| 单词 | radiometric magnitude |
| 释义 | > as lemmasradiometric magnitude radiometric magnitude n. Astronomy a measure of the intensity of the total radiation emitted by a celestial object that reaches the earth's surface, typically expressed on a scale in which zero is the visual magnitude of a type A0 star. ΚΠ 1922 E. Pettit & S. B. Nicholson in Publ. Astron. Soc. Pacific 34 182 In the sixth column of the table these deflections are given in terms of radiometric magnitude, which for convenience, we shall define as the magnitude of a typical A0 star which would give the deflection observed. 1934 R. C. Tolman Relativity, Thermodynamics & Cosmol. iv. 449 Δmr is the empirical correction to be added to the bolometric magnitude to obtain the radiometric magnitude as measured thermally after absorption by the earth's atmosphere. 1995 D. Leverington Hist. Astron. (1996) xiv. 305 For these very red stars,..a heat index was devised in the 1920s, that was the difference between the visual and radiometric magnitudes of the stars. < as lemmas |
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