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Rareden

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Posts posted by Rareden

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted

    1 hour ago, Wjolcz said:

    Has anyone here ever taken astropics with phone? I have Xiaomi Redmi Note 3 Pro but there's no shutter control so maybe photo stacking could work? I could take like 30 pictures all at once and then stack them but I don't even know if that would work or not.

    Depends on what your trying to image, the moon yes it would work but you wouldnt need to stack them, rather you could record a video and use something like "planetary image processor" to get a reasonable image
    If your trying to image a nebula or other deep sky object, it would be rather pointless depending on what the max shutter speed it has by default.

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted · Edited by Rareden

    1 hour ago, _Augustus_ said:

    It's far from perfect but at least I have the full thing now. Reprocessed video from the 26th.

     

    Bottom is looking very nice.

    Finaly seemed to have fixed my differential flexure issues with my setup, exposures before and after, 2 min before, 12min after. noise issue of course because i did no processing on them
    ECOPKCY.jpg

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted

    On 12/29/2017 at 3:29 PM, _Augustus_ said:

    Try using a bulb blower on it to remove the dust from the chip.

    also hold it with the sensor facing the ground when doing so,
    if its a dslr check if it has a sensor cleaning feature and cycle that a few times with it facing the ground with no lens

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted

    7 hours ago, kurja said:

    What problem did you have? I've seen batteries last for a lot less in arctic weather, and had a laptop crash unless heated, but all of my cameras have worked without a hiccup down to around -30 celsius.

    for some reason, nothing saved to the card

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted · Edited by Rareden

    20 minutes ago, munlander1 said:

    Going out again. Will try to do a more precise alignment and try again.

    Does ISO really matter?

    Iso matters greatly, its the sensors sensitivity to light, the higher the iso the more sensitive it will be to faint light, BUT it will also become more sensitive to the electrical noise and temperature of the sensors pixels which will cause it to produce "Fake signal" which is noise, makes your image look grainy with red blue and green spots. 
    There is a fine balance with iso, depending on what camera you have, typically iso 800 is a good spot, good cameras designed for low light you can do 1600-3000

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted · Edited by Rareden

    39 minutes ago, Green Baron said:

    Andromeda ca. 3.5*1,5°, m42 ca. 1.5*1.5°, together with the upper and lower stars of the sword maybe the same size as Andromeda galaxy ... +/- window cross.

    This might be a good opportunity to calculate your field of view from chip size and focal length ;-)

    And you need a tracking mount for that thing !

    i do, i have a AVX and guider with scope
    FOV at 600 should be 3.4 horizontal, 2.3vertical

    The Astro-Imaging Thread

    in Science & Spaceflight

    Posted

    1 minute ago, munlander1 said:

    Ok, so earlier around June this year, we were plannning to do a group astrophoto. Everyone would submit all their frames and they would all be processed together.

    I kind of glazed it over though.

    But I was thinking M42 would make a great target for it.

    sounds good, im currently imaging it

    Is eccentricity a vector?

    in Science & Spaceflight

    Posted · Edited by Rareden

    On 10/22/2017 at 6:27 AM, Pand5461 said:

    Right, ε is the only term that can change the sign. But the specific energy is not supposed to do that near circularization.

    @Rareden are you sure you use ε= v2/2 - μ/r in your calculations?

    one i was using for mechanical energy is - mu / 2 * SMA

    edit: went back to OP equation, made some changes and it works properly now TY all

    Is eccentricity a vector?

    in Science & Spaceflight

    Posted · Edited by Rareden

    switched to this equation, 56bf173b613ed5a2cc8485714c210108884d2c31
    however the problem im encountering with this is that once the orbit starts to circularize and AP Peri switch, e becomes a negative value which kills the equation since you cant square root a negative.

    Is eccentricity a vector?

    in Science & Spaceflight

    Posted

    4 minutes ago, Zeiss Ikon said:

    If you have a single well-defined position and velocity, and know the value and radius of the local gravitational field, you've got everything you need to calculate an orbit -- including finding the orbital elements.  Astronomers usually need three observations to define an orbit, because they can't directly measure velocity, and get position only as a direction from the point of observation.

    I can get absolute position in XYZ relative to planet center as well as players current velocity, strength of gravity at their distance.
    got the equations in C++, just trying to work out the issues such as my periapsis being a negative value that wont go higher than 15km, and my Apoapsis continuing to climb despite ceasing acceleration

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