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starbuck

09 Noi 2015 15:11



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Cred ca acea formula descrie magnitudinea absoluta si nu aparenta pe care o observi tu de fapt iar in acest caz distanta pana la acele corpuri ceresti este factorul neconsiderat.
Daca citesti in articolul mentionat de pe wikipedia imediat dupa formula respectiva ai urmatoarea precizare, citez:

"For astronomical objects, surface brightness is analogous to photometric luminance and is therefore constant with distance: as an object becomes fainter with distance, it also becomes correspondingly smaller in visual area. In geometrical terms, for a nearby object emitting a given amount of light, radiative flux decreases with the square of the distance to the object, but the physical area corresponding to a given solid angle or visual area (e.g. 1 square arcsecond) increases in the same proportion, resulting in the same surface brightness.[5] For extended objects such as nebulae or galaxies, this allows the estimation of spatial distance from surface brightness by means of the distance modulus or luminosity distance."

Asadar marimea fizica pe care trebuie s-o masori in cazul tau de masuratori este distanta luminozitatii descrisa in:
https://en.wikipedia.org/wiki/Luminosity_distance