 FirstFirst 1234 ... LastLast

Similar Threads

  1. 10 Strange Theoretical Stars
    By Braingasim in forum Off Topic Forum
    Replies: 5
    Last Post: 10-29-2015, 08:09 AM
  2. Strange stars in images
    By ma_khan in forum Astronomy Digital Cameras Forum
    Replies: 11
    Last Post: 07-22-2015, 06:33 PM
  3. Replies: 5
    Last Post: 06-05-2015, 07:52 PM
  4. Help! Strange purple fringing on bright stars.
    By lapointejs in forum Telescope Forum
    Replies: 4
    Last Post: 02-06-2012, 03:10 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 08:30 PM.