syrte
11/5/2017 - 2:25 AM

from https://en.wikipedia.org/wiki/Satellite_galaxy

Name,Diameter (kpc),Distance (kpc),Absolute magnitude,Type,Discovered
Large Magellanic Cloud,4,48.5,-18.1,SBm,-1
Small Magellanic Cloud,2,61,-16.8,Irr,-1
Sculptor Dwarf,0.8,90,-11.1,dE3,1937
Fornax Dwarf,0.6,140,-13.4,dE2,1938
Leo I,0.5,250,-12,dE3,1950
Leo II,0.7,210,-9.8,dE0,1950
Draco Dwarf,0.7,80,-8.8,dE0,1954
Ursa Minor Dwarf,0.4,60,-8.8,dE4,1954
Carina Dwarf Spheroidal,0.5,100,-9.1,dE3,1977
Sextans Dwarf Spheroidal,0.5,90,-9.3,dE3,1990
Sagittarius Dwarf,2.6,20,-13.5,E,1994
Canis Major Dwarf,1.5,8,,Irr,2003
Ursa Major I Dwarf,-,100,-5.5,dG D,2005
Bo_tes I,0.3,60,-6.3,dSph,2006
Canes Venatici I,2,220,-8.6,dSph,2006
Canes Venatici II,0.3,155,-4.9,dSph,2006
Coma Berenices,0.14,42,-4.1,dSph,2006
Hercules,0.7,135,-6.6,dSph,2006
Leo IV,0.3,160,-5.8,dSph,2006
Leo T,0.34,420,-8,dSph/dIrr,2006
Ursa Major II Dwarf,0.2,30,,dG D,2006
Bootes II,0.1,42,-2.7,dSph,2007
Leo V,0.08,180,-5.2,dSph,2007
Segue 1,0.06,23,-1.5,dSph,2007
Segue 2,0.07,35,-2.5,dSph,2007
Bo_tes III,1,46,,dSph?,2009
Pisces I,-,80,,dSph?,2009
Pisces II,0.12,180,-5,dSph,2010
Crater/Laevens I,0.06,145,,GC,2014
Cetus II,0.03,30,0,dSph?,2015
Columba I,0.21,182,-4.5,dSph,2015
Draco II,0.04,20,-2.9,dSph,2015
Eridanus II,0.55,366,-7.1,dSph,2015
Eridanus III,-,90,-2.4,dSph?,2015
Grus I,-,120,-3.4,dSph,2015
Grus II,0.19,53,-3.9,dSph,2015
Horologium I,-,100,-3.5,dSph?,2015
Horologium II,0.09,78,-2.6,dSph,2015
Hydra II,0.14,128,-4.8,dSph,2015
Indus II,0.36,214,-4.3,dSph?,2015
Kim 2/Indus I,-,100,,GC,2015
Pegasus III,0.11,215,-3.4,dSph,2015
Phoenix II,-,100,-3.7,dSph?,2015
Pictoris,-,115,-3.7,dSph?,2015
Reticulum II,-,30,-3.6,dSph,2015
Reticulum III,0.13,92,-3.3,dSph,2015
Sagittarius II,0.08,67,-5.2,dSph,2015
Triangulum II,0.07,30,-1.8,dSph,2015
Tucana II,-,70,-3.9,dSph,2015
Tucana III,0.09,25,-2.4,dSph,2015
Tucana IV,0.25,48,-3.5,dSph,2015
Tucana V,0.03,55,-1.6,dSph,2015
Aquarius II,0.32,108,-4.2,dSph,2016
Crater II,2.2,117.5,-8.2,dSph,2016
DES,-,82,,GC,2016
Virgo,0.09,91,-0.3,dSph?,2016
Cetus III,0.18,251,-2.4,dSph?,2017
from pylab import *
from handy import cdfsteps
from astropy.io import ascii

f = ascii.read('satellite.csv')
figure(figsize=(5, 4))
cdfsteps(f['Discovered'], normed=False)
grid(ls='--')
xlim(1930, 2020)
xlabel('Year')
ylabel('Cumulative Number')
savefig('sat_year.pdf')