Splitting doubles #1: epsilon Lyrae

Nice widely separarted double(-double) star – good starting point for a new little "sport" project, which, I hope, would culminate in splitting Sirius A and B. Well, this system is a challenge by itself – both ε1 and ε2 are not resolved as doubles here.

Well, I was going too boldly. With pixel scale of 1,18" and blobish stars with average diameter of 11 pixels it is not a good idea to split pairs separated less than 2,5" each. Time for the Barlow lens!

Aquisition time: 02.05.2013 02:05 MSK (GMT +4).
Equipment:
Canon EOS 60D on Celestron Omni XLT 150 mm Newtonian mounted on Celestron CG-4 German equatorial mount with RA drive.
Aperture 150 mm
Focal length 750 mm
Tv = 25 seconds
Av = f/5
ISO 3200, 2000, 1600, 1000, 400
Exposures: 6 (2@2000 and by 1 on all othe ISO values)
Processing: all images were converted to 16 bit TIFF and processed with Deep Sky Stacker. Resulted image was cropped to 2048×2048 pix and contrasted in Photoshop.

4 Comments on “Splitting doubles #1: epsilon Lyrae”

  1. astrometry.net

    Hello, this is the blind astrometry solver. Your results are:
    (RA, Dec) center:(281.046359978, 39.4950121511) degrees
    (RA, Dec) center (H:M:S, D:M:S):(18:44:11.126, +39:29:42.044)
    Orientation:100.46 deg E of N

    Pixel scale:1.18 arcsec/pixel

    Parity:Reverse ("Left-handed")
    Field size :40.36 x 40.36 arcminutes
    Your field contains:
    The star ε1Lyr
    The star ε2Lyr
    The star ε2Lyr

    View in World Wide Telescope

    —–
    If you would like to have other images solved, please submit them to the astrometry group.

  2. Sergei Golyshev

    [http://www.flickr.com/photos/dihib] Good for you! Judging on your Stellani nocti shots you have really good skies. "Star effect" is an artifact of Newtonian optics, so it is free :) It looks pretty and I myself welcome it as a cool feature when it does not interfere with the object I’m interested in. Here it is really unwanted :) But it is the challenge: to remove it by adjusting the exposure and still keep all the other stars on the picture.

    As for the adapter: it’s an "eyepiece projection kit". It allows to make the picture bigger, but requires an eyepiece good enough to not to distort the image and small enough to fit into the barrel. I have such a thing, but I never use the "barrel", only its "nosepiece" to attach the camera (via T-ring) to the focal extender (also known as Barlow lens). I just set the T-ring on the T-thread of the telescope and attach the camera.

    Feel free to ask, but bear in mind that I’m just a beginer in this field also :)

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