If the stars are equally luminous, how much brigher will the nearer one appear than the farther one?
2007-01-31 12:34:29 · 2 answers · asked by Braden G 1 in Science & Mathematics ➔ Astronomy & Space
Distance = 1 / parallax, so the star with .1" parallax is 10 parsecs away and the star with .005" parallax is 200 parsecs away.
Apparent magnitude = absolute magnitude -5 times (log parallax +1). Also, absolute magnitude is the brightness of a star at a distance of 10 parsecs, so I will assign magnitude 0 to the star at 10 parsecs to compute the difference easily. m=0-5(log parallax + 1) m=-5(log.005 + 1), m=6.5. The 200 parsec distant star would be 6.5 magnitudes dimmer than the one at 10 parsecs.
2007-01-31 12:42:59 · answer #1 · answered by campbelp2002 7 · 0⤊ 0⤋
Braden your curiosity has me wondering what you plan to use this information for?
Did you know when god created the heavens and the earth when he "stared" into the dark night he thought it would be better to add "stars".This is why the word stareing and stars both contain star.*********************************************************************************************************************************************************** : )
2007-01-31 20:44:55 · answer #2 · answered by Anonymous · 0⤊ 3⤋