The Sun is the brightest star as viewed from Earth, at −26.78 mag. The second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of: the Moon −12.7 mag, Venus −4.92 mag, Jupiter −2.94 mag, Mars −2.94 mag, Mercury −2.48 mag, and Saturn −0.55 mag.
