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Synchronicity

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Posts posted by Synchronicity

  1. I have attached the WBPP log file, a single flat frame and the master flat. 
    When stretched with STF the single flat frame shows some of the detail you'd expect but at very low level but the master flat shows nothing at all.  I used the Flats Aid in APT - Astro Photography Tool with a target ADU of 20,000 to take the flats.

    The log from APT shows

    Quote

    2023/11/25 02:53:41 (UT 2023/11/25 02:53:41)    Op    Target ADU range reached with exposure 0.11383 s. Current ADU: 19145.3

    I'm off to check if the target I used is correct for this camera.

    Thanks

    Michael

    F_Andromeda2_2503_Bin1x1_0.11383s__-15C_G111.fit masterFlat_BIN-1_5496x3672_FILTER-NoFilter_CFA.xisf 20231128000200.log

  2. Taken overnight 24th this month I have 120x90s exposures and 60x30s.  I ran these through WBPP which I had reset to factory defaults.  Apart from setting the output directory the only change I made was selecting the 'low quality' preset.

    This is the master of the 30s files.  It has a strong gradient, possibly related to the Moon which was, I think about 90%.

    STF-masterLight_BIN-1_5496x3672_EXPOSURE-30.00s_FILTER-NoFilter_RGB_autocrop.thumb.png.45aa99fa29bf59ca01369a70cd81465d.png

     

    This is the 90s master which looks to me as if the Flat hasn't been processed?

    STF-masterLight_BIN-1_5496x3672_EXPOSURE-90.00s_FILTER-NoFilter_RGB_autocrop.thumb.png.abf705621345960c81e976b049c14fcc.png

    The 30s exposures were taken immediately after the 90s and the flats were done after that.

    I'm at a loss for what to do next.  I read in a thread tonight that using Bias frames could affect the dark subtraction so I'm rerunning without those but I can't see how that could cause what I'm seeing.

    This is the WBPP summary screen.

    b2023-11-2719_37_22-WeightedBatchPreprocessingScriptv2.5.9.png.709e06e3f7fd9dee24abab23a6a0f43c.png

    Any suggestions would be extremely welcome!

    #EDIT: Taken with Esprit 80 and L-Enhance filter.

    Thanks

    Michael

  3. 7 hours ago, CCD-Freak said:

    I use this one for my laptop when we're off grid in the motor-home.  Same idea but this is variable 15-20v.
    Doesn't seem to be in stock just now though.

    https://www.amazon.co.uk/gp/product/B071SDW4QG

    Michael

    • Like 1
  4. I  just got this by email.

    About Are we alone in the universe?

    Welcome! The UCLA SETI Group uses the largest fully steerable telescope on Earth to search for evidence of civilizations in the Galaxy. We use the 100 m Green Bank Telescope in West Virginia to scan stars and their planetary systems at radio frequencies with the goal of detecting signals emitted by radio beacons or other powerful radio emitters. So far, we have observed 40,000 stars and detected over 60 million radio signals. Help us identify the most promising signals and match signals to common classes of radio frequency interference (RFI). Your classifications will be used to train a machine learning algorithm that will accelerate the search by separating interesting signals from RFI.

    https://www.zooniverse.org/projects/ucla-seti-group/are-we-alone-in-the-universe?utm_source=newsletter&utm_id=AreWeAloneBeta21nov2022

    Enjoy!

    Michael

    • Like 2
  5. I posted a thread with a couple of PHD2 videos and one thing I realised from watching them was that any cable hanging loose is a risk but any cable hanging loose from a camera can induce movement and/or vibration in the camera.  A small breeze or the cable shifting position as the mount tracks can be enough.  It might not ruin the image but we do so much to ensure precision and improve image quality yet this seems to be a common blind spot.

    Michael

    • Thanks 1
  6. I've recently bought a ZWO ASI 183MC-PRO and my process was reasonably simple and similar to what you are doing. 

    • I searched for that camera and the others I was considering in this forum and read what was said. 
    • I searched https://www.astrobin.com for images taken with the camera and my scope - an Esprit 80.
    • I entered the scope and camera spec into the Ocular settings in Stellarium and used that to get an idea of the framing and size of various targets I was considering.
    • I did the same with the telescope simulator at https://telescopius.com/

    For the detailed specification of the cameras I found that price was filtering them down anyway so the list wasn't too big!

    HTH

    Michael

    • Like 1
  7. 1 hour ago, cajen2 said:

    An aquarium heater is a definite no-no (I have four aquaria and have kept tropicals and marines most of my life). They are NOT designed to be run in air.

    If you want to save a bit of money on a scope cover, try this (or a similar one):

    https://www.amazon.co.uk/FiNeWaY-Waterproof-Breathable-Protector-Protection/dp/B09CZKKG8K?pd_rd_w=MZcuI&content-id=amzn1.sym.2fea9265-6ce8-40b5-908e-3e55f1bdf7f9&pf_rd_p=2fea9265-6ce8-40b5-908e-3e55f1bdf7f9&pf_rd_r=DCJHPVG3RTRXB5DW6W37&pd_rd_wg=tfPnF&pd_rd_r=9dad6c91-257e-478e-80ea-81beaf8661cf&pd_rd_i=B09CZKKG8K&psc=1&ref_=pd_basp_bia_rpt_ba_s_2_sc

    It's breathable and designed to be used outside for months. £15 because it doesn't have the word 'Astro' on it! 😄

    I'll second that opinion.  I bought one of these a few months ago and so far it's doing the job nicely - mount on a pier though, the scope stays indoors. 
    I always bring the cover indoors when I take it off and leave it positioned so that any dampness inside can dry off.  We'll so how it lasts the winter though...

    Michael

  8. I'm watching a video that popped up on my Youtube feed a couple of days ago. 

    The Ins and Outs of PHD2 Calibration with Bruce Waddington, one of the PHD2 developers.  Bruce starts by explaining what the basic intention of guiding is and then goes through how and why PHD2 does what it does and highlights several issues and misunderstandings.

    A thoroughly enjoyable watch and perfect for me as I have used PHD2 for several years by following the setup steps by rote but not really managed to understand what the displays are telling me.

    All the best

    Michael

     

    • Like 3
    • Thanks 2
  9. 52 minutes ago, John Wick said:

    Agree with what you say about the objects i mentioned, i have yet to put Stellarium on my PC, but is there an app that will show what my focal length will capture, sure i have seen as such for Staellarium (appears like a rectangle on the night image?)

    Stellarium on the PC will do exactly that.  Ensure the Oculars plugin is activated and there will be small window - top right corner in mine - that lets you set up your camera, lens etc. 

    Michael

  10. This is a thought experiment but my knowledge is too limited to get to the end of it, hence I'm asking the multimind here 😉

    If all the imagers here concentrated on the same piece of sky for one or more nights we could amass thousands, or even tens of thousands of hours of data.
    Assuming we could share that data and filter it for quality, and had access to the computing power, what are the limitations which would stop someone combining that into an ultra deep field type of image?  Would there be a limit to the magnitude imagable from within the atmosphere, would distant objects be too small to resolve or what else would limit what could be achieved?

    I'd be interested in everyones thoughts.

    Michael

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