program 30, output 3
absolute magnitude
astronomer gage av total enerjee a star put out
gotta no apparent magnitude & distans
Astronomers define absolute magnitude for lite emitters (stars)
as wot the apparent magnitude wood be if star was 10 parseks awae.
Apparent magnitude=how brite it look tu human ie on erth. See output 1.
Astronomers invented distans "parsek" from the wae em gaej star distans.
see output 2. 1 parsek=3.26116 lite yeers, 10 pars=32.6 lite yeers.
Yu gotta no distans & apparent magnitude tu get absolute magnitude.
Magnitude is a straenj skale astronomers invented. Sumwot like logs.
Mags alwaes kompare 2 lites. If briteness raesheo=100, mags differ bi 5.
But it is bakward...brite lite in smaller, very brite lite is negativ.
briteness=100^(-magnitude/5).
Zampel...neerest star=Alfa Centauri: apparent mag=-0.27.
distans=4.3650 lite yeers=1.3385 parsek=0.13385*(10 parsek).
Energy density drop as square av distans. So square 0.13385=0.0179153.
Alfa Senturi is less than 10 parseks awae, so its enerjee output is
less than the standard star at standard distans bi fakter=1/0.0179153.
distans fakter=55.8182. take log tu base 10 av 55.8182...=1.746776
Adjust magnitude bi 2.51*1.746776=4.367
add 4.367 tu (-0.27 apparent magnitude)
=4.1 This is the anser in astronomer speek.
Weer did that 2.51 kum from? 5 mags=100 times as brite.
So 1 mag is 100^(1/5)=100^ 0.2=2.5118864.
Distans tu stars is not very akkurut, so 3 digits is plenty.
Yu kan get logs on sientifik kalkulater or let puter yuze javascripts.
absolute mag is kin tu LUNINOSITY=total power a radiater put out.
waet...browser reed skript stuff
brite stars
name apparent distans absolute
magnitude lite yeers magnitude
Sirius -1.46 8.6 1.43
Canopus -0.72 74 -2.5
Alfa Centauri -0.27 4.36 4.1
Arcturus -0.04 34 0.2
Vega 0.03 25 0.59
Capella 0.08 41 0.4
Rigel 0.12 1400 -8.1
Procyon 0.38 11.4 2.6
Achernar 0.46 69 -1.3
Betelguse 0.50 1400 -7.2
Beta Centauri 0.61 320 -4.4
Acrux 0.76 510 -4.6
Altaer 0.77 16 2.3
Aldebaran 0.85 60 -0.3
Antares 0.96 520 -5.2
Spica 0.98 220 -3.2
Pollux 1.14 40 0.7
Formalhaut 1.16 22 2.0
Beta Cru 1.25 460 -4.7
Deneb 1.25 1500 -7.2
Regulus 1.35 69 -0.3
Adhara 1.50 570 -4.8
Caster 1.57 49 0.5
gamma Cru 1.63 120 -1.2
Shaula 1.63 330 -3.5
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Sun -26.73 0.000015812 4.8
full moon -12.6
krab supernova -6.73
Max Venus -4.7
Max Mars -3.0
Max Jupiter -2.6
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lite yu kan just barely see wen sun is up...-3.9
Sun-moon: 26.73-12.6=14.13 magnitude differ
14.13/5=2.826
100^2.826=448,745. Thus sun is 450,000 times as brite as full moon.