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  1. #1
    Carlos_dfc's Avatar
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    Default Ganymede shadow transit 23/09/09



    Sketched this between about 8:30pm and 9 last night

    I didn't realise there was a shadow transit until I actually looked through the EP, so very lucky there

    C8 - SCT - 13mm Hyperion adjusted to 9.2mm with finetuning ring (217x)
    Sketched on cheap copy paper, with HB for the planet, 2B for the shadow, and 6B for the background sky - and I used the nosepiece cap from a Hyperion eyepiece to get a nice neat circle for the planet.

    Scanned - Re-sized - Flipped left-right (I was using a diagonal) - a bit of a tweak to bright/contrast - and I flood-filled the background because I didn't like the look of the dark, heavy pencil marks.

    Seeing wasn't the greatest tho...



    I've also realised I need to get some better paper - copy paper gives a pretty coarse 'grainy' look to shading.
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  3. #2
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    Default

    Cool sketch Carlos. I like the old school stuff.
    name: Derek

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    and such.

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    Default

    Thanks Karl.. each time I see a members sketch I am a bit in awe. How do you get the "negative" image?

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    Sweet good job.
    "The mind works like a parachute; It works best when its open."

  6. #5
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    Thanks for the kind comments everyone


    Quote Originally Posted by GriffinBF View Post
    How do you get the "negative" image?
    When I sketch DSOs, I scan the drawing, then use Paintshop-pro, or photoshop to 'invert the image to negative.....

    With planets though - I just draw the planet 'as-is', then colour-in the background sky with a very soft pencil (6B in this case)

    I wasn't happy with the dark pencil strokes when I scanned this drawing though, they distracted from the shading on Jupiter - so I took a dropper sample of one of the darker strokes and 'flood-filled' the whole of the sky background so it would all be that same shade (no pencil strokes showing)
    A tolerance setting of 25 on the flood-fill, meant that the whole of the dark background sky was smoothed out to the same shade of very dark grey (almost black), but the lighter shades of the planet and moons were left untouched.
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  8. #6
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    Default

    And one for the diaries - so long as Jupiter is visible from your location at the time.....

    Monday 28th Septenber - 21:00 UTC
    Io transits Jupiter, and so does it's shadow - at pretty much the same time, Jupiter's great red spot also transits.
    At 21:00 - The GRS is in conjunction with Io's shadow - with Io also still crossing the face of Jupiter.

    Pic below is cropped from a screenshot of Starry Night Pro

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  9. #7
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    Default

    Great sketch of the shadow transit of Ganymede, Carlos! Thanks for the heads-up on the transit and shadow transit of Io this coming Monday.

    Eric
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  10. #8
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    Default

    Carlos,

    Nicely done on your capture of Jupiter. Loved the notion of using the cap from the Hyperion to make your circle! Very clever. Good observation of the transit and of the bands on Jupiter. Thanks for sharing it.

  11. #9
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    Many moons ago, I used to do a lot of sketches of the planets using a rather fine 8" refractor, (an antique instrument made entirely made of brass), in a friends observatory. I found it useful to prepare blanks for the planets in advance, especially when dealing with subjects like Jupiter or Saturn, as they aren't perfectly circular. This was pre-computer, and I spent ages working out and drawing templates for Saturn at various ring angles! Of course, it's much easier these days thanks to computers. I found it saved a lot of time and left more time to concentrate on the features. Anyway, nice sketches - it's good to see the tradition being carried on, and as soon as my scope appears, I'll be sketching and posting here. Great work!

  12. #10
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    Carlos this is really good stuff.
    Would like to have a go at this.
    Declan.
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