File:Luminance vs angular size.svg

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    Original file (SVG file, nominally 1,049 × 649 pixels, file size: 1.12 MB)

    This file is from Wikimedia Commons and may be used by other projects. The description on its file description page there is shown below.

    Summary

    Description
    English: Originally published here. Created from the data in this spreadsheet.

    This chart basically shows the relationship between surface brightness (in nits), angular size, and apparent magnitude for sky objects. The objects plotted here include:

    The angular diameters of stars were mostly taken from the JMMC Stellar Diameter Catalog (JSDC) version 2 (using the Uniform-Disk value in the V passband). In 7 cases (Adhara, Avior, Dubhe, Acrux, Spica, Hadar, Sabik) the JMMC SearchCal tool was used instead; and in 2 cases (Menkar and Arcturus) this Wikipedia page was used. The planets' magnitudes and angular diameters were taken from Stellarium for August 20, 2025. For the ISS, Stellarium gave a maximum angular diameter of 48.02 arcseconds, which corresponds to the truss length of ~108 meters. A projected area portion was calculated from this for an effective uniform-disc diameter of 43.1 meters, or 19.2 arcseconds.
    Date
    Source Own work
    Author Peter Markley (QuartzMMN)
    Other versions
    Highres PNG render

    Licensing

    I, the copyright holder of this work, hereby publish it under the following license:
    w:en:Creative Commons
    attribution share alike
    This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
    You are free:
    • to share – to copy, distribute and transmit the work
    • to remix – to adapt the work
    Under the following conditions:
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    • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

    Captions

    A scatter plot showing how familiar objects measure in magnitude, surface luminance, and angular diameter.

    Items portrayed in this file

    depicts

    inception

    20 August 2025

    data size

    1,179,342 byte

    media type

    image/svg+xml

    checksum

    0cfb7fa9f66430ed8df1873d0fddafc8fac71a8f

    determination method or standard: SHA-1

    File history

    Click on a date/time to view the file as it appeared at that time.

    Date/TimeThumbnailDimensionsUserComment
    current21:53, 11 September 2025Thumbnail for version as of 21:53, 11 September 20251,049 × 649 (1.12 MB)wikimediacommons>QuartzMMNUploaded own work with UploadWizard

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