A csillagászati magnitúdó skála.
az alábbi skála oktató eszközként szolgál, hogy általános képet adjon arról, hogyan működik a magnitúdó skála. Az alábbi skála nagyjából vizuális; az emberi szem (sötétre adaptált) érzékelési hatékonysága 495 nanométer körül tetőzik, míg a formális fotoelektromos v csúcs (a látáshoz közel álló szűrt sáv) 550 nm körül van; a CCD-k általában 700 nm körül tetőznek., A példa adott forinteger értékek nem a “pontos”, az égi objektumok areoften mérni, hogy egy precíziós vagy 0, 1, vagy 0.01 nagysága; például,Sirius süt V = -1.47 (Yale Fényes Csillag Katalógus),majd a Vénusz bolygó változik a fényerő, általában nagysága-4.5, hogy -3.7. Ne feledje, hogy az 5-ös nagyságrendű üstökös nem lesz olyan egyszerűlásd, mint egy 5-ös magnitúdójú csillag, mert ugyanannyi fényesség, amely a csillag egy pontján koncentrálódik, az égbolton szétszóródik egy viszonylag nagy kómával rendelkező diffúz üstökös számára.,
Magnitude Needed to see an object of this brightness* Examples -26 the sun -13 full moon -6 crescent moon -4 naked eye: easy even from large cities planet Venus -2 naked eye planet Jupiter -1 naked eye brightest star, Sirius; totally- eclipsed moon; C/1995 O1 (Hale- Bopp) near peak 0 naked eye: difficult if near bright summer evening star artificial lights but generally Vega; C/1996 B2 visible even from large cities (Hyakutake) at peak +1 naked eye: brilliant as seen from planet Saturn dark, rural areas +2 naked eye: difficult but visible from stars of Big Dipper small cities and suburbs; diffuse Halley's comet in objects such as comets may require 1986 near peak small binoculars from urban areas 3 naked eye: rural, suburban, small city faintest naked-eye binoculars: bright, urban areas stars visible from many smaller cities/inner suburbs; 4 naked eye: (outer) suburbs faintest naked-eye binoculars: cities (stars), suburban stars visible from areas (diffuse objects such as comets) many smaller cities/(outer) suburbs 5 generally binocular objects from urban moons of Jupiter and suburban areas; faintest naked-eye stars visible from "dark" rural areas located some 40 miles (60 km) from major cities 6 binocular objects from suburban areas; planet Uranus faintest naked-eye stars visible from "dark" rural areas located some 100 miles (150 km) from major cities 7 binoculars; faintest naked-eye stars brightest minor visible from "dark" rural areas planet (asteroid) located some 140 miles (200 km) from and about 1-2 major cities and some 30 miles (50 km) comets each year from nearest town of population 5000 or so 8 binocular objects; from urban areas, such planet Neptune objects may only be visible with small telescopes 10 from dark sky, objects visible with at any given 20x80 binoculars; from brighter sites, time, there are a larger telescope is needed usually a couple of comets this bright 11 general limiting visual brightness# of comets with a 15-cm-aperture reflector 12 general limiting visual brightness# of at any given time, comets with a 20-cm-aperture reflector there are usually a half dozen comets this bright 13 general limiting visual brightness# of comets with a 25-cm-aperture reflector 14 general limiting visual brightness# of Pluto at its brightest stars with a 20-cm-aperture reflector 15 general limiting visual brightness# of comets with a 50-cm-aperture reflector 19 general limiting photographic brightness# of comets with a 50-cm-aperture reflector 21 general limiting brightness of stars with a 60-cm-aperture reflector + CCD 22 general limiting brightness# of comets with a CCD and 150-cm-aperture reflector* naked-eye viewing assumes 20-20 vision (corrected or uncorrected)# from a dark, rural site; "visual" as compared to "photographic" or "CCD-detected"; "reflector" means "reflecting telescope"
ICQ