ISP205 Lecture #20, March 22, 2001
Sun | -26.2 |
Venus (at its brightest) | -4.4 |
brightest star (Sirius A) | -1.5 |
faintest object visible with naked eye | 6 |
faintest object visible with binoculars | 10 |
faintest object visible with Hubble or Keck | 30 |
DEMO: Redshift
magnitude filter
Note: to get the stars luminosity one needs to
know
the distance (inverse square law)