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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205, The star νAnd, The star 32And, The star ρAnd, The star θAnd

Image of the day 04/08/2013

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    M31 & Comet Pan-STARRS for 6 consecutive days, 





    
        

            hims1526
    M31 & Comet Pan-STARRS for 6 consecutive days

    Technical card

    Resolution: 2048x1365

    Dates:April 6, 2013

    Frames: 200x60"

    Integration: 3.3 hours

    Avg. Moon age: 25.63 days

    Avg. Moon phase: 16.25%

    Astrometry.net job: 86879

    RA center: 8.199 degrees

    DEC center: 41.221 degrees

    Pixel scale: 14.940 arcsec/pixel

    Orientation: 122.101 degrees

    Field radius: 5.106 degrees

    Description

    Camera: Canon 500D
    Lens: Day 1-2: EF-85mm & DSS 2x drizzle, f/4, iso 800, 60 seconds
    Day 3-6: EF-200mm 2.8L, f/3.5, iso 800, 60 seconds
    Mount: HL-1
    Filter: Astronomik CLS-ccd filter
    Software used: DSS, PixInsight, PS
    Location: Leicester, UK

    Day 2 -6 are all stacked onto day 1's. Thus form this image.
    The comet should appear to be dimmer each day, however, this phenomenon does not appear on this image because
    1) I have used 85mm and DSS 2x drizzle for the first 2 days, hence a rather low S-N ratio, whereas for day 3-5, I have used 200mm 2.8L therefore a rather hgih S-N ratio.
    2) I used f/4 for the first 2 days and f/3.5 for day 3-5, this caused the brightness difference
    3) PS technique was not so familiar for the first 2 days
    4) Number of frames for day 1-2 were <25 and for day 3-4 >40... this provides the high S-N ratio
    M31 is enhanced with a photo taken back in Sept2012 in Yinna Hill, China

    Comments

    Author

    hims1526
    hims1526
    License: None (All rights reserved)
    5025
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    M31 & Comet Pan-STARRS for 6 consecutive days, 





    
        

            hims1526