"pseudomagnitude" meaning in English

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  "etymology_text": "From pseudo- + magnitude.",
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      "form": "pseudomagnitudes",
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          "ref": "2016, Alain Chelli, Gilles Duvert, Laurent Bourgès, Guillaume Mella, Sylvain Lafrasse, Daniel Bonneau, Olivier Chesneau, “Pseudomagnitudes and Differential Surface Brightness: Application to the apparent diameter of stars”, in Astronomy & Astrophysics, volume 2016:",
          "text": "It makes use of two new reddening-free concepts: a distance indicator called pseudomagnitude, and a quasi-experimental observable that is independent of distance and specific to each star, called the differential surface brightness (DSB).",
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        "A measurement that gives an indication of size but which is not a true magnitude. For example some pseudomagnitude values can be negative."
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  ],
  "etymology_text": "From pseudo- + magnitude.",
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          "text": "It makes use of two new reddening-free concepts: a distance indicator called pseudomagnitude, and a quasi-experimental observable that is independent of distance and specific to each star, called the differential surface brightness (DSB).",
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        "A measurement that gives an indication of size but which is not a true magnitude. For example some pseudomagnitude values can be negative."
      ],
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          "magnitude",
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