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File:Luminance vs angular size.svg

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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
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Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • 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

File history

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Date/TimeThumbnailDimensionsUserComment
current19:53, 11 September 2025Thumbnail for version as of 19:53, 11 September 20251,049 × 649 (1.12 MB)QuartzMMNUploaded own work with UploadWizard

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