CSV

Stellar Spectral Classification - CSV

The Stellar Spectral Classification is a classification system developed by Annie Jump Cannon and colleagues at Harvard College Observatory between 1918 and 1924. It categorizes stars into ten types (O, B, A, F, G, K, M, L, T, Y) based on surface temperature, systematically organizing everything from the hottest blue giants to the coolest brown dwarfs. This classification was formally adopted by the precursor to the International Astronomical Union in 1922 and remains the standard classification system used worldwide in astronomy today.

astronomy stars spectral classification Harvard classification surface temperature brown dwarfs

code,slug,name,description,abundance_percent,color,example_stars,lifespan,mass_solar_max,mass_solar_min,mass_solar_typical,temperature_max_kelvin,temperature_min_kelvin,temperature_note,temperature_typical_kelvin,mass_jupiter_max,mass_jupiter_min,mass_jupiter_typical,object_type
O,o-type,O-type Star,The hottest and most massive blue giant stars.,<1,Blue,"[""Zeta Ophiuchi"",""Lambda Orionis"",""Theta1 Orionis C""]",5-6 million years,150,16,30,50000,28000,"Some subdwarfs can exceed 100,000K",,,,,
B,b-type,B-type Star,Hot blue-white massive stars.,0.13,Blue-white,"[""Rigel"",""Spica"",""Regulus""]",~300 million years,16,2.1,7,30000,10000,,15000,,,,
A,a-type,A-type Star,White stars with the strongest hydrogen lines.,0.625,White,"[""Sirius A"",""Vega"",""Altair"",""Fomalhaut""]",1-2 billion years,2.1,1.4,1.7,10000,7400,,8500,,,,
F,f-type,F-type Star,Yellow-white stars with intermediate temperature.,3,Yellow-white,"[""Procyon A"",""Polaris Aa"",""Canopus""]",4-8 billion years,1.4,1,1.2,7500,6000,,6700,,,,
G,g-type,G-type Star (Yellow Dwarf),Yellow main-sequence stars like our Sun.,7.5,Yellow,"[""Sun"",""Alpha Centauri A"",""Tau Ceti"",""51 Pegasi""]",~10 billion years (for solar mass),1.15,0.8,1,6000,5200,,5778,,,,
K,k-type,K-type Star (Orange Dwarf),Orange main-sequence stars cooler than the Sun.,12,Orange,"[""Epsilon Eridani"",""Alpha Centauri B"",""61 Cygni A""]",17-70 billion years,0.8,0.5,0.65,5200,3900,,4500,,,,
M,m-type,M-type Star (Red Dwarf),The most common and longest-lived red main-sequence stars.,75,Red,"[""Proxima Centauri"",""Barnard's Star"",""TRAPPIST-1"",""Wolf 359""]",1-10 trillion years,0.5,0.08,0.3,3900,2400,,3200,,,,
L,l-type,L-type Dwarf,Cool brown dwarfs with water and metal hydride absorption.,,Dark red,"[""2MASS J0523-1403"",""DENIS-P J1228.2-1547""]",,,,,2500,1300,,1900,65,13,30,Brown dwarf or cool star
T,t-type,T-type Dwarf,Cool brown dwarfs with methane absorption bands.,,Magenta/Black,"[""Gliese 570 D"",""WISE J0350-5658"",""2MASS J0559-1404""]",,,,,1500,600,,1000,80,13,50,Brown dwarf
Y,y-type,Y-type Dwarf,The coldest brown dwarfs with ammonia absorption features.,,Black (detectable only in infrared),"[""WISE J0855-0714"",""WISE J1828+2650"",""WISE J1738+2732""]",,,,,600,200,,400,80,13,50,Brown dwarf